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Sezai T, Murphy MJ, Riddell N, Nguyen V, Crewther SG. Visual Processing During the Interictal Period Between Migraines: A Meta-Analysis. Neuropsychol Rev 2023; 33:765-782. [PMID: 36115887 PMCID: PMC10770263 DOI: 10.1007/s11065-022-09562-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Accepted: 07/20/2022] [Indexed: 10/14/2022]
Abstract
Migraine is a poorly understood neurological disorder and a leading cause of disability in young adults, particularly women. Migraines are characterized by recurring episodes of severe pulsating unilateral headache and usually visual symptoms. Currently there is some disagreement in the electrophysiological literature regarding the universality of all migraineurs exhibiting physiological visual impairments also during interictal periods (i.e., the symptom free period between migraines). Thus, this meta-analysis investigated the evidence for altered visual function as measured electrophysiologically via pattern-reversal visual evoked potential (VEP) amplitudes and habituation in adult migraineurs with or without visual aura and controls in the interictal period. Twenty-three studies were selected for random effects meta-analysis which demonstrated slightly diminished VEP amplitudes in the early fast conducting P100 component but not in N135, and substantially reduced habituation in the P100 and the N135 in migraineurs with and without visual aura symptoms compared to controls. No statistical differences were found between migraineurs with and without aura, possibly due to inadequate studies. Overall, insufficient published data and substantial heterogeneity between studies was observed for all latency components of pattern-reversal VEP, highlighting the need for further electrophysiological experimentation and more targeted temporal analysis of visual function, in episodic migraineurs.
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Affiliation(s)
- Timucin Sezai
- Department of Psychology and Counselling, School of Psychology and Public Health, La Trobe University, Melbourne, VIC, 3086, Australia
| | - Melanie J Murphy
- Department of Psychology and Counselling, School of Psychology and Public Health, La Trobe University, Melbourne, VIC, 3086, Australia
| | - Nina Riddell
- Department of Psychology and Counselling, School of Psychology and Public Health, La Trobe University, Melbourne, VIC, 3086, Australia
| | - Vinh Nguyen
- Department of Psychology and Counselling, School of Psychology and Public Health, La Trobe University, Melbourne, VIC, 3086, Australia
| | - Sheila G Crewther
- Department of Psychology and Counselling, School of Psychology and Public Health, La Trobe University, Melbourne, VIC, 3086, Australia.
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O'Hare L, Tarasi L, Asher JM, Hibbard PB, Romei V. Excitation-Inhibition Imbalance in Migraine: From Neurotransmitters to Brain Oscillations. Int J Mol Sci 2023; 24:10093. [PMID: 37373244 DOI: 10.3390/ijms241210093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 06/07/2023] [Accepted: 06/08/2023] [Indexed: 06/29/2023] Open
Abstract
Migraine is among the most common and debilitating neurological disorders typically affecting people of working age. It is characterised by a unilateral, pulsating headache often associated with severe pain. Despite the intensive research, there is still little understanding of the pathophysiology of migraine. At the electrophysiological level, altered oscillatory parameters have been reported within the alpha and gamma bands. At the molecular level, altered glutamate and GABA concentrations have been reported. However, there has been little cross-talk between these lines of research. Thus, the relationship between oscillatory activity and neurotransmitter concentrations remains to be empirically traced. Importantly, how these indices link back to altered sensory processing has to be clearly established as yet. Accordingly, pharmacologic treatments have been mostly symptom-based, and yet sometimes proving ineffective in resolving pain or related issues. This review provides an integrative theoretical framework of excitation-inhibition imbalance for the understanding of current evidence and to address outstanding questions concerning the pathophysiology of migraine. We propose the use of computational modelling for the rigorous formulation of testable hypotheses on mechanisms of homeostatic imbalance and for the development of mechanism-based pharmacological treatments and neurostimulation interventions.
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Affiliation(s)
- Louise O'Hare
- Division of Psychology, Nottingham Trent University, Nottingham NG1 4FQ, UK
| | - Luca Tarasi
- Centro Studi e Ricerche in Neuroscienze Cognitive, Dipartimento di Psicologia, Alma Mater Studiorum-Università di Bologna, Campus di Cesena, Via Rasi e Spinelli, 176, 47521 Cesena, Italy
| | - Jordi M Asher
- Department of Psychology, University of Essex, Colchester CO4 3SQ, UK
| | - Paul B Hibbard
- Department of Psychology, University of Essex, Colchester CO4 3SQ, UK
| | - Vincenzo Romei
- Centro Studi e Ricerche in Neuroscienze Cognitive, Dipartimento di Psicologia, Alma Mater Studiorum-Università di Bologna, Campus di Cesena, Via Rasi e Spinelli, 176, 47521 Cesena, Italy
- Facultad de Lenguas y Educación, Universidad Antonio de Nebrija, 28015 Madrid, Spain
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3
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Chen ST, Su KC, Wang PH, Zhong XY, Cheng CY. Routine binocular examination of young Taiwanese adults as a predictor of visual behavior performance. BMC Ophthalmol 2023; 23:47. [PMID: 36726067 PMCID: PMC9890884 DOI: 10.1186/s12886-022-02731-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Accepted: 12/09/2022] [Indexed: 02/03/2023] Open
Abstract
BACKGROUND Morgan and Scheiman's Optometric Extension Program (OEP) expected binocular vision findings have longstanding use in optometry. With technological advances, the demands and standards of binocular function have changed. This study aimed to investigate which binocular visual functions can effectively predict visual behavior performance. METHODS Participants aged 15-24 years were recruited from two colleges and two universities. After completing the CSMU-Visual Behavioral Performance questionnaire (CSMU-VBP, with four components: near work, visual perception, visual comfort, and whole-body balance), participants were divided into symptomatic and asymptomatic groups based on questionnaire findings (cutoff: < 12 vs. ≥ 12 symptoms). Then a 24-step binocular visual examination was undertaken. Data were analyzed with one-sample, Student's, and paired t-tests. Additionally, receiver operating characteristic analysis was used to determine the predictors of binocular visual function required for near work, visual perception, visual comfort, and body balance dimensions. RESULTS Among 308 participants, 43 (14%) and 265 (86%) were symptomatic and asymptomatic, respectively. Among the 46 participants with abnormal binocular vision, 36 (78%) reported that they had no obvious symptoms. The commonest dysfunctions were accommodative excess and convergence excess. Most of the binocular visual findings significantly diverged from traditional normal values: amplitude of accommodation, as well as base-in prism to break and recovery points at distance were higher than traditional normal values, whereas others were lower than traditional normal values. Total CSMU-VBP scores indicated that the asymptomatic and symptomatic groups had significant differences in DBO recovery (t = 2.334, p = 0.020) and BAF (t = 1.984, p = 0.048). Receiver operating characteristic curve analysis yielded the following binocular visual functional cutoff points: near work (DBO blur < 7, DBO recovery < 5.5), visual perception (MAF < 10.5, BAF < 10.25), visual comfort (DLP < - 2.25, DBI break > 11.5, NBI blur > 15, NBI break > 17.5, NBI recovery > 13, NPC < 5.75), and body balance (NFD_H > - 0.5, gradient AC/A [minus] > 2.25, NPC < 4.75). CONCLUSIONS The mean values of binocular visual function among young Taiwanese adults were statistically different from traditional normative values. Further research is required to confirm whether these findings reflect impaired binocular vision or stringent criteria. Assessments of binocular visual function, especially binocular accommodation sensitivity, are crucial in routine optometric examination.
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Affiliation(s)
- Shyan-Tarng Chen
- grid.411641.70000 0004 0532 2041Department of Optometry, Chung Shan Medical University, Taichung, 402 Taiwan ,grid.411645.30000 0004 0638 9256Department of Ophthalmology, Chung Shan Medical University Hospital, Taichung, 402 Taiwan
| | - Kuo-Chen Su
- grid.411641.70000 0004 0532 2041Department of Optometry, Chung Shan Medical University, Taichung, 402 Taiwan ,grid.411645.30000 0004 0638 9256Department of Ophthalmology, Chung Shan Medical University Hospital, Taichung, 402 Taiwan
| | - Po-Hsin Wang
- grid.411641.70000 0004 0532 2041Department of Optometry, Chung Shan Medical University, Taichung, 402 Taiwan
| | - Xiang-Yin Zhong
- grid.411641.70000 0004 0532 2041Department of Optometry, Chung Shan Medical University, Taichung, 402 Taiwan
| | - Ching-Ying Cheng
- grid.411641.70000 0004 0532 2041Department of Optometry, Chung Shan Medical University, Taichung, 402 Taiwan ,grid.411645.30000 0004 0638 9256Department of Ophthalmology, Chung Shan Medical University Hospital, Taichung, 402 Taiwan
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4
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Torrens WA, Pablo JN, Shires J, Haigh SM, Berryhill ME. People with high schizotypy experience more illusions in the Pattern Glare Test: Consistent with the hyperexcitability hypothesis. Eur J Neurosci 2023; 57:388-399. [PMID: 36484768 PMCID: PMC9847329 DOI: 10.1111/ejn.15886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Accepted: 11/30/2022] [Indexed: 12/14/2022]
Abstract
Individuals diagnosed with schizophrenia spectrum disorders (SSD) exhibit a constellation of sensory and perceptual impairments, including hyporeactivity to external input. However, individuals with SSD also report subjective experiences of sensory flooding, suggesting sensory hyperexcitability. To identify the extent to which behavioural indices of hyperexcitability are related to non-psychotic symptoms of schizophrenia, we tested a non-clinical population measured for schizophrenia-like traits (schizotypy), and a behavioural measure of sensory hyperexcitability, specifically the number of illusions seen in the Pattern Glare Test. Two samples totaling 913 individuals completed an online version of the Schizotypal Personality Questionnaire - Brief Revised (SPQ-BR) and the Pattern Glare Test. Individuals with higher schizotypy traits reported more illusions in the Pattern Glare Test. Additionally, one of the three SPQ-BR factors, the disorganized factor, significantly predicted the number of illusions reported. These data illustrate the potential for research in non-clinical samples to inform clinically relevant research.
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Affiliation(s)
- Wendy A Torrens
- Department of Psychology, University of Nevada, Reno, Reno, Nevada, USA
| | - Jenna N Pablo
- Department of Psychology, University of Nevada, Reno, Reno, Nevada, USA
| | - Jorja Shires
- Department of Psychology, University of Nevada, Reno, Reno, Nevada, USA
| | - Sarah M Haigh
- Department of Psychology, University of Nevada, Reno, Reno, Nevada, USA
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Hanalioglu S, Taskiran-Sag A, Karatas H, Donmez-Demir B, Yilmaz-Ozcan S, Eren-Kocak E, Gursoy-Ozdemir Y, Dalkara T. Cortical spreading depression can be triggered by sensory stimulation in primed wild type mouse brain: a mechanistic insight to migraine aura generation. J Headache Pain 2022; 23:107. [PMID: 35986251 PMCID: PMC9392331 DOI: 10.1186/s10194-022-01474-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Accepted: 08/09/2022] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Unlike the spontaneously appearing aura in migraineurs, experimentally, cortical spreading depression (CSD), the neurophysiological correlate of aura is induced by non-physiological stimuli. Consequently, neural mechanisms involved in spontaneous CSD generation, which may provide insight into how migraine starts in an otherwise healthy brain, remain largely unclear. We hypothesized that CSD can be physiologically induced by sensory stimulation in primed mouse brain.
