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Zhu Y, Zhu J, Song G. The impact of aerobic exercise training on cognitive function and gut microbiota in methamphetamine-dependent individuals in the community. Physiol Behav 2023; 270:114302. [PMID: 37474085 DOI: 10.1016/j.physbeh.2023.114302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 06/27/2023] [Accepted: 07/17/2023] [Indexed: 07/22/2023]
Abstract
OBJECTIVE This study aimed to investigate the impact and mechanism of gut microbiota on the enhancement of cognitive function in methamphetamine (MA)-dependent individuals during aerobic exercise training. METHODS A total of sixty-four MA-dependent individuals were randomly assigned to either an aerobic exercise training group (DK, n = 32) or a conventional rehabilitation group (CK, n = 32). After an eight-week intervention, the participants' working memory and inhibition ability were assessed using the Stroop paradigm and Go/NoGo paradigm, respectively. Gut microbiota composition was analyzed using high-throughput sequencing. RESULTS 1) Eight weeks of aerobic exercise training significantly improved the working memory and inhibition ability of MA-dependent individuals (P < 0.05). 2) Following the intervention, the DK group exhibited significantly higher levels of Lactobacillus, Lactococcus lactis, Prevotellaceae, and Ruminococcaceae compared to the CK group. Conversely, the DK group demonstrated significantly lower levels of Desulfovibrio and Akkermansia compared to the CK group. Furthermore, the DK group showed significantly increased metabolic pathways associated with d-Glutaralate and d-Galactate Degradation, as well as the Alanine, aspartate, and glutamate metabolism pathway, compared to the control group. 3) Cognitive function related to MA addiction positively correlated with Bifidobacterium, Dialister, and Adlercreutzia, while negatively correlated with Enterobacteria, Bacillus cereus, Catabacter, and Akkermansia. CONCLUSION Aerobic exercise training enhances working memory and inhibition ability in MA-dependent individuals, thereby mitigating the detrimental effects of MA addiction on cognitive function. Additionally, analysis of gut microbiota suggests that the modulation of gut microbiota and associated metabolic pathways play a role in regulating the improvement of cognitive function in MA-dependent individuals through exercise.
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Affiliation(s)
- Yuping Zhu
- Key Lab of Physical Fitness Evaluation and Motor Function Monitoring, College of Physical Education, Southwest University, Chongqing, 400715, China
| | - Jiang Zhu
- Key Lab of Physical Fitness Evaluation and Motor Function Monitoring, College of Physical Education, Southwest University, Chongqing, 400715, China
| | - Gang Song
- Key Lab of Physical Fitness Evaluation and Motor Function Monitoring, College of Physical Education, Southwest University, Chongqing, 400715, China.
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2
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Zou L, Herold F, Ludyga S, Kamijo K, Müller NG, Pontifex MB, Heath M, Kuwamizu R, Soya H, Hillman CH, Ando S, Alderman BL, Cheval B, Kramer AF. Look into my eyes: What can eye-based measures tell us about the relationship between physical activity and cognitive performance? JOURNAL OF SPORT AND HEALTH SCIENCE 2023; 12:568-591. [PMID: 37148971 PMCID: PMC10466196 DOI: 10.1016/j.jshs.2023.04.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 03/07/2023] [Accepted: 03/16/2023] [Indexed: 05/08/2023]
Abstract
BACKGROUND There is a growing interest to understand the neurobiological mechanisms that drive the positive associations of physical activity and fitness with measures of cognitive performance. To better understand those mechanisms, several studies have employed eye-based measures (e.g., eye movement measures such as saccades, pupillary measures such as pupil dilation, and vascular measures such as retinal vessel diameter) deemed to be proxies for specific neurobiological mechanisms. However, there is currently no systematic review providing a comprehensive overview of these studies in the field of exercise-cognition science. Thus, this review aimed to address that gap in the literature. METHODS To identify eligible studies, we searched 5 electronic databases on October 23, 2022. Two researchers independently extracted data and assessed the risk of bias using a modified version of the Tool for the assEssment of Study qualiTy and