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Rivera-Lares K, Baddeley A, Della Sala S. Influence of degree of learning on rate of forgetting of tonal sequences. Mem Cognit 2024:10.3758/s13421-024-01597-6. [PMID: 39020063 DOI: 10.3758/s13421-024-01597-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/19/2024] [Indexed: 07/19/2024]
Abstract
Initial performance is frequently equated in studies that compare forgetting rates across groups. However, since the encoding capacity of different groups can be different, some procedures to match initial degree of learning need to be implemented, adding confounding variables such as longer exposures to the material, which would create memories of a different age. Slamecka and McElree Journal of Experimental Psychology: Learning, Memory, and Cognition, 9, 384-397, (1983) and our previous work found that the rate of forgetting was independent from initial degree of learning using verbal material. The present study seeks to determine whether this pattern holds true when undertaken with nonverbal material. In two experiments, we manipulate initial degree of learning by varying the number of presentations of the material and studying the effect on the forgetting rates. A set of 30 tonal sequences were presented to young, healthy participants either once or three times. Forgetting was evaluated in a yes/no recognition paradigm immediately and 1 hour or 24 hours after the study phase. A different subset of 10 sequences was tested along with 10 nontargets at each retention interval. The results of these experiments showed that initial acquisition was modulated by the number of repetitions. However, the forgetting rates were independent of initial degree of learning. These results are in keeping with the pattern found by Slamecka and McElree, and in our own previous studies. They suggest that the pattern of parallel forgetting after different levels of initial learning is not limited to verbal material.
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Affiliation(s)
- Karim Rivera-Lares
- Human Cognitive Neuroscience, Psychology Department, University of Edinburgh, Edinburgh, UK.
| | - Alan Baddeley
- Department of Psychology, University of York, Heslington, York, UK
| | - Sergio Della Sala
- Human Cognitive Neuroscience, Psychology Department, University of Edinburgh, Edinburgh, UK.
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2
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Studer M, Guggisberg AG, Gyger N, Gutbrod K, Henke K, Heinemann D. Accelerated long-term forgetting in patients with acquired brain injury. Brain Inj 2024; 38:377-389. [PMID: 38385560 DOI: 10.1080/02699052.2024.2311349] [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: 03/29/2023] [Accepted: 01/24/2024] [Indexed: 02/23/2024]
Abstract
OBJECTIVE Recent research suggests that patients with neurological disorders without overt seizures may also experience accelerated long-term forgetting (ALF). This term describes unimpaired learning and memory performance after standard retention intervals, but an excessive rate of forgetting over delays of days or weeks. The objective of this retrospective study was to investigate ALF in patients with an acquired brain injury (ABI) and to associate memory performance with executive functions. METHODS Verbal memory performance (short-term recall, 30-min recall, 1-week recall) was assessed in 34 adult patients with ABI and compared to a healthy control group (n = 54) using an auditory word learning and memory test. RESULTS Repeated measure analysis showed significant effects of time and group as well as interaction effects between time and group regarding recall and recognition performance. Patients with ABI had a significantly impaired 1-week recall and recognition performance compared to the healthy control group. Correlations between recall performance and executive functions were nonsignificant. DISCUSSION Our results demonstrate that non-epileptic patients with ABI, especially patients with frontal and fronto-temporal lesions, are prone to ALF. Additionally, our data support the assumption that ALF results from a consolidation impairment since verbal recall and recognition were impaired in patients with ABI.