Methods
Cortex was made susceptible to CSD with partial inhibition of Na+/K+-ATPase by epidural application of a low concentration of Na+/K+-ATPase blocker ouabain, allowing longer than 30-min intervals between CSDs or by knocking-down α2 subunit of Na+/K+-ATPase, which is crucial for K+ and glutamate re-uptake, with shRNA. Stimulation-triggered CSDs and extracellular K+ changes were monitored in vivo electrophysiologically and a K+-sensitive fluoroprobe (IPG-4), respectively.
Results
After priming with ouabain, photic stimulation significantly increased the CSD incidence compared with non-stimulated animals (44.0 vs. 4.9%, p < 0.001). Whisker stimulation also significantly increased the CSD incidence, albeit less effectively (14.9 vs. 2.4%, p = 0.02). Knocking-down Na+/K+-ATPase (50% decrease in mRNA) lowered the CSD threshold in all mice tested with KCl but triggered CSDs in 14.3% and 16.7% of mice with photic and whisker stimulation, respectively. Confirming Na+/K+-ATPase hypofunction, extracellular K+ significantly rose during sensory stimulation after ouabain or shRNA treatment unlike controls. In line with the higher CSD susceptibility observed, K+ rise was more prominent after ouabain. To gain insight to preventive mechanisms reducing the probability of stimulus-evoked CSDs, we applied an A1-receptor antagonist (DPCPX) to the occipital cortex, because adenosine formed during stimulation from ATP can reduce CSD susceptibility. DPCPX induced spontaneous CSDs but only small-DC shifts along with suppression of EEG spikes during photic stimulation, suggesting that the inhibition co-activated with sensory stimulation could limit CSD ignition when K+ uptake was not sufficiently suppressed as with ouabain.
Conclusions
Normal brain is well protected against CSD generation. For CSD to be ignited under physiological conditions, priming and predisposing factors are required as seen in migraine patients. Intense sensory stimulation has potential to trigger CSD when co-existing conditions bring extracellular K+ and glutamate concentrations over CSD-ignition threshold and stimulation-evoked inhibitory mechanisms are overcome.
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6
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Ten Brink AF, Bultitude JH. Visual Sensitivity in Complex Regional Pain Syndrome and Fibromyalgia: An Online Study. Perception 2022; 51:187-209. [PMID: 35236184 PMCID: PMC8958570 DOI: 10.1177/03010066211072641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Perceptual anomalies can provide insights into underlying pathologies even when they are not the main symptom of many clinical conditions. Complex regional pain syndrome (CRPS) and fibromyalgia are chronic pain conditions associated with changes in the central nervous system, possibly leading to enhanced visual sensitivity. It is unclear whether this occurs more than for people with other types of pain. We examined visual sensitivity elicited by different stimuli and in daily life, through an online study of people with CRPS (n = 57), fibromyalgia (n = 74), other pain (n = 50), and no pain (n = 89). Respondents rated changes in pain, discomfort, or distress from viewing patterns with different spatial frequencies (lower-order visual processing), and reversible figures (bistable images; higher-order visual processing). We assessed visual sensitivity in daily life using the Leiden Visual Sensitivity Scale and Visual Discomfort Scale. Respondents with CRPS or fibromyalgia reported more visual discomfort than pain-related and pain-free controls while viewing striped patterns and a circle, with no effect of spatial frequency. They reported more pain while viewing a nonreversible square, but not reversible figures (Necker Cube, Duck/Rabbit). Finally, they reported more daily visual sensitivity than pain-related and pain-free controls. Suppressing visual cortical activity might benefit people with CRPS or fibromyalgia.
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7
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Powell G, Penacchio O, Derry-Sumner H, Rushton SK, Rajenderkumar D, Sumner P. Visual stress responses to static images are associated with symptoms of Persistent Postural Perceptual Dizziness (PPPD). J Vestib Res 2022; 32:69-78. [PMID: 34151873 DOI: 10.3233/ves-190578] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Images that deviate from natural scene statistics in terms of spatial frequency and orientation content can produce visual stress (also known as visual discomfort), especially for migraine sufferers. These images appear to over-activate the visual cortex. OBJECTIVE To connect the literature on visual discomfort with a common chronic condition presenting in neuro-otology clinics known as persistent postural perceptual dizziness (PPPD). Patients experience dizziness when walking through highly cluttered environments or when watching moving stimuli. This is thought to arise from maladaptive interaction between vestibular and visual signals for balance. METHODS We measured visual discomfort to stationary images in patients with PPPD (N = 30) and symptoms of PPPD in a large general population cohort (N = 1858) using the Visual Vertigo Analogue Scale (VVAS) and the Situational Characteristics Questionnaire (SCQ). RESULTS We found that patients with PPPD, and individuals in the general population with more PPPD symptoms, report heightened visual discomfort to stationary images that deviate from natural spectra (patient comparison, F (1, 1865) = 29, p < 0.001; general population correlations, VVAS, rs (1387) = 0.46, p < 0.001; SCQ, rs (1387) = 0.39, p < 0.001). These findings were not explained by co-morbid migraine. Indeed, PPPD symptoms showed a significantly stronger relationship with visual discomfort than did migraine (VVAS, zH = 8.81, p < 0.001; SCQ, zH = 6.29, p < 0.001). CONCLUSIONS We speculate that atypical visual processing -perhaps due to a visual cortex more prone to over-activation -may predispose individuals to PPPD, possibly helping to explain why some patients with vestibular conditions develop PPPD and some do not.
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Affiliation(s)
- Georgina Powell
- School of Psychology, Cardiff University, Tower building, Park Place, Cardiff, UK
| | - Olivier Penacchio
- School of Psychology and Neuroscience, University of St Andrews, St Andrews, UK
| | - Hannah Derry-Sumner
- Department of Audiovestibular Medicine, University Hospital of Wales, Cardiff, UK
| | - Simon K Rushton
- School of Psychology, Cardiff University, Tower building, Park Place, Cardiff, UK
| | - Deepak Rajenderkumar
- Department of Audiovestibular Medicine, University Hospital of Wales, Cardiff, UK
| | - Petroc Sumner
- School of Psychology, Cardiff University, Tower building, Park Place, Cardiff, UK
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8
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Hine TJ, White YBZ. Pattern-Induced Visual Discomfort and Anxiety in Migraineurs: Their Relationship and the Effect of Colour. Vision (Basel) 2021; 6:vision6010001. [PMID: 35076617 PMCID: PMC8788433 DOI: 10.3390/vision6010001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2021] [Revised: 12/13/2021] [Accepted: 12/21/2021] [Indexed: 12/02/2022] Open
Abstract
In migraineurs, coloured lenses were found to reduce the visual stress caused by an aversive pattern known to trigger migraines by 70%, but do such patterns also produce a low-level anxiety/fear response? Is this response lessened by colour? We sought to investigate this in a study comprising a broad screening component followed by a dot-probe experiment to elicit attentional biases (AB) to aversive patterns. Undergraduate psychology students completed headache and visual discomfort (VD) questionnaires (N = 358), thereby forming a subject pool from which 13 migraineurs with high visual discomfort and 13 no-headache controls with low visual discomfort, matched on age and sex, completed a dot-probe experiment. Paired stimuli were presented for 500 ms: aversive achromatic 3 cpd square wave gratings vs control, scrambled patterns. These conditions were repeated using the colour that was most comfortable for each participant. VD was greater in the more severe headache groups. On all measures, the migraineurs were more anxious than the controls, and a positive relationship was found between VD and trait anxiety. The 3 cpd gratings elicited an aversive AB in the migraine group which was somewhat reduced by the use of colour, and this was not seen in the controls. The results suggest a new role for colour in reducing visual stress via anxiety/fear reduction.
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9
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The Functional Network of the Visual Cortex Is Altered in Migraine. Vision (Basel) 2021; 5:vision5040057. [PMID: 34842839 PMCID: PMC8628991 DOI: 10.3390/vision5040057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 11/12/2021] [Accepted: 11/15/2021] [Indexed: 11/17/2022] Open
Abstract
Migraine is a common neurological disorder characterized by recurrent episodes of headache, frequently accompanied by various reversible neurological disturbances. Some migraine patients experience visually triggered migraine headache, and most attacks of migraine with aura are associated with the disturbance of vision and photophobia, suggesting an abnormal neural activity in the visual cortex. Numerous studies have shown a large cortical hemodynamic response to visual stimulation and an altered intrinsic visual functional connectivity network in patients with migraine. In this interictal study, we applied a novel data-driven method with fMRI to identify the functional network in the visual cortex evoked by visual stimulation and investigated the effect of migraine on this network. We found that the distribution of the functional network along both the ventral and dorsal visual pathways differed between migraine patients and non-headache healthy control participants, providing evidence that the functional network was altered in migraine between headaches. The functional network was bilateral in the control participants but substantially lateralized in the migraine patients. The results also indicated different effects of colored lenses on the functional network for both participant groups.
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10
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O'Hare L, Goodwin P, Sharp A, Contillo A, Pavan A. Improvement in visual perception after high-frequency transcranial random noise stimulation (hf-tRNS) in those with migraine: An equivalent noise approach. Neuropsychologia 2021; 161:107990. [PMID: 34403655 DOI: 10.1016/j.neuropsychologia.2021.107990] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2020] [Revised: 07/14/2021] [Accepted: 08/10/2021] [Indexed: 12/17/2022]
Abstract
Migraine is a common neurological disorder with strong links to vision. Interictal migraine is thought to be characterised by internal noise in the brain, possibly due to increased variability in neural firing, which can be estimated using equivalent noise tasks. High-frequency transcranial random noise stimulation (hf-tRNS) can be used to modulate levels of internal noise in the brain, and so presents a possible therapy to redress noise levels in the migraine brain. This is a case-control study using a 2-alternative forced choice (2AFC) design. Hf-tRNS and Sham control stimulation were used alongside a global motion direction discrimination task and visually based equivalent noise tasks. The migraine group demonstrated increased baseline internal noise levels compared to the control group. Internal noise levels, and sampling, were reduced using hf-tRNS but not Sham stimulation. However, there were no differences in terms of coherence thresholds, slopes, and lapse rate for global motion discrimination between the two groups. This is the first demonstration of the possibility of decreasing internal noise levels in migraine using hf-tRNS. Future work could explore the possibility of neurostimulation as a therapy for migraine.