reporting in EXercise (TESTEX scale, for interventional studies) and the critical appraisal tool from the Joanna Briggs Institute (for cross-sectional studies). RESULTS Our systematic review (n = 35 studies) offers the following main findings: (a) there is insufficient evidence available to draw solid conclusions concerning gaze-fixation-based measures; (b) the evidence that pupillometric measures, which are a proxy for the noradrenergic system, can explain the positive effect of acute exercise and cardiorespiratory fitness on cognitive performance is mixed; (c) physical training- or fitness-related changes of the cerebrovascular system (operationalized via changes in retinal vasculature) are, in general, positively associated with cognitive performance improvements; (d) acute and chronic physical exercises show a positive effect based on an oculomotor-based measure of executive function (operationalized via antisaccade tasks); and (e) the positive association between cardiorespiratory fitness and cognitive performance is partly mediated by the dopaminergic system (operationalized via spontaneous eye-blink rate). CONCLUSION This systematic review offers confirmation that eye-based measures can provide valuable insight into the neurobiological mechanisms that may drive positive associations between physical activity and fitness and measures of cognitive performance. However, due to the limited number of studies utilizing specific methods for obtaining eye-based measures (e.g., pupillometry, retinal vessel analysis, spontaneous eye blink rate) or investigating a possible dose-response relationship, further research is necessary before more nuanced conclusions can be drawn. Given that eye-based measures are economical and non-invasive, we hope this review will foster the future application of eye-based measures in the field of exercise-cognition science.
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Affiliation(s)
- Liye Zou
- Body-Brain-Mind Laboratory, School of Psychology, Shenzhen University, Shenzhen 518060, China; Research Group Degenerative and Chronic Diseases, Movement, Faculty of Health Sciences Brandenburg, University of Potsdam, Potsdam 14476, Germany.
| | - Fabian Herold
- Body-Brain-Mind Laboratory, School of Psychology, Shenzhen University, Shenzhen 518060, China; Research Group Degenerative and Chronic Diseases, Movement, Faculty of Health Sciences Brandenburg, University of Potsdam, Potsdam 14476, Germany
| | - Sebastian Ludyga
- Department of Sport, Exercise, and Health, University of Basel, Basel 4052, Switzerland
| | - Keita Kamijo
- Faculty of Liberal Arts and Sciences, Chukyo University, Nagoya 466-8666, Japan
| | - Notger G Müller
- Body-Brain-Mind Laboratory, School of Psychology, Shenzhen University, Shenzhen 518060, China; Research Group Degenerative and Chronic Diseases, Movement, Faculty of Health Sciences Brandenburg, University of Potsdam, Potsdam 14476, Germany
| | - Matthew B Pontifex
- Department of Kinesiology, Michigan State University, East Lansing, MI 48824, USA
| | - Matthew Heath
- School of Kinesiology, Faculty of Health Sciences, University of Western Ontario, London ON N6A 3K7, Canada; Canadian Centre for Activity and Aging, University of Western Ontario, London ON, N6A 3K7, Canada; Graduate Program in Neuroscience, University of Western Ontario, London ON, N6A 3K7, Canada
| | - Ryuta Kuwamizu
- Laboratory of Exercise Biochemistry and Neuroendocrinology, Faculty of Health and Sport Sciences, University of Tsukuba, Tsukuba 305-0006, Japan
| | - Hideaki Soya
- Laboratory of Exercise Biochemistry and Neuroendocrinology, Faculty of Health and Sport Sciences, University of Tsukuba, Tsukuba 305-0006, Japan; Sport Neuroscience Division, Advanced Research Initiative for Human High Performance (ARIHHP), Faculty of Health and Sport Sciences, University of Tsukuba, Tsukuba 305-0006, Japan
| | - Charles H Hillman
- Center for Cognitive and Brain Health, Department of Psychology, Department of Physical Therapy, Movement, and Rehabilitation Sciences, Northeastern University, Boston, MA 02115, USA
| | - Soichi Ando
- Graduate School of Informatics and Engineering, The University of Electro-Communications, Tokyo 182-8585, Japan
| | - Brandon L Alderman
- Department of Kinesiology and Health, Rutgers University-New Brunswick, New Brunswick, NJ 08854, USA
| | - Boris Cheval
- Swiss Center for Affective Sciences, University of Geneva, Geneva 1205, Switzerland; Laboratory for the Study of Emotion Elicitation and Expression (E3Lab), Department of Psychology, University of Geneva, Geneva 1205, Switzerland