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Affiliation(s)
- M Studer
- Department of Pediatric Neurology and Developmental Medicine, University Children's Hospital Basel (UKBB), Basel, Switzerland
- Department of Neurology, Inselspital, Bern University Hospital, and University of Bern, Bern, Switzerland
| | - A G Guggisberg
- Department of Neurology, Inselspital, Bern University Hospital, and University of Bern, Bern, Switzerland
| | - N Gyger
- Department of Neurology, Inselspital, Bern University Hospital, and University of Bern, Bern, Switzerland
| | - K Gutbrod
- Neurozentrum Bern, Bern, Switzerland
| | - K Henke
- Institute of Psychology, University of Bern, Bern, Switzerland
| | - D Heinemann
- Department of Neurology, Inselspital, Bern University Hospital, and University of Bern, Bern, Switzerland
- Department of Neurology, Cantonal Hospital Aarau, Aarau, Switzerland
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3
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Mayor C, Moser C, Korff C. Long-term memory consolidation of new words in children with self-limited epilepsy with centro-temporal spikes. Epilepsy Behav 2024; 153:109720. [PMID: 38428174 DOI: 10.1016/j.yebeh.2024.109720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Revised: 02/21/2024] [Accepted: 02/22/2024] [Indexed: 03/03/2024]
Abstract
Accelerated long-term forgetting has been studied and demonstrated in adults with epilepsy. In contrast, the question of long-term consolidation (delays > 1 day) in children with epilepsy shows conflicting results. However, childhood is a period of life in which the encoding and long-term storage of new words is essential for the development of knowledge and learning. The aim of this study was therefore to investigate long-term memory consolidation skills in children with self-limited epilepsy with centro-temporal spikes (SeLECTS), using a paradigm exploring new words encoding skills and their long-term consolidation over one-week delay. As lexical knowledge, working memory skills and executive/attentional skills has been shown to contribute to long-term memory/new word learning, we added standardized measures of oral language and executive/attentional functions to explore the involvement of these cognitive skills in new word encoding and consolidation. The results showed that children with SeLECTS needed more repetitions to encode new words, struggled to encode the phonological forms of words, and when they finally reached the level of the typically developing children, they retained what they had learned, but didn't show improved recall skills after a one-week delay, unlike the control participants. Lexical knowledge, verbal working memory skills and phonological skills contributed to encoding and/or recall abilities, and interference sensitivity appeared to be associated with the number of phonological errors during the pseudoword encoding phase. These results are consistent with the functional model linking working memory, phonology and vocabulary in a fronto-temporo-parietal network. As SeLECTS involves perisylvian dysfunction, the associations between impaired sequence storage (phonological working memory), phonological representation storage and new word learning are not surprising. This dual impairment in both encoding and long-term consolidation may result in large learning gap between children with and without epilepsy. Whether these results indicate differences in the sleep-induced benefits required for long-term consolidation or differences in the benefits of retrieval practice between the epilepsy group and healthy children remains open. As lexical development is associated with academic achievement and comprehension, the impact of such deficits in learning new words is certainly detrimental.
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Affiliation(s)
- C Mayor
- Child Neuropsychology Unit, Faculty of Psychology and Educational Sciences, University of Geneva, Switzerland.
| | - C Moser
- Child Neuropsychology Unit, Faculty of Psychology and Educational Sciences, University of Geneva, Switzerland
| | - C Korff
- Pediatric Neurology Unit, University Hospitals of Geneva, Geneva, Switzerland
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4
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Della Sala S, Baddeley A, Peng N, Logie R. Assessing long-term forgetting: A pragmatic approach. Cortex 2024; 170:80-89. [PMID: 38097498 DOI: 10.1016/j.cortex.2023.11.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Accepted: 11/20/2023] [Indexed: 01/09/2024]
Affiliation(s)
- Sergio Della Sala
- Human Cognitive Neuroscience, Psychology Department, University of Edinburgh, UK.
| | - Alan Baddeley
- Department of Psychology, University of York, Heslington, York, UK
| | - Nan Peng
- Human Cognitive Neuroscience, Psychology Department, University of Edinburgh, UK
| | - Robert Logie
- Human Cognitive Neuroscience, Psychology Department, University of Edinburgh, UK
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5
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Steimel SA, Meisenhelter S, Quon RJ, Camp EJ, Tom R, Bujarski KA, Testorf ME, Song Y, Roth RM, Jobst BC. Accelerated long-term forgetting of recall and recognition memory in people with epilepsy. Epilepsy Behav 2023; 141:109152. [PMID: 36893721 DOI: 10.1016/j.yebeh.2023.109152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2022] [Revised: 02/17/2023] [Accepted: 02/19/2023] [Indexed: 03/11/2023]
Abstract
PURPOSE Persons with epilepsy (PWE) report memory deficits as one of the most distressing aspects of their disorder. Recently, a long-term memory deficit known as Accelerated Long-Term Forgetting (ALF) has been described in PWE. ALF is characterized by the initial retention of learned information, followed by an accelerated rate of memory decay. However, the rate of ALF varies widely across literature and it is unclear how it impacts different memory retrieval types. The current study aimed to capture the time course of ALF on both free recall and recognition memory using a movie-based task in PWE. METHODS A sample of 30 PWE and 30 healthy comparison (HC) subjects watched a nature documentary and were tested on their recall and recognition of the film's content immediately after viewing and at delays of 24 hours, 48 hours, and 72 hours. Participants also rated the confidence they had in their recognition memory trial responses. RESULTS For recall, PWE exhibit ALF at 72 hours (β = -19.840, SE = 3.743, z(226) = -5.301, p < 0.001). For recognition, PWE had decreased performance compared to controls at the 24-hour (β = -10.165, SE = 4.174, z(224) = -3.166, p = 0.004), 48-hour (β = -8.113, SE = 3.701, z(224) = -2.195, p = 0.044), and 72-hour (β = -10.794, SE = 3.017, z(224) = -3.295, p = 0.003) delays. The PWE group showed positive correlations (tau = 0.165, p < 0.001) between confidence ratings and accuracy, with higher confidence reflecting successful recognition. PWE were 49% less likely to answer either retrieval type correctly at 72 hours (OR 0.51, 95% CI [0.35, 0.74], p < 0.001). Left hemispheric seizure onset decreased the odds of successful retrieval by 88% (OR 0.12, 95% CI [0.01, 0.42], p = 0.019). CONCLUSIONS These findings provide evidence of ALF in PWE, with a differential impact on recall and recognition memory. This further supports the call to include ALF assessments in standard memory evaluations in PWE. Additionally, identifying the neural correlates of ALF in the future will be important in developing targeted therapies to alleviate the burden of memory impairment for PWE.