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Affiliation(s)
- Louise O'Hare
- University of Lincoln, School of Psychology, Brayford Wharf East, Lincoln, LN5 7AY, United Kingdom; Nottingham Trent University, Department of Psychology, 50 Shakespeare Street, Nottingham, NG1 4FQ, United Kingdom. louise.o'
| | - Peter Goodwin
- University of Lincoln, School of Psychology, Brayford Wharf East, Lincoln, LN5 7AY, United Kingdom; Nottingham Trent University, Department of Psychology, 50 Shakespeare Street, Nottingham, NG1 4FQ, United Kingdom
| | - Alex Sharp
- University of Lincoln, School of Psychology, Brayford Wharf East, Lincoln, LN5 7AY, United Kingdom
| | | | - Andrea Pavan
- University of Lincoln, School of Psychology, Brayford Wharf East, Lincoln, LN5 7AY, United Kingdom; University of Bologna, Department of Psychology, Viale Berti Pichat, 5, 40127, Bologna, Italy
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11
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Tempesta AJ, Miller CE, Litvak V, Bowman H, Schofield AJ. The missing N1 or jittered P2: Electrophysiological correlates of pattern glare in the time and frequency domain. Eur J Neurosci 2021; 54:6168-6186. [PMID: 34374142 PMCID: PMC9290835 DOI: 10.1111/ejn.15419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 07/16/2021] [Accepted: 07/29/2021] [Indexed: 12/04/2022]
Abstract
Excessive sensitivity to certain visual stimuli (cortical hyperexcitability) is associated with a number of neurological disorders including migraine, epilepsy, multiple sclerosis, autism and possibly dyslexia. Others show disruptive sensitivity to visual stimuli with no other obvious pathology or symptom profile (visual stress) which can extend to discomfort and nausea. We used event‐related potentials (ERPs) to explore the neural correlates of visual stress and headache proneness. We analysed ERPs in response to thick (0.37 cycles per degree [c/deg]), medium (3 c/deg) and thin (12 c/deg) gratings, using mass univariate analysis, considering three factors in the general population: headache proneness, visual stress and discomfort. We found relationships between ERP features and the headache and discomfort factors. Stimulus main effects were driven by the medium stimulus regardless of participant characteristics. Participants with high discomfort ratings had larger P1 components for the initial presentation of medium stimuli, suggesting initial cortical hyperexcitability that is later suppressed. The participants with high headache ratings showed atypical N1‐P2 components for medium stripes relative to the other stimuli. This effect was present only after repeated stimulus presentation. These effects were also explored in the frequency domain, suggesting variations in intertrial theta band phase coherence. Our results suggest that discomfort and headache in response to striped stimuli are related to different neural processes; however, more exploration is needed to determine whether the results translate to a clinical migraine population.
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Affiliation(s)
- Austyn J Tempesta
- School of Psychology, College of Life and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, UK
| | - Claire E Miller
- School of Psychology, College of Life and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, UK
| | - Vladimir Litvak
- Wellcome Centre for Human Neuroimaging, University College London, London, UK
| | - Howard Bowman
- School of Psychology, College of Life and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, UK.,School of Computing, University of Kent, Canterbury, UK
| | - Andrew J Schofield
- School of Psychology, College of Life and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, UK.,School of Psychology, College of Health and Life Sciences, Aston University, Birmingham, UK
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12
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Visual Perception in Migraine: A Narrative Review. Vision (Basel) 2021; 5:vision5020020. [PMID: 33924855 PMCID: PMC8167726 DOI: 10.3390/vision5020020] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 04/20/2021] [Accepted: 04/20/2021] [Indexed: 11/25/2022] Open
Abstract
Migraine, the most frequent neurological ailment, affects visual processing during and between attacks. Most visual disturbances associated with migraine can be explained by increased neural hyperexcitability, as suggested by clinical, physiological and neuroimaging evidence. Here, we review how simple (e.g., patterns, color) visual functions can be affected in patients with migraine, describe the different complex manifestations of the so-called Alice in Wonderland Syndrome, and discuss how visual stimuli can trigger migraine attacks. We also reinforce the importance of a thorough, proactive examination of visual function in people with migraine.
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Pöhlmann KMT, O’Hare L, Dickinson P, Parke A, Föcker J. Action Video Game Players Do Not Differ in the Perception of Contrast-Based Motion Illusions but Experience More Vection and Less Discomfort in a Virtual Environment Compared to Non-Action Video Game Players. JOURNAL OF COGNITIVE ENHANCEMENT 2021. [DOI: 10.1007/s41465-021-00215-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
AbstractAction video game players (AVGPs) show enhanced visual perceptual functions compared to their non-video game playing peers (NVGPs). Whether AVGPs are more susceptible towards static contrast motion illusions, such as Fraser Wilcox illusions, has not been addressed so far. Based on their improved perceptual skills, AVGPs are expected to be more susceptible to the illusions and perceive more motion in them. The experience of illusory self-motion (vection) is believed to be dependent on top-down attentional processes; AVGPs should therefore experience stronger vection compared to NVGPs based on their improved attentional skills. Lastly, due to their extensive prior experience with virtual environments, AVGPs should experience less discomfort in VR compared to NVGPs. We presented rotating and expanding motion illusions in a virtual environment and asked 22 AVGPs and 21 NVGPs to indicate the strength of illusory motion, as well as the level of discomfort and vection experienced when exposed to these motion illusions. Results indicated that AVGPs and NVGPs perceived the same amount of motion when viewing these illusions. However, AVGPs perceived more vection and less discomfort compared to NVGPs, possibly due to factors such as enhanced top-down attentional control and adaptation. No differences in the perception of expanding and rotating illusions were found. Discomfort experienced by AVGPs was related to illusion strength, suggesting that contrast illusions might evoke the perceived discomfort rather than the virtual environment. Further studies are required to investigate the relationship between contrast sensitivity, migraine and the perception of illusion in AVGPs which should include illusory motion onset and duration measures.
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Monger LJ, Shah D, Wilkins AJ, Allen PM. The effect of viewing distance on responses to the pattern glare test. Clin Exp Optom 2021; 99:47-50. [DOI: 10.1111/cxo.12364] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Revised: 04/01/2015] [Accepted: 04/06/2015] [Indexed: 11/27/2022] Open
Affiliation(s)
- Laura J Monger
- Department of Vision and Hearing Sciences and Vision and Eye Research Unit, Anglia Ruskin University, Cambridge, UK,
| | - Dhruvi Shah
- Department of Vision and Hearing Sciences and Vision and Eye Research Unit, Anglia Ruskin University, Cambridge, UK,
| | - Arnold J Wilkins
- Department of Psychology, University of Essex, Wivenhoe Park, Colchester, UK,
| | - Peter M Allen
- Department of Vision and Hearing Sciences and Vision and Eye Research Unit, Anglia Ruskin University, Cambridge, UK,
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15
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Ten Brink AF, Proulx MJ, Bultitude JH. Validation of the Leiden Visual Sensitivity Scale and Visual Discomfort Scale in Chronic Pain Conditions. Perception 2021; 50:399-417. [PMID: 33789541 DOI: 10.1177/03010066211005327] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Discomfort provoked by normally innocuous visual stimuli has been reported by people with chronic pain. Visual discomfort may be higher in pain conditions in which central sensitization is implicated, such as Complex Regional Pain Syndrome (CRPS) and fibromyalgia. In an online study, we validated the Leiden Visual Sensitivity Scale (L-VISS) and Visual Discomfort Scale (VDS) in people with CRPS (n = 57), fibromyalgia (n = 75), and general chronic pain (n = 53); investigated whether these groups and pain-free controls (n = 125) differed in visual discomfort; and evaluated the effect of age. The L-VISS and VDS had good internal consistency. Both scales were positively related with experimentally induced visual distortions for mid-spatial frequency striped patterns, suggesting good construct validity. The scales were positively related with each other, and dissociated between the pain and pain-free groups in similar ways, suggesting good construct validity. There was no relationship between age and L-VISS scores and a small negative relationship between age and VDS scores. Visual discomfort was highest in the fibromyalgia group, followed by the CRPS group. This research confirms the utility of the L-VISS and VDS for measuring visual sensitivity in chronic pain and adds to evidence that central sensitization is an important mechanism of visual discomfort.
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Affiliation(s)
- Antonia F Ten Brink
- Department of Psychology, 1555University of Bath, UK; Centre for Pain Research, University of Bath, UK.,Department of Psychology, 1555University of Bath, UK; Centre for Pain Research, University of Bath, UK
| | - Michael J Proulx
- Department of Psychology, 1555University of Bath, UK; Department of Computer Science, Centre for Real and Virtual Environments Augmentation Labs, University of Bath, UK.,Department of Psychology, 1555University of Bath, UK; Centre for Pain Research, University of Bath, UK
| | - Janet H Bultitude
- Department of Psychology, 1555University of Bath, UK; Centre for Pain Research, University of Bath, UK
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16
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Karvounides D, Marzouk M, Ross AC, VanderPluym JH, Pettet C, Ladak A, Ziplow J, Patterson Gentile C, Turner S, Anto M, Barmherzig R, Chadehumbe M, Kalkbrenner J, Malavolta CP, Clementi MA, Gerson T, Szperka CL. The intersection of COVID-19, school, and headaches: Problems and solutions. Headache 2021; 61:190-201. [PMID: 33382459 PMCID: PMC8086994 DOI: 10.1111/head.14038] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 10/12/2020] [Accepted: 11/12/2020] [Indexed: 12/21/2022]
Abstract
OBJECTIVE To equip clinicians with recommendations specific to concerns related to the novel coronavirus disease 2019 (COVID-19), which impact the physical, emotional, and social health of youth with headache disorders. BACKGROUND COVID-19 has affected societies on a global scale including children and youth with chronic headache disorders. Many concerns are predicted to arise in the 2020-2021 school year, whether classes are conducted in-person or virtually. METHODS Clinical impressions were combined with a review of the literature, although limited due to the recent nature of this issue. RESULTS We describe recommendations to support caregivers and youth as they face changes expected with the return to school in the fall of 2020. CONCLUSION Although there are significant concerns for caregivers and youth with migraine given the context of changes related to the pandemic, there are many recommendations that can help minimize exacerbations of the physical, emotional, and social health of youth with chronic migraine.
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Affiliation(s)
- Dina Karvounides
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Maya Marzouk
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
- Ferkauf Graduate School of Psychology, Yeshiva University, New York, NY, USA
| | - Alexandra C Ross
- UCSF Benioff Children's Hospital, University of California, San Francisco, CA, USA
| | | | | | - Ali Ladak
- Penn Therapy & Fitness, University City, Philadelphia, PA, USA
| | - Jason Ziplow
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Carlyn Patterson Gentile
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
- Department of Neurology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
| | - Scott Turner
- Department of Neurology, University of Alabama at Birmingham, School of Medicine, Birmingham, AL, USA
| | - Marissa Anto
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Rebecca Barmherzig
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Madeline Chadehumbe
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
- Department of Neurology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
| | - Jocelyn Kalkbrenner
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Carrie P Malavolta
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Michelle A Clementi
- Department of Psychiatry, University of Colorado Anschutz Medical Campus and Children's Hospital Colorado, Aurora, CO, USA
- Department of Pediatrics, University of Colorado Anschutz Medical Campus and Children's Hospital Colorado, Aurora, CO, USA
| | - Trevor Gerson
- Division of Child Neurology, Children's Mercy Hospital, University of Missouri-Kansas City School of Medicine, Kansas City, MO, USA
| | - Christina L Szperka
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
- Department of Neurology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
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17
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Dickson G, Burtan D, James S, Phillips D, Stevanov J, Heard P, Leonards U. Walking on Visual Illusions. Iperception 2021; 12:2041669520981101. [PMID: 33680419 PMCID: PMC7900843 DOI: 10.1177/2041669520981101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Accepted: 11/25/2020] [Indexed: 11/17/2022] Open
Abstract
In nature, sensory and physical characteristics of the environment tend to match; for example, a surface that looks bumpy is bumpy. In human-built environments, they often don't. Here, we report observations from people exploring if mismatch between visual and physical characteristics affected their perceived walking experience. Participants walked across four flat floors, each comprising of a visual illusion: two patterns perceived as alternating 3D "furrows and ridges," the Primrose Field illusion, and a variant of the Cafe Wall illusion as a control pattern without perceived 3D effects. Participants found all patterns intriguing to look at; some describing them as "playful" or "gentle." More than half found some of the patterns uncomfortable to walk on, aversive, affecting walking stability, and occasionally even evoking fear of falling. These experiences raise crucial research questions for the vision sciences into the impact of architectural design on well-being and walkability.