| | - Arthur F Kramer
- Department of Psychology, Center for Cognitive and Brain Health, Northeastern University, Boston, MA 02115, USA; Beckman Institute, University of Illinois at Urbana-Champaign, Champaign, IL 61820, USA
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Warren CV, Kroll CF, Kopp B. Dopaminergic and norepinephrinergic modulation of endogenous event-related potentials: A systematic review and meta-analysis. Neurosci Biobehav Rev 2023; 151:105221. [PMID: 37150485 DOI: 10.1016/j.neubiorev.2023.105221] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Revised: 05/02/2023] [Accepted: 05/03/2023] [Indexed: 05/09/2023]
Abstract
Event-related potentials (ERPs) represent the cortical processing of sensory, motor or cognitive functions invoked by particular events or stimuli. A current theory posits that the catecholaminergic neurotransmitters dopamine (DA) and norepinephrine (NE) modulate a number of endogenous ERPs during various cognitive processes. This manuscript aims to evaluate a leading neurotransmitter hypothesis with a systematic overview and meta-analysis of pharmacologic DA and NE manipulation of specific ERPs in healthy subjects during executive function. Specifically, the frontally-distributed P3a, N2, and Ne/ERN (or error-related negativity) are supposedly modulated primarily by DA, whereas the parietally-distributed P3b is thought to be modulated by NE. Based on preceding research, we refer to this distinction between frontally-distributed DA-sensitive and parietally-distributed NE-sensitive ERP components as the Extended Neurobiological Polich (ENP) hypothesis. Our systematic review and meta-analysis indicate that this distinction is too simplistic and many factors interact with DA and NE to influence these specific ERPs. These may include genetic factors, the specific cognitive processes engaged, or elements of study design, i.e. session or sequence effects or data-analysis strategies.
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Affiliation(s)
- Claire V Warren
- Charlotte Fresenius Hochschule, Alte Rabenstraße 32, 20148 Hamburg, Germany; Professorship for Clinical Psychology, Helmut-Schmidt University/ Bundeswehr University Hamburg, Holstenhofweg 85, 22043 Hamburg, Germany.
| | - Charlotte F Kroll
- Department of Psychiatry & Neuropsychology, School for Mental Health and Neuroscience, Faculty of Health, Medicine and Life Sciences, Maastricht University, Minderbroedersberg 4-6. P.O. Box 616, Maastricht, MD, 6200, The Netherlands
| | - Bruno Kopp
- Clinic für Neurology, Hannover Medical School, Carl-Neuberg-Straße 1, 30625 Hannover, Germany
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4
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Spontaneous eye blinking as a diagnostic marker in prolonged disorders of consciousness. Sci Rep 2021; 11:22393. [PMID: 34789832 PMCID: PMC8599689 DOI: 10.1038/s41598-021-01858-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2021] [Accepted: 11/01/2021] [Indexed: 11/26/2022] Open
Abstract
Clinical diagnosis of patients with prolonged disorders of consciousness is very challenging. As spontaneous eye blink rate (EBR) is reliably correlated with cognitive activity in healthy individuals, we investigated whether EBR could serve as a marker of patients' level of consciousness. We assessed ten patients in prolonged Vegetative State/Unresponsive Wakefulness Syndrome (VS/UWS; three females; mean age = 50.3 ± 17.8 years) and fourteen patients in Minimally Conscious State (MCS; three females; mean age = 52.9 ± 17.5 years) at their admission to a rehabilitation unit after the acute phase. During two separate 3-min rest conditions, we recorded patients' EBR by integrating on-line visual and off-line electro-oculographic count. We also assessed EBR during two auditory oddball tasks, i.e. passive listening and active counting of target tones in a sub-group of patients. EBR was significantly higher in MCS than in VS/UWS; moreover, EBR positively correlated with a validated index of responsiveness derived from the Coma Recovery Scale-Revised. Patients' mean EBR showed no significant differences within sessions and across experimental conditions of the oddball task, in both VS/UWS and MCS. Our findings suggest that, at least in the post-acute phase, observing patients' EBR for 3 min at rest could help to discriminate between VS/UWS and MCS, improving accuracy of clinical diagnosis.