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Affiliation(s)
- Sarah A Steimel
- Dartmouth College Geisel School of Medicine, 1 Rope Ferry Rd, Hanover, NH 03755, USA.
| | - Stephen Meisenhelter
- Department of Neurology, Dartmouth Hitchcock Medical Center, 1 Medical Center Dr, Lebanon, NH 03766, USA.
| | - Robert J Quon
- Dartmouth College Geisel School of Medicine, 1 Rope Ferry Rd, Hanover, NH 03755, USA
| | - Edward J Camp
- Department of Neurology, Dartmouth Hitchcock Medical Center, 1 Medical Center Dr, Lebanon, NH 03766, USA
| | - Rebecca Tom
- Dartmouth College Geisel School of Medicine, 1 Rope Ferry Rd, Hanover, NH 03755, USA
| | - Krzysztof A Bujarski
- Dartmouth College Geisel School of Medicine, 1 Rope Ferry Rd, Hanover, NH 03755, USA; Department of Neurology, Dartmouth Hitchcock Medical Center, 1 Medical Center Dr, Lebanon, NH 03766, USA.
| | - Markus E Testorf
- Thayer School of Engineering at Dartmouth College, 15 Thayer Dr, Hanover, NH 03755, USA.
| | - Yinchen Song
- Dartmouth College Geisel School of Medicine, 1 Rope Ferry Rd, Hanover, NH 03755, USA; Department of Neurology, Dartmouth Hitchcock Medical Center, 1 Medical Center Dr, Lebanon, NH 03766, USA.
| | - Robert M Roth
- Dartmouth College Geisel School of Medicine, 1 Rope Ferry Rd, Hanover, NH 03755, USA; Neuropsychology Program, Department of Psychiatry, Dartmouth Hitchcock Medical Center, 1 Medical Center Dr, Lebanon, NH 03766, USA.
| | - Barbara C Jobst
- Dartmouth College Geisel School of Medicine, 1 Rope Ferry Rd, Hanover, NH 03755, USA; Department of Neurology, Dartmouth Hitchcock Medical Center, 1 Medical Center Dr, Lebanon, NH 03766, USA.
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6
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Rodini M, De Simone MS, Caltagirone C, Carlesimo GA. Accelerated long-term forgetting in neurodegenerative disorders: A systematic review of the literature. Neurosci Biobehav Rev 2022; 141:104815. [PMID: 35961382 DOI: 10.1016/j.neubiorev.2022.104815] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 07/29/2022] [Accepted: 08/01/2022] [Indexed: 11/19/2022]
Abstract
Accelerated Long-term Forgetting (ALF) is a memory deficit characterised by normal retention up to relatively short intervals (e.g., minutes, hours) with increased forgetting over longer periods (e.g., days, weeks). ALF is often underestimated due to a lack of common memory assessments beyond 30-60 min. The purpose of this review was to provide an overview of ALF occurrence in neurodegenerative disorders, evaluating whether it can be considered a cognitive deficit useful for diagnosing and monitoring patients. We included 19 experimental studies that investigated ALF in neurodegenerative disorders. Most papers were focused on Alzheimer's disease (AD) dementia and related forms of cognitive decline (Mild Cognitive Impairment, Subjective Cognitive decline, Pre-symptomatic subjects at risk of AD dementia). The major finding of the present work concerns the presence of ALF in very early forms of cognitive decline related to AD. These findings, supporting the hypothesis that ALF is a subtle and undetected hallmark of pre-clinical AD, highlights the importance of investigating forgetting over a longer period and devising standardised measures to be included in clinical practice.