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Affiliation(s)
| | - Daria Burtan
- School of Psychological Science, University of Bristol, Bristol, United Kingdom
| | - Shelley James
- School of Fine Art, Royal College of Art, London, United Kingdom
| | | | - Jasmina Stevanov
- School of Psychological Science, University of Bristol, Bristol, United Kingdom
| | - Priscilla Heard
- School of Psychology, University of the West of England, Bristol, United Kingdom
| | - Ute Leonards
- School of Psychological Science, University of Bristol, Bristol, United Kingdom
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18
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He C, Nguyen BN, Chan YM, McKendrick AM. Illusory Motion Perception Is Associated with Contrast Discrimination but Not Motion Sensitivity, Self-Reported Visual Discomfort, or Migraine Status. Invest Ophthalmol Vis Sci 2020; 61:43. [PMID: 32725212 PMCID: PMC7425739 DOI: 10.1167/iovs.61.8.43] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Purpose Altered visual processing of motion and contrast has been previously reported in people with migraine. One possible manifestation of this altered visual processing is increased self-reported susceptibility to visual illusions of contrast and motion. Here, we use the Fraser–Wilcox illusion to explore individual differences in motion illusion strength in people with and without migraine. The motion-inducing mechanisms of the Fraser–Wilcox illusion are purported to be contrast dependent. To better understand the mechanisms of the illusion, as well as visual processing anomalies in migraine, we explored whether migraine status, susceptibility to visual discomfort, contrast discrimination, or motion sensitivity are related to quantified motion illusion strength. Methods Thirty-six (16 with aura, 20 without aura) people with migraine and 20 headache-free controls participated. Outcome measures were motion illusion strength (the physical motion speed that counterbalanced the illusory motion), motion sensitivity, and contrast discrimination thresholds (measured for each contrast pair that formed part of the illusory motion stimulus). Typical daily visual discomfort was self-reported via questionnaire. Results Motion illusion strength was negatively correlated with contrast discrimination threshold (r = –0.271, P = 0.04) but was not associated with motion sensitivity or migraine status. People with migraine with aura reported experiencing visual discomfort more frequently than the control group (P = 0.001). Self-reported visual discomfort did not relate to quantified perceptual motion illusion strength. Conclusions Individuals with better contrast discrimination tend to perceive faster illusory motion regardless of migraine status.
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19
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The visual system as target of non-invasive brain stimulation for migraine treatment: Current insights and future challenges. PROGRESS IN BRAIN RESEARCH 2020. [PMID: 33008507 DOI: 10.1016/bs.pbr.2020.05.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
The visual network is crucially implicated in the pathophysiology of migraine. Several lines of evidence indicate that migraine is characterized by an altered visual cortex excitability both during and between attacks. Visual symptoms, the most common clinical manifestation of migraine aura, are likely the result of cortical spreading depression originating from the extrastriate area V3A. Photophobia, a clinical hallmark of migraine, is linked to an abnormal sensory processing of the thalamus which is converged with the non-image forming visual pathway. Finally, visual snow is an increasingly recognized persistent visual phenomenon in migraine, possibly caused by increased perception of subthreshold visual stimuli. Emerging research in non-invasive brain stimulation (NIBS) has vastly developed into a diversity of areas with promising potential. One of its clinical applications is the single-pulse transcranial magnetic stimulation (sTMS) applied over the occipital cortex which has been approved for treating migraine with aura, albeit limited evidence. Studies have also investigated other NIBS techniques, such as repetitive TMS (rTMS) and transcranial direct current stimulation (tDCS), for migraine prophylaxis but with conflicting results. As a dynamic brain disorder with widespread pathophysiology, targeting migraine with NIBS is challenging. Furthermore, unlike the motor cortex, evidence suggests that the visual cortex may be less plastic. Controversy exists as to whether the same fundamental principles of NIBS, based mainly on findings in the motor cortex, can be applied to the visual cortex. This review aims to explore existing literature surrounding NIBS studies on the visual system of migraine. We will first provide an overview highlighting the direct implication of the visual network in migraine. Next, we will focus on the rationale behind using NIBS for migraine treatment, including its effects on the visual cortex, and the shortcomings of currently available evidence. Finally, we propose a broader perspective of how novel approaches, the concept of brain networks and the integration of multimodal imaging with computational modeling, can help refine current NIBS methods, with the ultimate goal of optimizing a more individualized treatment for migraine.
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20
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Shepherd AJ, Patterson AJK. Exploration of anomalous perceptual experiences in migraine between attacks using the Cardiff Anomalous Perceptions Scale. Conscious Cogn 2020; 82:102945. [PMID: 32422548 DOI: 10.1016/j.concog.2020.102945] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 04/28/2020] [Accepted: 04/30/2020] [Indexed: 02/04/2023]
Abstract
Distortions in sensory experiences that precede a migraine attack have been extensively documented, the most well-known being the visual aura. Distortions in the experience of other senses are also reported as part of an aura, albeit less frequently, together with changes in the perception or ownership of the body or body parts. There are many examples of differences in aspects of visual perception between migraine and control groups, between attacks, but not as much on unusual experiences involving other senses, the sense of the body or the experience of the environment. Seventy-seven migraine (33 with aura) and 74 control participants took part. Anomalous perceptions were experienced by both migraine and control groups, but more with migraine experienced them and rated them as more distressing, intrusive and frequent. Associations with reports of visual triggers of migraine and visual discomfort are presented. This study is the first to show relationships between these factors.
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Affiliation(s)
- Alex J Shepherd
- Department of Psychological Sciences, Birkbeck College, University of London, UK.
| | - Adam J K Patterson
- Department of Psychological Sciences, Birkbeck College, University of London, UK
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21
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Shepherd AJ. Tracking the Migraine Cycle Using Visual Tasks. Vision (Basel) 2020; 4:vision4020023. [PMID: 32365776 PMCID: PMC7355979 DOI: 10.3390/vision4020023] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 04/22/2020] [Accepted: 04/24/2020] [Indexed: 12/14/2022] Open
Abstract
There are a number of reports that perceptual, electrophysiological and imaging measures can track migraine periodicity. As the electrophysiological and imaging research requires specialist equipment, it has few practical applications. This study sought to track changes in performance on four visual tasks over the migraine cycle. Coherence thresholds were measured for two motion and two orientation tasks. The first part of the study confirmed that the data obtained from an online study produced comparable results to those obtained under controlled laboratory conditions. Thirteen migraine with aura, 12 without aura, and 12 healthy controls participated. The second part of the study showed that thresholds for discriminating vertical coherent motion varied with the migraine cycle for a majority of the participants who tested themselves multiple times (four with aura, seven without). Performance improved two days prior to a migraine attack and remained improved for two days afterwards. This outcome is as expected from an extrapolation of earlier electrophysiological research. This research points to the possibility of developing sensitive visual tests that patients can use at home to predict an impending migraine attack and so take steps to try to abort it or, if it is inevitable, to plan their lives around it.
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Affiliation(s)
- A J Shepherd
- Department of Psychological Sciences, Birkbeck, University of London, London WC1E 7HX, UK
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22
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Tanik N, Akturk T, Saçmaci H, Inan LE. Anger and impulsiveness in migraine patients with and without aura. Neurol Res 2020; 42:253-259. [PMID: 32024445 DOI: 10.1080/01616412.2020.1723974] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Background and purpose: Migraine is a common primary headache disorder triggered by internal or external stimuli. Impulsitivity and anger are associated with many neurological and psychiatric disorders. The aim of this study was to investigate the anger and impulsivity in migraine patients with or without aura.Methods: A total of 55 patients aged between 18 and 55, who were diagnosed with episodic migraine (31 with aura and 24 without aura) and 40 healthy controls were enrolled in this prospective cross-sectional study.Migraine diagnosis and classification were based on criteria from the International Classification of Headache Disorders, 3rd edition (beta version). Multidimensional Anger Scale and Barratt Impulsivity Scale-11 were administered to the patient and control groups.Results:Migraine patients with aura, migraine patients without aura and control groups were compared, anger symptoms were significantly higher in migraine patients with aura (p < 0.001), but between these groups there was no significant difference in terms of impulsivity (p = 0.711).Conclusions: It was found that anger symptoms were more common in migraine patients with aura compared to migraine patients without aura and control group, but in impulsitivity there was no difference between groups.Further studies in future investigating the relation between migraine with aura and anger may pave the way for different and more specified treatment approach.
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Affiliation(s)
- Nermin Tanik
- Department of Neurology, Yozgat Bozok University Medical School, Yozgat, Turkey
| | - Tülin Akturk
- Department of Neurology, Yozgat Bozok University Medical School, Yozgat, Turkey
| | - Hikmet Saçmaci
- Department of Neurology, Yozgat Bozok University Medical School, Yozgat, Turkey
| | - Levent Ertugrul Inan
- Department of Neurology, Yozgat Bozok University Medical School, Yozgat, Turkey.,Department of Neurology, Ankara Research and Training Hospital, Ankara, Turkey
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23
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Qi X, Fan H, Yang X, Chen Y, Deng W, Guo W, Wang Q, Chen E, Li T, Ma X. High level of pattern glare in major depressive disorder. BMC Psychiatry 2019; 19:415. [PMID: 31864335 PMCID: PMC6925875 DOI: 10.1186/s12888-019-2399-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Accepted: 12/09/2019] [Indexed: 02/09/2023] Open
Abstract
BACKGROUND Visual deficits have been reported in abundance by recent studies on major depressive disorder. Pattern glare manifests as visual distortions, such as the symptoms of headache, glare, eyestrain, illusions of shapes, colors, and motion when viewing repetitive striped patterns, of which some can be observed in major depressive disorder. Inspired by what mentioned, the present study aims to explore whether there exists association between pattern glare and major depressive disorder and further attempts to explore possible clinical diagnostic value of pattern glare in major depressive disorder. METHODS Twenty-four patients diagnosed with major depressive disorder (MDDs group) were compared with 30 age-, gender- and education level-matched healthy control subjects (HCs group) on their visual stress with black-and-white gratings of different spatial frequencies-0.3 (low-SF), 2.3 (mid-SF), and 9.4 (high-SF) cycles per degree (c/deg)-which was named pattern glare test. The MDDs group divided into first episode medication-free group (fMDD) and recurrent medicated group (rMDD), comparisons of pattern glare scores (PGS) were performed within the MDDs group. We used Pearson and Spearman analysis to explore the relationship between some clinical indexes and pattern glare scores. ROC (receiver operating characteristic) curve was used to evaluate whether pattern glare test was able to discriminate patients and healthy controls. RESULTS The mid-SF pattern glare score significantly elevated in patients with major depressive disorder compared to control subjects. No differences of pattern glare scores were found between fMDD and rMDD. A significant negative correlation between mid-high difference and age in HCs group was found. There were no correlations between other variables and pattern glare scores. The mid-SF score has limited value in the diagnosis of major depressive disorder. CONCLUSIONS We observed an increased level of pattern glare in patients with major depressive disorder, reflecting the existence of cortical hyper-excitability in major depressive disorder. The mid-SF score may have a value in understanding cortical excitability in major depressive disorder.