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Stebbins HE, Jacobs ME, Hatton KT, Kaila EN, Rhoades MM. Spontaneous eye blink rate mediates the relationship between sleepiness and impulsivity to negative stimuli. Biol Psychol 2021; 165:108191. [PMID: 34530069 DOI: 10.1016/j.biopsycho.2021.108191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 09/09/2021] [Accepted: 09/10/2021] [Indexed: 10/20/2022]
Abstract
Previous studies have demonstrated that sleep deprivation results in a negativity bias, especially in the context of impaired response inhibition. In the present study we investigated spontaneous eye blink rate (EBR), a correlate of dopamine function, as a mediator of the relationship between subjective sleepiness and impulsivity toward negative stimuli on a Go/NoGo task. Participants rated their sleepiness on a number of measures including the Epworth Sleepiness Scale (ESS), the Karolinska Sleepiness Scale (KSS) and subscales of the Chronic Sleep Reduction Questionnaire (CSRQ). The findings revealed that EBR mediated the relationship between sleepiness as measured by the Karolinska Sleepiness Scale (KSS) and commission errors on negatively valanced stimuli. These findings suggest that reduced inhibition in responding to negative stimuli can be found as a function of subjective sleepiness and that changes in dopamine function may be one contributing factor explaining this relationship.
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Affiliation(s)
- Hilary E Stebbins
- Department of Psychological Science, University of Mary Washington, USA.
| | - Megan E Jacobs
- Department of Psychological Science, University of Mary Washington, USA
| | | | - Erin N Kaila
- Department of Psychological Science, University of Mary Washington, USA
| | - Mollie M Rhoades
- Department of Psychological Science, University of Mary Washington, USA
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Magliacano A, Fiorenza S, Estraneo A, Trojano L. Eye blink rate increases as a function of cognitive load during an auditory oddball paradigm. Neurosci Lett 2020; 736:135293. [PMID: 32771601 DOI: 10.1016/j.neulet.2020.135293] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 05/08/2020] [Accepted: 08/03/2020] [Indexed: 01/21/2023]
Abstract
Previous evidence suggests that changes in spontaneous eye blink rate (EBR) in human adults might reflect the amount of attentional demand (i.e. cognitive load) during cognitive tasks. However, the actual direction of this relation is uncertain, since most studies investigated the role of cognitive load on EBR by employing visual tasks only. Here we aimed at elucidating the relationship between EBR and cognitive load in non-visual tasks. Sixteen healthy participants performed two auditory oddball tasks, i.e. passive listening to auditory tones versus active counting of target tones; each oddball task was immediately followed by a rest phase. Throughout the oddball tasks we assessed EBR and recorded the P300 on ERPs as an electrophysiological measure of attention. The results showed that participants' EBR increased during the active task compared to the respective rest phase. Amplitude and latency of the P300 too differed between passive and active tasks, but changes in EBR and P300 features were not correlated with each other. Our findings demonstrated that an increase in cognitive load is associated with an increase in EBR in cognitive tasks not involving visual attention. These findings are consistent with previous evidence suggesting shared neurobiological bases between attention and EBR.