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Affiliation(s)
- Xiongwei Qi
- 0000 0004 1770 1022grid.412901.fPsychiatric Laboratory and Mental Health Center, West China Hospital of Sichuan University, Chengdu, Sichuan 610064 People’s Republic of China
| | - Huanhuan Fan
- 0000 0004 1770 1022grid.412901.fPsychiatric Laboratory and Mental Health Center, West China Hospital of Sichuan University, Chengdu, Sichuan 610064 People’s Republic of China
| | - Xiao Yang
- 0000 0004 1770 1022grid.412901.fPsychiatric Laboratory and Mental Health Center, West China Hospital of Sichuan University, Chengdu, Sichuan 610064 People’s Republic of China
| | - Yayun Chen
- 0000 0004 1770 1022grid.412901.fPsychiatric Laboratory and Mental Health Center, West China Hospital of Sichuan University, Chengdu, Sichuan 610064 People’s Republic of China
| | - Wei Deng
- 0000 0004 1770 1022grid.412901.fPsychiatric Laboratory and Mental Health Center, West China Hospital of Sichuan University, Chengdu, Sichuan 610064 People’s Republic of China ,0000 0004 1770 1022grid.412901.fWest China Brain Research Center, West China Hospital of Sichuan University, Chengdu, China
| | - Wanjun Guo
- 0000 0004 1770 1022grid.412901.fPsychiatric Laboratory and Mental Health Center, West China Hospital of Sichuan University, Chengdu, Sichuan 610064 People’s Republic of China ,0000 0004 1770 1022grid.412901.fWest China Brain Research Center, West China Hospital of Sichuan University, Chengdu, China
| | - Qiang Wang
- 0000 0004 1770 1022grid.412901.fPsychiatric Laboratory and Mental Health Center, West China Hospital of Sichuan University, Chengdu, Sichuan 610064 People’s Republic of China ,0000 0004 1770 1022grid.412901.fWest China Brain Research Center, West China Hospital of Sichuan University, Chengdu, China
| | - Eric Chen
- Department of Psychiatry, The University of Hong Kong, Queen Mary Hospital, Pokfulam, Hong Kong
| | - Tao Li
- 0000 0004 1770 1022grid.412901.fPsychiatric Laboratory and Mental Health Center, West China Hospital of Sichuan University, Chengdu, Sichuan 610064 People’s Republic of China ,0000 0004 1770 1022grid.412901.fWest China Brain Research Center, West China Hospital of Sichuan University, Chengdu, China
| | - Xiaohong Ma
- Psychiatric Laboratory and Mental Health Center, West China Hospital of Sichuan University, Chengdu, Sichuan, 610064, People's Republic of China. .,West China Brain Research Center, West China Hospital of Sichuan University, Chengdu, China.
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24
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Fong CY, Law WHC, Braithwaite JJ, Mazaheri A. Differences in early and late pattern-onset visual-evoked potentials between self- reported migraineurs and controls. NEUROIMAGE-CLINICAL 2019; 25:102122. [PMID: 31931401 PMCID: PMC6957816 DOI: 10.1016/j.nicl.2019.102122] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Revised: 11/17/2019] [Accepted: 12/10/2019] [Indexed: 11/19/2022]
Abstract
Migraineurs had an enhanced N2 evoked by gratings with a spatial frequency of 13 cpd. Migraineurs had an attenuated occipital late negativity (LN) for viewing all gratings. Hyperexcitable controls showed similar VEP pattern compared to migraineurs. Enhanced N2 deflection could be driven by cortical hyperexcitation. LN reduction could reflect inhibitory control during processing of aversive stimuli.
Striped patterns have been shown to induce strong visual illusions and discomforts to migraineurs in previous literature. Previous research has suggested that these unusual visual symptoms to be linked with the hyperactivity on the visual cortex of migraine sufferers. The present study searched for evidence supporting this hypothesis by comparing the visual evoked potentials (VEPs) elicited by striped patterns of specific spatial frequencies (0.5, 3, and 13 cycles-per-degree) between a group of 29 migraineurs (17 with aura/12 without) and 31 non-migraineurs. In addition, VEPs to the same stripped patterns were compared between non-migraineurs who were classified as hyperexcitable versus non-hyperexcitable using a previously established behavioural pattern glare task. We found that the migraineurs had a significantly increased N2 amplitude for stimuli with 13 cpd gratings but an attenuated late negativity (LN: 400 – 500 ms after the stimuli onset) for all the spatial frequencies. Interestingly, non-migraineurs who scored as hyperexcitable appeared to have similar response patterns to the migraineurs, albeit in an attenuated form. We propose that the enhanced N2 could reflect disruption of the balance between parvocellular and magnocellular pathway, which is in support of the cortical hyperexcitation hypothesis in migraineurs. In addition, the attenuation of the late negativity could reflect a top-down feedback mechanism to suppress visual processing of an aversive stimulus.
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Affiliation(s)
- Chun Yuen Fong
- School of Psychology, University of Birmingham, B15 2TT, UK.
| | | | | | - Ali Mazaheri
- School of Psychology, University of Birmingham, B15 2TT, UK; Centre of Human Brain Health, University of Birmingham, B15 2TT, UK
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25
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Wesner MF, Brazeau J. The Psychophysical Assessment of Hierarchical Magno-, Parvo- and Konio-Cellular Visual Stream Dysregulations in Migraineurs. Eye Brain 2019; 11:49-62. [PMID: 31819693 PMCID: PMC6890234 DOI: 10.2147/eb.s225171] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 11/08/2019] [Indexed: 01/03/2023] Open
Abstract
Introduction Although conscious, image-forming illusions have been noted in migraine, few studies have specifically sought to collectively evaluate the role of all three parallel visual processing streams in the retinogeniculostriate pathway involved with image-forming vision and their implications in the development of migraine symptoms. Methods We psychophysically assessed the functionality of the inferred magnocellular (MC), parvocellular (PC), and koniocellular (KC) streams at different hierarchical loci across three clinical groups: individuals who experience migraine with aura (MA; n=13), experience migraine without aura (MWO; n=14), and Controls (n=15). Participants completed four experiments: Experiment 1 designed to assess retinal short-wavelength-sensitive (S-) cone sensitivities; Experiment 2 intended to measure postretinal temporal and spatiochromatic contrast sensitivities; Experiment 3 intended to assess postretinal spatiotemporal achromatic contrast sensitivities; and Experiment 4 designed to measure thalamocortical color discriminations along the three cone-excitation axes. Results S-cone deficits were revealed with greater retinal areas being affected in MA compared to MWO participants. Findings across the four experiments suggest a prominent retinal locus of dysfunction in MA (lesser in MWO) with potential feedforward compensations occurring within the KC visual stream. Conclusion Complex, integrative network compensations need to be factored in when considering the dysregulating influences of migraine along the visual pathway.
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Affiliation(s)
- Michael F Wesner
- Psychology Department, Lakehead University, Thunder Bay, Ontario P7B 5E1, Canada
| | - James Brazeau
- Center for Pediatric Excellence, Ottawa, ON K2G 1W2, Canada
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26
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Multi-Method Health Co-Inquiry: a Case Illustration for Persons with Chronic Illness, Caregivers, Providers, and Researchers. CURRENT PSYCHOLOGY 2019. [DOI: 10.1007/s12144-017-9676-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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27
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Fong CY, Takahashi C, Braithwaite JJ. Evidence for distinct clusters of diverse anomalous experiences and their selective association with signs of elevated cortical hyperexcitability. Conscious Cogn 2019; 71:1-17. [DOI: 10.1016/j.concog.2019.03.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Revised: 03/08/2019] [Accepted: 03/12/2019] [Indexed: 10/27/2022]
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28
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Frederiksen SD, Haanes KA, Warfvinge K, Edvinsson L. Perivascular neurotransmitters: Regulation of cerebral blood flow and role in primary headaches. J Cereb Blood Flow Metab 2019; 39:610-632. [PMID: 29251523 PMCID: PMC6446417 DOI: 10.1177/0271678x17747188] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Revised: 11/04/2017] [Accepted: 11/06/2017] [Indexed: 12/17/2022]
Abstract
In order to understand the nature of the relationship between cerebral blood flow (CBF) and primary headaches, we have conducted a literature review with particular emphasis on the role of perivascular neurotransmitters. Primary headaches are in general considered complex polygenic disorders (genetic and environmental influence) with pathophysiological neurovascular alterations. Identified candidate headache genes are associated with neuro- and gliogenesis, vascular development and diseases, and regulation of vascular tone. These findings support a role for the vasculature in primary headache disorders. Moreover, neuronal hyperexcitability and other abnormalities have been observed in primary headaches and related to changes in hemodynamic factors. In particular, this relates to migraine aura and spreading depression. During headache attacks, ganglia such as trigeminal and sphenopalatine (located outside the blood-brain barrier) are variably activated and sensitized which gives rise to vasoactive neurotransmitter release. Sympathetic, parasympathetic and sensory nerves to the cerebral vasculature are activated. During migraine attacks, altered CBF has been observed in brain regions such as the somatosensory cortex, brainstem and thalamus. In regulation of CBF, the individual roles of neurotransmitters are partly known, but much needs to be unraveled with respect to headache disorders.
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Affiliation(s)
- Simona D Frederiksen
- Department of Clinical Experimental Research, Glostrup Research Institute, Rigshospitalet Glostrup, Glostrup, Denmark
| | - Kristian A Haanes
- Department of Clinical Experimental Research, Glostrup Research Institute, Rigshospitalet Glostrup, Glostrup, Denmark
| | - Karin Warfvinge
- Department of Clinical Experimental Research, Glostrup Research Institute, Rigshospitalet Glostrup, Glostrup, Denmark
- Division of Experimental Vascular Research, Department of Clinical Sciences, Lund University, Lund, Sweden
| | - Lars Edvinsson
- Department of Clinical Experimental Research, Glostrup Research Institute, Rigshospitalet Glostrup, Glostrup, Denmark
- Division of Experimental Vascular Research, Department of Clinical Sciences, Lund University, Lund, Sweden
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Shepherd AJ. A Review of Motion and Orientation Processing in Migraine. Vision (Basel) 2019; 3:E12. [PMID: 31735813 PMCID: PMC6802770 DOI: 10.3390/vision3020012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Accepted: 03/07/2019] [Indexed: 11/24/2022] Open
Abstract
Visual tests can be used as noninvasive tools to test models of the pathophysiology underlying neurological conditions, such as migraine. They may also be used to track changes in performance that vary with the migraine cycle or can track the efficacy of prophylactic treatments. This article reviews the literature on performance differences on two visual tasks, global motion discrimination and orientation, which, of the many visual tasks that have been used to compare differences between migraine and control groups, have yielded the most consistent patterns of group differences. The implications for understanding the underlying pathophysiology in migraine are discussed, but the main focus is on bringing together disparate areas of research and suggesting those that can reveal practical uses of visual tests to treat and manage migraine.