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Affiliation(s)
- Alfonso Magliacano
- Department of Psychology, University of Campania "Luigi Vanvitelli", Caserta, Italy.
| | - Salvatore Fiorenza
- Istituti Clinici Scientifici Maugeri IRCCS, SB S.p.A., Laboratorio di Valutazione Multimodale dei Disordini della Coscienza, Telese Terme BN, Italy
| | | | - Luigi Trojano
- Department of Psychology, University of Campania "Luigi Vanvitelli", Caserta, Italy
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Zhang T, Yu L, Han X. The interaction effect between dopamine and task difficulty: Spontaneous eye blink rates diversely relate with Nogo-N2 across various task difficulties. Int J Psychophysiol 2020; 150:1-10. [PMID: 31996297 DOI: 10.1016/j.ijpsycho.2020.01.008] [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] [Received: 05/09/2019] [Revised: 07/30/2019] [Accepted: 01/23/2020] [Indexed: 11/26/2022]
Abstract
Nogo- N2 and P3 are the two major components in the neural time course of response inhibition (RI) and are both related, albeit differently, to dopamine (DA). However, contradictory results from previous studies imply that there may be an interaction effect between DA and task difficulty on the neural time course of RI. To investigate this, we assessed the correlation between spontaneous eye blink rate (EBR) and N2/P3 elicited by the Go/Nogo tasks across various task difficulties, manipulated by the Nogo-stimuli probability (NP) and Go-stimuli response deadline (RTD). In experiment 1, there were two conditions, low (20%) and high (40%) NP, both of which were fixed on an RTD of 1000 ms. We found that higher EBR was significantly related to a more negative Nogo-N2 amplitude. In experiment 2, there were also two conditions, long (1000 ms) and short (300 ms) RTD, both of which were fixed on an NP of 20%. We found that higher EBR was significantly related to more negative Nogo-N2 amplitude in both conditions, however, there was no significant correlation between EBR and P3 in both of the experiments. These results confirmed the interaction effect between DA and task difficulty on the neural course of the Go/Nogo task. This suggests that task difficulty should be considered in future studies that investigate the influence of DA on RI.
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Affiliation(s)
- Ting Zhang
- School of Psychology, Southwest University, Chongqing, China.
| | - Lurong Yu
- College of Traditional Chinese Medicine, Chongqing Medical University, Chongqing, China
| | - Xianzhong Han
- Department of pharmacy, Chongqing General Hospital, UCAS, Chongqing, China
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Kobald SO, Wascher E, Heppner H, Getzmann S. Eye blinks are related to auditory information processing: evidence from a complex speech perception task. PSYCHOLOGICAL RESEARCH 2018; 83:1281-1291. [DOI: 10.1007/s00426-017-0952-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Accepted: 11/23/2017] [Indexed: 10/18/2022]
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Bluschke A, von der Hagen M, Papenhagen K, Roessner V, Beste C. Conflict processing in juvenile patients with neurofibromatosis type 1 (NF1) and healthy controls - Two pathways to success. NEUROIMAGE-CLINICAL 2017; 14:499-505. [PMID: 28289600 PMCID: PMC5338893 DOI: 10.1016/j.nicl.2017.02.014] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Revised: 02/10/2017] [Accepted: 02/17/2017] [Indexed: 01/11/2023]
Abstract
Neurofibromatosis Type 1 (NF1) is a monogenetic autosomal-dominant disorder with a broad spectrum of clinical symptoms and is commonly associated with cognitive deficits. Patients with NF1 frequently exhibit cognitive impairments like attention problems, working memory deficits and dysfunctional inhibitory control. The latter is also relevant for the resolution of cognitive conflicts. However, it is unclear how conflict monitoring processes are modulated in NF1. To examine this question in more detail, we used a system neurophysiological approach combining high-density ERP recordings with source localisation analyses in juvenile patients with NF1 and controls during a flanker task. Behaviourally, patients with NF1 perform significantly slower than controls. Specifically on trials with incompatible flanker-target pairings, however, the patients with NF1 made significantly fewer errors than healthy controls. Yet, importantly, this overall successful conflict resolution was reached via two different routes in the two groups. The healthy controls seem to arrive at a successful conflict monitoring performance through a developing conflict recognition via the N2 accompanied by a selectively enhanced N450 activation in the case of perceived flanker-target conflicts. The presumed dopamine deficiency in the patients with NF1 seems to result in a reduced ability to process conflicts via the N2. However, NF1 patients show an increased N450 irrespective of cognitive conflict. Activation differences in the orbitofrontal cortex (BA11) and anterior cingulate cortex (BA24) underlie these modulations. Taken together, juvenile patients with NF1 and juvenile healthy controls seem to accomplish conflict monitoring via two different cognitive neurophysiological pathways.