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Affiliation(s)
- Alex J Shepherd
- Department of Psychological Sciences, Birkbeck, University of London, Malet St, London WC1E 7HX, UK
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Veszeli J, Shepherd AJ. A comparison of the effects of the colour and size of coloured overlays on young children's reading. Vision Res 2019; 156:73-83. [PMID: 30664883 DOI: 10.1016/j.visres.2019.01.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Revised: 12/24/2018] [Accepted: 01/08/2019] [Indexed: 10/27/2022]
Abstract
This study compared the effects of the colour and size of overlays on reading time, reading errors and on the clarity of text with young primary school children. The sample comprised a non-clinical, typical, sample from an East London primary school. One hundred and six children aged between four and seven years were asked to read 11 short passages of text (60 words) either with full page overlays or smaller reading rulers (53 in each group). This sample included younger children than has often been tested before. The 11 short passages allowed an assessment of baseline reading performance (no reading aid) and performance while reading with each of a set of ten coloured reading aids. Two different, yet beneficial, colours were determined: the most effective and the clearest/most comfortable. Both of these measures are not usually recorded. All but four children had reduced reading times with one of the reading aids and all but one reported their aid improved the perceived visual clarity of the text: the size of the reading aid did not affect reading time or visual clarity significantly. The numbers of skipped words and errors/mis-read words also decreased when reading with the most effective and most comfortable reading aid. Near visual acuity was assessed with and without each child's most effective coloured aid. The most effective aid improved acuity in over a third of the children. Acuity has not been assessed in previous studies. As reported previously, different colours helped different children. In conclusion, coloured reading overlays reduced reading times on the reading test employed here and the size of the reading aid was not crucial to facilitate performance. The largest reductions occurred for the youngest readers, suggesting these aids may be particularly effective for early readers.
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Affiliation(s)
- Judit Veszeli
- Department of Psychological Sciences, Birkbeck, University of London, London, UK
| | - Alex J Shepherd
- Department of Psychological Sciences, Birkbeck, University of London, London, UK.
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Singh AS. Mirror Induced Headaches: A New Self Image Trigger for Migraine Attacks? Headache 2018; 58:755-757. [DOI: 10.1111/head.13293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/29/2018] [Indexed: 11/30/2022]
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Abstract
PURPOSE Migraine is a multifactorial disorder that presents with unilateral headache and several sensory symptoms. Photophobia is one of the ophthalmic manifestations that cause significant morbidity. The trigeminal pathway that innervates the cornea in the form of afferents has been implicated in photophobia associated with chronic migraine. This study investigates changes in the corneal subbasal nerve plexus (SBNP) in chronic migraine patients with and without photophobia. METHODS Thirty-six patients with migraine and photophobia (group 1), 24 patients with migraine without photophobia (group 2), and 24 age- and sex-matched controls (group 3) were studied. A detailed history analysis and ophthalmic evaluation were performed on all subjects. In vivo confocal microscopy (IVCM) with automated CCMetrics software was used to quantify changes in the SBNP in all 3 groups. Measured parameters were compared using analysis of variance. RESULTS Analysis of corneal SBNP features revealed a significant decrease in the corneal nerve fiber length (14.76 ± 3.98 mm/mm), total branch density (43.37 ± 21.63 branch points/mm), nerve branch density (30.19 ± 15.76 number of branches/mm), and fiber area (0.005 ± 0.001 total nerve fiber area/mm) in patients of group 1 compared with group 2 (P < 0.05). CONCLUSIONS Structural changes in nociceptive corneal axons in the SBNP of patients with migraine with photophobia lend further support to the hypothesis that the trigeminal system plays a critical role in the pathogenesis of ocular symptoms in migraine. Our observations demonstrate that SBNP changes on IVCM may serve as a potential imaging marker for ocular symptoms of chronic migraine, and this warrants further investigation.
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Ayaki M, Kawashima M, Uchino M, Tsubota K, Negishi K. Gender differences in adolescent dry eye disease: a health problem in girls. Int J Ophthalmol 2018; 11:301-307. [PMID: 29487823 DOI: 10.18240/ijo.2018.02.20] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Accepted: 11/20/2017] [Indexed: 11/23/2022] Open
Abstract
AIM To evaluate the signs and symptoms of dry eye disease (DED) in adolescents. METHODS This was a cross-sectional, case-control study and outpatients aged 10 to 19y were recruited from six eye clinics of various practices and locations in Japan, and 253 non-DED subjects and 70 DED patients were enrolled. Participants were examined for DED-related signs. Patients were also interviewed to ascertain the presence or absence of six common DED-related symptoms: dryness, irritation, pain, eye fatigue, blurring, and photophobia. Main outcome measures were differences in signs and symptoms of dry eye disease between boys and girls. RESULTS Of the 323 adolescents recruited, 70 (21.7%) were diagnosed with DED. Significant differences between the non-DED and DED groups were found for short tear break-up time (BUT; ≤5s; P=0.000) and superficial punctate keratopathy (SPK; staining score ≥3; P=0.000). Late adolescent girls reported fewer symptoms than late adolescent boys, although their DED-related signs were worse compared to other groups. The prevalence and severity of DED were similar in the Tokyo area compared with suburban and local areas but myopic errors were worse. CONCLUSION We find that adolescents reported symptoms of DED similar to those found in adults, and the majority have short BUT-type DED. The prevalence and severity of DED in late adolescent girls is comparable with adults. Adolescents with DED are underserved and we believe that DED is a hidden but potentially serious health problem for this age group.
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Affiliation(s)
- Masahiko Ayaki
- Department of Ophthalmology, Keio University School of Medicine, Tokyo, Japan
| | - Motoko Kawashima
- Department of Ophthalmology, Keio University School of Medicine, Tokyo, Japan
| | - Miki Uchino
- Department of Ophthalmology, Keio University School of Medicine, Tokyo, Japan
| | - Kazuo Tsubota
- Department of Ophthalmology, Keio University School of Medicine, Tokyo, Japan
| | - Kazuno Negishi
- Department of Ophthalmology, Keio University School of Medicine, Tokyo, Japan
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Han D, Wegrzyn J, Bi H, Wei R, Zhang B, Li X. Practice makes the deficiency of global motion detection in people with pattern-related visual stress more apparent. PLoS One 2018; 13:e0193215. [PMID: 29447280 PMCID: PMC5814055 DOI: 10.1371/journal.pone.0193215] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Accepted: 01/23/2018] [Indexed: 11/21/2022] Open
Abstract
Aims Pattern-related visual stress (PRVS) refers to the perceptual difficulties experienced by some individuals when exposed to high contrast striped patterns. People with PRVS were reported to have reduced sensitivity to global motion at baseline testing and the difference disappears at a second estimate. The present study was to investigate the effect of practice on global motion threshold in adults with and without PRVS. Methods A total of 101 subjects were recruited and the Wilkins & Evans Pattern Glare Test was used to determine if a subject had PRVS. The threshold to detect global motion was measured with a random dot kinematogram. Each subject was measured 5 times at the first visit and again a month later. Receiver operating characteristic (ROC) curve analysis was applied to show the agreement between the two tests. Results Twenty-nine subjects were classified as having PRVS and 72 were classified as normal. At baseline, the threshold to detect global motion was significantly higher in subjects with PRVS (0.832 ± 0.098 vs. 0.618 ± 0.228, p < 0.001). After 5 sessions, the difference between the normal and subjects with PRVS increased (0.767 ± 0.170 vs. 0.291 ± 0.149, p < 0.001). In ROC analysis, the area under the curve (AUC) improved from 0.792 at baseline to 0.964 at the fifth session. After a one-month break, the difference between normal and subjects with PRVS was still significant (0.843 ± 0.169 vs. 0.407 ± 0.216, p < 0.001) and the AUC was 0.875. Conclusion The ability to detect global motion is impaired in persons with PRVS and the difference increased after additional sessions of practice.
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Affiliation(s)
- Ding Han
- School of Optometry and Ophthalmology, Tianjin Medical University Eye Hospital, Tianjin, China
| | - Jana Wegrzyn
- College of Optometry, Nova Southeastern University, Fort Lauderdale, Florida, United States of America
| | - Hua Bi
- College of Optometry, Nova Southeastern University, Fort Lauderdale, Florida, United States of America
| | - Ruihua Wei
- School of Optometry and Ophthalmology, Tianjin Medical University Eye Hospital, Tianjin, China
| | - Bin Zhang
- College of Optometry, Nova Southeastern University, Fort Lauderdale, Florida, United States of America
- * E-mail: (BZ); (XRL)
| | - Xiaorong Li
- School of Optometry and Ophthalmology, Tianjin Medical University Eye Hospital, Tianjin, China
- * E-mail: (BZ); (XRL)
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Evans BJW, Allen PM, Wilkins AJ. A Delphi study to develop practical diagnostic guidelines for visual stress (pattern-related visual stress). JOURNAL OF OPTOMETRY 2017; 10:161-168. [PMID: 27890547 PMCID: PMC5484780 DOI: 10.1016/j.optom.2016.08.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Revised: 08/26/2016] [Accepted: 08/28/2016] [Indexed: 05/12/2023]
Abstract
PURPOSE Visual stress (VS) is characterised by symptoms of visual perceptual distortions and eyestrain when viewing text, symptoms that are alleviated by individually prescribed coloured filters. A recent review supports the existence of VS and its treatment, but noted that controversy remains, in part due to inconsistencies in the diagnosis of the condition. The present paper reviews the diagnostic criteria for VS in the literature and reports a Delphi analysis of the criteria currently used in clinical practice. METHODS Twenty-six eyecare practitioners were invited to participate in a Delphi study. They were selected because they were frequent prescribers of precision tinted lenses. In the first round they were sent a list of the indicators for which there is literature to suggest a relevance in the diagnosis of VS. The practitioners were invited to rank the indicators and add any additional criteria they use in diagnosis. In the second round a revised list was circulated, including items added from the responses in the first round. RESULTS The respondents included optometrists, orthoptists and opticians. In the first round the response rate was 85%. Ninety-one percent of those who participated in the first round also responded in the second round. Strong indicators in the second round included the symptom of words moving when reading, voluntary use of an overlay for a prolonged period, improved performance of ≥15% with an overlay on the Wilkins Rate of Reading test, and an abnormally high score on the Pattern Glare Test. CONCLUSIONS The strongest diagnostic criteria are combined in a diagnostic tool. This is proposed as a guide for clinical practice and further research.
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Affiliation(s)
- Bruce J W Evans
- Institute of Optometry, London, UK; Division of Optometry & Visual Science, City, University London, UK.
| | - Peter M Allen
- Department of Vision and Hearing Sciences and Vision and Eye Research Unit, Anglia Ruskin University, Cambridge, UK
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The impact of dysfunctional tear films and optical aberrations on chronic migraine. EYE AND VISION 2017; 4:4. [PMID: 28251169 PMCID: PMC5320710 DOI: 10.1186/s40662-017-0070-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 09/03/2016] [Accepted: 02/09/2017] [Indexed: 11/17/2022]
Abstract
Background Migraine is a multifactorial disorder with complex neuronal and vascular mechanisms that encompasses a wide clinical spectrum of symptoms, including ocular manifestations. Dry eye disease and dysfunction of ocular somatosensory pathways have been implicated in the pathogenesis. The current study investigates the association between a dysfunctional tear film and ocular aberrations with migraine. Methods Sixty eyes of 30 patients with migraine and 60 eyes of 30 controls were studied. Dry eye evaluation included Schirmer’s test, tear film break-up time, corneal esthesiometry and lipid layer analysis using Lipiview® interferometer. Wavefront aberrations were measured using Optical Path Difference before performing the dry eye evaluation. The intraocular light scatter was quantified using the objective scatter index (OSI) of the optical quality analysis system. Measured parameters were compared between the migraine and the control group using independent sample t-test. Statistical analysis was performed using commercial software. A p value of ≤ 0.05 was considered statistically significant. Results There were 19 females and 11 males in each group. Statistically significant difference was found between the two groups with respect to total aberrations (p = 0.049), higher order aberrations (p = 0.009), coma (p = 0.03), spherical aberrations (p = 0.018), Lipiview interferometric coloric units (p < 0.001) and OSI (p < 0.001). Trefoil (p = 0.26) and TBUT (p = 0.398) were not significantly different between both groups. Conclusions Ocular aberrations are higher in patients with migraine as compared with controls. Tear film abnormalities add to the aberrations in otherwise asymptomatic patients and may also be associated with migraineous attacks. Treating the ocular surface to obtain a healthy tear film might introduce a potential modifiable factor in the prevention of migraneous attacks.
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Ludlow AK, Wilkins AJ. Atypical Sensory behaviours in children with Tourette's Syndrome and in children with Autism Spectrum Disorders. RESEARCH IN DEVELOPMENTAL DISABILITIES 2016; 56:108-116. [PMID: 27286465 DOI: 10.1016/j.ridd.2016.05.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Revised: 05/12/2016] [Accepted: 05/23/2016] [Indexed: 06/06/2023]
Abstract
Certain visual disturbances make it difficult to read text and have been attributed to visual stress, also called "pattern-related visual stress". 12 Children with ASD, 12 children with Tourette's syndrome and without ASD and 12 controls, all matched on age and non verbal ability, participated in an experiment exploring sensory behaviours and visual stress. Reading rate and accuracy were assessed with the Wilkins Rate of Reading test with and without the Intuitive Overlays. Both the children with Tourette's and the children with ASD showed a higher prevalence of atypical sensory behaviours and symptoms of visual stress than the typically developing control children. Six out of twelve children with Tourette's syndrome (50%) read more accurately and over 15% more quickly with a coloured overlay. Four of the 12 children with ASD and none of the control children read over 15% more quickly with an overlay. The findings are discussed in relation to problems in sensory modulation.
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Affiliation(s)
- Amanda K Ludlow
- University of Hertfordshire, College Lane, Hatfield, AL10 9AB, United Kingdom; University of Birmingham, Edgbaston, B15 2TT, United Kingdom.
| | - Arnold J Wilkins
- University of Essex, Wivenhoe Park, Colchester CO4 3SQ, United Kingdom.
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Abstract
Background Migraine is a common neurological condition that often involves differences in visual processing. These sensory processing differences provide important information about the underlying causes of the condition, and for the development of treatments. Review of psychophysical literature Psychophysical experiments have shown consistent impairments in contrast sensitivity, orientation acuity, and the perception of global form and motion. They have also established that the addition of task-irrelevant visual noise has a greater effect, and that surround suppression, masking and adaptation are all stronger in migraine. Theoretical signal processing model We propose utilising an established model of visual processing, based on signal processing theory, to account for the behavioural differences seen in migraine. This has the advantage of precision and clarity, and generating clear, falsifiable predictions. Conclusion Increased effects of noise and differences in excitation and inhibition can account for the differences in migraine visual perception. Consolidating existing research and creating a unified, defined theoretical account is needed to better understand the disorder.
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Affiliation(s)
- Louise O'Hare
- School of Psychology, College of Social Science, University of Lincoln, UK
| | - Paul B Hibbard
- Department of Psychology, University of Essex, UK
- School of Psychology and Neuroscience, University of St Andrews, UK
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Shepherd AJ, Joly-Mascheroni RM. Visual motion processing in migraine: Enhanced motion after-effects are related to display contrast, visual symptoms, visual triggers and attack frequency. Cephalalgia 2016; 37:315-326. [PMID: 27106927 DOI: 10.1177/0333102416640519] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background Visual after-effects are illusions that occur after prolonged viewing of visual displays. The motion after-effect (MAE), for example, is an illusory impression of motion after viewing moving displays: subsequently, stationary displays appear to drift in the opposite direction. After-effects have been used extensively in basic vision research and in clinical settings, and are enhanced in migraine. Objective The objective of this article is to assess associations between ( 1 ) MAE duration and visual symptoms experienced during/between migraine/headache attacks, and ( 2 ) visual stimuli reported as migraine/headache triggers. Methods The MAE was elicited after viewing motion for 45 seconds. MAE duration was tested for three test contrast displays (high, medium, low). Participants also completed a headache questionnaire that included migraine/headache triggers. Results For each test contrast, the MAE was prolonged in migraine. MAE duration was associated with photophobia; visual triggers (flicker, striped patterns); and migraine or headache frequency. Conclusions Group differences on various visual tasks have been attributed to abnormal cortical processing in migraine, such as hyperexcitability, heightened responsiveness and/or a lack of intra-cortical inhibition. The results are not consistent with hyperexcitability simply from a general lack of inhibition. Alternative multi-stage models are discussed and suggestions for further research are recommended, including visual tests in clinical assessments/clinical trials.
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Affiliation(s)
- Alex J Shepherd
- 1 Department of Psychological Sciences, Birkbeck, University of London, UK
| | - Ramiro M Joly-Mascheroni
- 1 Department of Psychological Sciences, Birkbeck, University of London, UK.,2 Department of Psychology, City University, London, UK
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Monger LJ, Wilkins AJ, Allen PM. Pattern glare: the effects of contrast and color. Front Psychol 2015; 6:1651. [PMID: 26579034 PMCID: PMC4621622 DOI: 10.3389/fpsyg.2015.01651] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Accepted: 10/13/2015] [Indexed: 11/26/2022] Open
Abstract
Aim: To test a theory of visual stress by investigating the inter-relationships between (1) the threshold contrast/saturation at which individuals first report discomfort when viewing colored gratings of progressively increasing contrast and decreasing saturation; (2) the choice of a colored overlay for reading; (3) any increase in reading speed when the overlay is used. Method: Ninety-five young adults, with normal color vision, reported illusions from square-wave gratings (Pattern Glare Test), chose any colored overlays that improved clarity (Intuitive Color Overlays) and read aloud randomly ordered common words (Wilkins Rate of Reading Test). This was followed by an automated choice of tints for text using various screen colors on a tablet, and a test of discomfort from patterns of progressively increasing contrast and decreasing saturation, using software developed for this study. All participants wore their optimal refractive correction throughout the procedure. Results: Fifty-eight participants chose a colored overlay and reported that it made text easier and more comfortable to read. On average, these individuals had a greater improvement in reading speed with their overlays (p = 0.003), a lower contrast threshold at which discomfort from achromatic gratings was first reported (p = 0.015), and a tendency to report more pattern glare (p = 0.052), compared to the other participants. Participants who chose both a most and least preferred tint for text using the automated procedure reported discomfort from colored gratings at a significantly higher contrast with their most preferred color compared to their least preferred color (p = 0.003). The choice of a colored tint was moderately consistent across tests. The most and least preferred colors tended to be complementary. Conclusion: Colored tints that improved reading speed reduced pattern glare both in terms of the illusion susceptibility and in terms of discomfort contrast threshold, supporting a theory of visual stress. An automated test that incorporates colored gratings and a choice of most and least preferred color might better identify individuals whose reading speed improves with colored overlays.
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Affiliation(s)
- Laura J Monger
- Department of Vision and Hearing Sciences, Anglia Ruskin University Cambridge, England
| | - Arnold J Wilkins
- Department of Psychology, University of Essex Colchester, England
| | - Peter M Allen
- Department of Vision and Hearing Sciences, Anglia Ruskin University Cambridge, England ; Vision and Eye Research Unit, Anglia Ruskin University Cambridge, England
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Chong CD, Starling AJ, Schwedt TJ. Interictal photosensitivity associates with altered brain structure in patients with episodic migraine. Cephalalgia 2015; 36:526-33. [DOI: 10.1177/0333102415606080] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Accepted: 07/26/2015] [Indexed: 11/16/2022]
Abstract
Background Migraine attacks manifest with hypersensitivities to light, sound, touch and odor. Some people with migraine have photosensitivity between migraine attacks, suggesting persistent alterations in the integrity of brain regions that process light. Although functional neuroimaging studies have shown visual stimulus induced “hyperactivation” of visual cortex regions in migraineurs between attacks, whether photosensitivity is associated with alterations in brain structure is unknown. Methods Levels of photosensitivity were evaluated using the Photosensitivity Assessment Questionnaire in 48 interictal migraineurs and 48 healthy controls. Vertex-by-vertex measurements of cortical thickness were assessed in 28 people with episodic migraine who had interictal photosensitivity (mean age = 35.0 years, SD = 12.1) and 20 episodic migraine patients without symptoms of interictal photosensitivity (mean age = 36.0 years, SD = 11.4) using a general linear model design. Results Migraineurs have greater levels of interictal photosensitivity relative to healthy controls. Relative to migraineurs without interictal photosensitivity, migraineurs with interictal photosensitivity have thicker cortex in several brain areas including the right lingual, isthmus cingulate and pericalcarine regions, and the left precentral, postcentral and supramarginal regions. Conclusion Episodic migraineurs with interictal photosensitivity have greater cortical thickness in the right parietal-occipital and left fronto-parietal regions, suggesting that persistent light sensitivity is associated with underlying structural alterations.
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Gilchrist JM, Allen PM. Lexical decisions in adults with low and high susceptibility to pattern-related visual stress: a preliminary investigation. Front Psychol 2015; 6:449. [PMID: 25926810 PMCID: PMC4396132 DOI: 10.3389/fpsyg.2015.00449] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Accepted: 03/30/2015] [Indexed: 11/25/2022] Open
Abstract
Pattern-related visual stress (PRVS) is a form of sensory hypersensitivity that some people experience when viewing high contrast repeating patterns, notably alternating dark and light stripes. Those susceptible to PRVS typically have a strong aversion to such stimuli, and this is often accompanied by experiences of visual discomfort and disturbance. The patterns most likely to elicit symptoms of PRVS have a square-wave grating configuration of spatial frequency ~3 cycles/degree. Such stimuli are characteristic of printed text in which lines of words and the spaces between them present a high contrast grating-like stimulus. Consequently, much printed reading material has the potential to elicit PRVS that may impair reading performance, and this problem appears to be common in individuals with reading difficulties including dyslexia. However, the manner in which PRVS affects reading ability is unknown. One possibility is that the early sensory visual stress may interfere with the later cognitive word recognition stage of the reading process, resulting in reading performance that is slower and/or less accurate. To explore the association of PRVS with word recognition ability, lexical decision performance (speed and accuracy) to words and pronounceable non-words was measured in two groups of adults, having low and high susceptibility to PRVS. Results showed that lexical decisions were generally faster but less accurate in high-PRVS, and also that high-PRVS participants made decisions significantly faster for words than for non-words, revealing a strong lexicality effect that was not present in low-PRVS. These findings are novel and, as yet, unconfirmed by other studies.