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Affiliation(s)
- Annet Bluschke
- Cognitive Neurophysiology, Department of Child and Adolescent Psychiatry, Faculty of Medicine to the TU Dresden, Germany
| | - Maja von der Hagen
- Abteilung Neuropädiatrie, Medizinische Fakultät Carl Gustav Carus, Technische Universität Dresden, Germany
| | - Katharina Papenhagen
- Cognitive Neurophysiology, Department of Child and Adolescent Psychiatry, Faculty of Medicine to the TU Dresden, Germany
| | - Veit Roessner
- Cognitive Neurophysiology, Department of Child and Adolescent Psychiatry, Faculty of Medicine to the TU Dresden, Germany
| | - Christian Beste
- Cognitive Neurophysiology, Department of Child and Adolescent Psychiatry, Faculty of Medicine to the TU Dresden, Germany; Experimental Neurobiology, National Institute of Mental Health, Czech Republic, Germany
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Zhang T, Zhang Q, Wang C, Chen A. The developmental relationship between central dopaminergic level and response inhibition from late childhood to young adulthood. Int J Psychophysiol 2017; 116:53-59. [PMID: 28219681 DOI: 10.1016/j.ijpsycho.2017.02.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Revised: 02/13/2017] [Accepted: 02/15/2017] [Indexed: 11/16/2022]
Abstract
Dopamine (DA) is known to modulate response inhibition (RI). In contrast to the abundant adult studies, only few developmental studies have focused on this topic. Moreover, the mechanism underlying the modulation of RI by the DA system from childhood to adulthood remains unclear. We aimed to assess whether the relationship between DA and RI during late childhood and young adulthood is similar. Accordingly, DA function was measured using the spontaneous eye blink rate (EBR), whereas RI ability was tested using the Go/Nogo task. Experiment 1 included 149 adults (age range, 18-25years) who completed the EBR test and the Go/Nogo task; the results showed that higher EBR was associated with lower commission error in the Nogo trials. Experiment 2 included 45 children (age range, 10-12years) and 37 adults (age range, 18-19years) who completed the EBR test and Go/Nogo tasks (similar to experiment 1); in both the child and adult groups, higher EBR was related to better RI ability. As EBR is closely related to central DA function, these findings suggest that DA plays a similar role in the processing of RI in late childhood and young adulthood.
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Affiliation(s)
- Ting Zhang
- School of Psychology, Southwest University, Chongqing, China.
| | - Qin Zhang
- School of Political Science and Public Administration, University of Electronic Science and Technology of China, China
| | - Cuicui Wang
- State Key Lab of Cognitive Neuroscience and Learning & IDG/McGovern Institute for Brain Research, Beijing Normal University, Beijing, China
| | - Antao Chen
- School of Psychology, Southwest University, Chongqing, China.
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