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Affiliation(s)
- James M Gilchrist
- School of Optometry and Vision Science, University of Bradford Bradford, UK
| | - Peter M Allen
- Vision and Eye Research Unit, Department of Vision and Hearing Sciences, Anglia Ruskin University Cambridge, UK
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Imaizumi S, Honma M, Hibino H, Koyama S. Illusory visual motion stimulus elicits postural sway in migraine patients. Front Psychol 2015; 6:542. [PMID: 25972832 PMCID: PMC4411888 DOI: 10.3389/fpsyg.2015.00542] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Accepted: 04/15/2015] [Indexed: 11/13/2022] Open
Abstract
Although the perception of visual motion modulates postural control, it is unknown whether illusory visual motion elicits postural sway. The present study examined the effect of illusory motion on postural sway in patients with migraine, who tend to be sensitive to it. We measured postural sway for both migraine patients and controls while they viewed static visual stimuli with and without illusory motion. The participants' postural sway was measured when they closed their eyes either immediately after (Experiment 1), or 30 s after (Experiment 2), viewing the stimuli. The patients swayed more than the controls when they closed their eyes immediately after viewing the illusory motion (Experiment 1), and they swayed less than the controls when they closed their eyes 30 s after viewing it (Experiment 2). These results suggest that static visual stimuli with illusory motion can induce postural sway that may last for at least 30 s in patients with migraine.
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Affiliation(s)
- Shu Imaizumi
- Graduate School of Engineering, Chiba University Chiba, Japan ; Japan Society for the Promotion of Science Tokyo, Japan
| | | | - Haruo Hibino
- Graduate School of Engineering, Chiba University Chiba, Japan
| | - Shinichi Koyama
- Graduate School of Engineering, Chiba University Chiba, Japan ; School of Medicine, Showa University Tokyo, Japan ; School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore Singapore
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Abstract
BACKGROUND Migraine, a common brain disorder, disrupts vision more than any other motor or sensory function. The possible visual aura symptoms vary from occasional small flashes of light to complex visual hallucinations, the stereotyped teichopsia being the most typical pattern. It is unclear as to why aura occurs serendipitously, sometimes preceding, but also occurring after the headache, and why aura can present with multiple phenotypes. METHODS To better understand the nature of visual disturbances in migraine, 4 aspects must be considered: What are the visual perceptions in migraine; why vision is affected in migraine; the role of cortical spreading depression (CSD); how does vision could affect migraine. Evidence supporting each of these topics is reviewed. RESULTS CSD travels at a similar pace as the march of symptoms in the visual field. Functional neuroimaging studies show spreading changes compatible with CSD regardless of aura. Computerized models reproducing the CSD march on the visual cortex predict a sensory experience compatible with naturally occurring visual auras. Rather than spreading in all directions, these models suggest that CSD moves preferentially in one direction. Migraine-preventive drugs increase the CSD threshold and reduce CSD velocity. Blind migraineurs may present atypical visual aura, with more colors, shorter duration, different shapes, and atypical symptoms, such as auditory experiences. CONCLUSIONS CSD is the underlying phenomenon in migraine with and without aura. In migraine without aura, CSD probably does not run over silent areas of the cortex, but rather does not reach symptomatology threshold. Normal vision is important in migraine, as lack of sight may change the visual experience during migraine aura, probably due to cortical reorganization and changes in local susceptibility to CSD.
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Affiliation(s)
- Maurice B Vincent
- Hospital Universitário Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
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Bridge H, Stagg CJ, Near J, Lau CI, Zisner A, Cader MZ. Altered neurochemical coupling in the occipital cortex in migraine with visual aura. Cephalalgia 2015; 35:1025-30. [PMID: 25631169 DOI: 10.1177/0333102414566860] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2014] [Accepted: 12/06/2014] [Indexed: 11/15/2022]
Abstract
BACKGROUND Visual aura is present in about one-third of migraine patients and triggering by bright or flickering lights is frequently reported. METHOD Using migraine with visual aura patients, we investigated the neurochemical profile of the visual cortex using magnetic resonance spectroscopy. Specifically, glutamate/creatine and GABA/creatine ratios were quantified in the occipital cortex of female migraine patients. RESULTS GABA levels in the occipital cortex of migraine patients were lower than that of controls. Glutamate levels in migraine patients, but not controls, correlated with the blood-oxygenation-level-dependent (BOLD) signal in the primary visual cortex during visual stimulation. CONCLUSION Migraine with visual aura appears to disrupt the excitation-inhibition coupling in the occipital cortex.
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Affiliation(s)
- Holly Bridge
- Nuffield Department of Clinical Neuroscience, University of Oxford, UK Oxford Centre for Functional MRI of the Brain (FMRIB), University of Oxford, UK
| | - Charlotte J Stagg
- Nuffield Department of Clinical Neuroscience, University of Oxford, UK Oxford Centre for Functional MRI of the Brain (FMRIB), University of Oxford, UK Oxford Centre for Human Brain Activity, University of Oxford, UK
| | - Jamie Near
- Douglas Mental Health University Institute and Department of Psychiatry, McGill University, Canada
| | - Chi-ieong Lau
- Department of Neurology, Shin-Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan
| | - Aimee Zisner
- Oxford Centre for Functional MRI of the Brain (FMRIB), University of Oxford, UK
| | - M Zameel Cader
- Nuffield Department of Clinical Neuroscience, University of Oxford, UK Oxford Headache Centre, John Radcliffe Hospital, Oxford, UK
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Silva GCDC, Góes CPDQF, Vincent MB. Aura-like features and photophobia in sightless migraine patients. ARQUIVOS DE NEURO-PSIQUIATRIA 2014; 72:949-53. [DOI: 10.1590/0004-282x20140200] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2014] [Accepted: 09/18/2014] [Indexed: 01/03/2023]
Abstract
Migraine is a central nervous system disorder frequently expressed with paroxysmal visual dysfunctions. Objective To test the hypothesis that normal visual input is vital for the migrainous aura and photophobia. Method We studied the migraine-related visual disturbances in 8 sightless migraineurs identified among 200 visually impaired subjects. Results The main findings were the visual aura and photophobia disappearance along with blindness development, the oddness of aura – too short, colourful (e.g. blue or fire-like), auditory in nature or different in shape (round forms) – and the lack of photophobia. Conclusion We propose that the aura duration should be accepted as shorter in visually impaired subjects. The changes in aura phenotype observed in our patients may be the result of both cerebral plasticity induced by the visual impairment and/or the lack of visual input per se. Integrity of visual pathways plays a key role in migraine visual aura and photophobia.
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Lambert GA, Hoskin KL, Michalicek J, Panahi SE, Truong L, Zagami AS. Stimulation of dural vessels excites the SI somatosensory cortex of the cat via a relay in the thalamus. Cephalalgia 2013; 34:243-57. [DOI: 10.1177/0333102413508239] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Aim We carried out experiments in cats to determine the thalamo-cortical projection sites of trigeminovascular sensory neurons. Methods 1) We stimulated the middle meningeal artery (MMA) with C-fibre intensity electrical shocks and made field potential recordings over the somatosensory cortical surface. 2) We then recorded neurons in the ventroposteromedial (VPM) nucleus of the thalamus in search of neurons which could be activated from the skin, MMA and superior sagittal sinus. 3) Finally, we attempted to antidromically activate the neurons found in stage 2 by stimulating the responsive cortical areas revealed in stage 1. Results VPM neurons received trigeminovascular input, input from the V1 facial skin and could also be activated by electrical stimulation of the somatosensory cortex. VPM neurons activated from the cortex responded with short and invariant latencies (6.7 ± 7.7 msec mean and SD). They could follow high rates of stimulation and sometimes showed collision with orthodromic action potentials. Conclusions We conclude that somatosensory (SI) cortical stimulation excites trigeminovascular VPM neurons antidromically. In consequence, these VPM neurons project to the somatosensory cortex. These findings may help to explain the ability of migraineurs with headache in the trigeminal distribution to localise their pain to a particular region in this distribution.
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Affiliation(s)
| | - Karen L Hoskin
- Prince of Wales Clinical School, Faculty of Medicine, University of New South Wales, Australia
| | - Jan Michalicek
- Prince of Wales Clinical School, Faculty of Medicine, University of New South Wales, Australia
| | - Seyed E Panahi
- Prince of Wales Clinical School, Faculty of Medicine, University of New South Wales, Australia
| | - Linda Truong
- Prince of Wales Clinical School, Faculty of Medicine, University of New South Wales, Australia
| | - Alessandro S Zagami
- Prince of Wales Clinical School, Faculty of Medicine, University of New South Wales, Australia
- Institute of Neurological Sciences, Prince of Wales Hospital, Australia
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49
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Beasley IG, Davies LN. The effect of spectral filters on reading speed and accuracy following stroke. JOURNAL OF OPTOMETRY 2013; 6:134-140. [PMCID: PMC3880535 DOI: 10.1016/j.optom.2013.03.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Accepted: 02/15/2013] [Indexed: 06/04/2023]
Abstract
Purpose The aim of the study was to determine the effect of optimal spectral filters on reading performance following stroke. Methods Seventeen stroke subjects, aged 43–85, were considered with an age-matched Control Group (n = 17). Subjects undertook the Wilkins Rate of Reading Test on three occasions: (i) using an optimally selected spectral filter; (ii) subjects were randomly assigned to two groups: Group 1 used an optimal filter, whereas Group 2 used a grey filter, for two-weeks. The grey filter had similar photopic reflectance to the optimal filters, intended as a surrogate for a placebo; (iii) the groups were crossed over with Group 1 using a grey filter and Group 2 given an optimal filter, for two weeks, before undertaking the task once more. An increase in reading speed of >5% was considered clinically relevant. Results Initial use of a spectral filter in the stroke cohort, increased reading speed by ∼8%, almost halving error scores, findings not replicated in controls. Prolonged use of an optimal spectral filter increased reading speed by >9% for stroke subjects; errors more than halved. When the same subjects switched to using a grey filter, reading speed reduced by ∼4%. A second group of stroke subjects used a grey filter first; reading speed decreased by ∼3% but increased by ∼4% with an optimal filter, with error scores almost halving. Conclusions The present study has shown that spectral filters can immediately improve reading speed and accuracy following stroke, whereas prolonged use does not increase these benefits significantly.
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Affiliation(s)
- Ian G. Beasley
- Ophthalmic Research Group, Life and Health Sciences, Aston University, Birmingham, UK
- Aston Research Centre for Healthy Ageing (ARCHA), Aston University, Birmingham, UK
| | - Leon N. Davies
- Ophthalmic Research Group, Life and Health Sciences, Aston University, Birmingham, UK
- Aston Research Centre for Healthy Ageing (ARCHA), Aston University, Birmingham, UK
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Shepherd AJ, Hine TJ, Beaumont HM. Color and Spatial Frequency Are Related to Visual Pattern Sensitivity in Migraine. Headache 2013; 53:1087-103. [DOI: 10.1111/head.12062] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/31/2012] [Indexed: 01/07/2023]
Affiliation(s)
- Alex J. Shepherd
- Department of Psychological Sciences; Birkbeck; University of London; London; UK
| | | | - Heidi M. Beaumont
- Department of Applied Psychology; Griffith University; Brisbane; Qld; Australia
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