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Affiliation(s)
- Marta Rodini
- Laboratory of Neuropsychology of Memory, Department of Clinical and Behavioural Neurology, Santa Lucia Foundation IRCCS, Rome, Italy.
| | - Maria Stefania De Simone
- Laboratory of Neuropsychology of Memory, Department of Clinical and Behavioural Neurology, Santa Lucia Foundation IRCCS, Rome, Italy
| | - Carlo Caltagirone
- Laboratory of Neuropsychology of Memory, Department of Clinical and Behavioural Neurology, Santa Lucia Foundation IRCCS, Rome, Italy
| | - Giovanni Augusto Carlesimo
- Laboratory of Neuropsychology of Memory, Department of Clinical and Behavioural Neurology, Santa Lucia Foundation IRCCS, Rome, Italy; Department of Systems Medicine, Tor Vergata University, Rome, Italy
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7
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Bouyer C, de Toffol B. Case Report: Cognitive Assessment Before an Amnesic Seizure in Transient Epileptic Amnesia Syndrome. Front Neurol 2022; 13:919706. [PMID: 35860486 PMCID: PMC9289512 DOI: 10.3389/fneur.2022.919706] [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: 04/13/2022] [Accepted: 06/09/2022] [Indexed: 11/13/2022] Open
Abstract
A patient with transient epileptic amnesia syndrome presented a clinically observable amnesic seizure immediately after a neuropsychological assessment. An hour and a half before the onset of the seizure, the patient progressively developed an isolated alteration of episodic memory. These data question the ictal/interictal distinction in this syndrome as well as the speed of propagation of an epileptic activity.
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Affiliation(s)
- Coline Bouyer
- Service de neurologie Centre Hospitalier de Cayenne, Cayenne, France
- *Correspondence: Coline Bouyer
| | - Bertrand de Toffol
- Service de neurologie Centre Hospitalier de Cayenne, Cayenne, France
- CIC Inserm 1424 CH Cayenne, Cayenne, France
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8
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McGibbon T, Jansari A, Demirjian J, Nemes A, Opre A. EXPRESS: Accelerated forgetting in healthy older samples: implications for methodology, future ageing studies and early identification of risk of dementia. Q J Exp Psychol (Hove) 2022; 76:1347-1367. [PMID: 35786222 DOI: 10.1177/17470218221113412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Accelerated long-term forgetting (ALF) has been reported in healthy older individuals, and is a possible early marker for risk of developing Alzheimer's disease (AD). The Verbal Associative Learning & Memory Test (VALMT; McGibbon & Jansari, 2013) addresses methodological weaknesses in existing clinical tests and has detected ALF in epilepsy within an hour. We used VALMT to investigate learning and forgetting in healthy older participants. Older (60-69yrs) and Younger (19-31yrs) participants were compared. Using VALMT, unrelated word-pairs were learnt to criterion, then cued-recall tested at delays of 5, 30 and 55 minutes. Unique pairs were tested at each delay. Subjective memory complaints data was gathered, and the Wechsler Memory Scale Logical Memory test (WMS-LM; a standard clinical measure) was administered. VALMT identified a significant difference in delayed recall between Younger and Older groups by 55 minutes (d = 1.32). While 'fast-learning' Older participants scored similarly to Younger participants, 'slow-learning' Older participants were impaired at all delays. Forgetting rates suggested degradation of memory starts during early synaptic consolidation rather than later system-level consolidation. Increased subjective memory complaints were associated with reduced VALMT scores. By contrast, WMS-LM failed to identify significant differences between any groups, and did not correlate with memory complaints. We conclude VALMT may be better able than WMS-LM to identify subtle impairments in healthy older adults within a single clinical visit, and VALMT results better reflect subjective experience. Older slow-learners forget faster and report more subjective memory complaints, which may indicate a group at risk of developing AD.
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Affiliation(s)
- Terence McGibbon
- Department of Psychology, Goldsmiths University of London, United Kingdom 4898
| | - Ashok Jansari
- Department of Psychology, Goldsmiths University of London, United Kingdom 4898
| | - Jessica Demirjian
- Department of Psychology, Goldsmiths University of London, United Kingdom 4898
| | - Ana Nemes
- Department of Psychology, Goldsmiths University of London, United Kingdom 4898
| | - Adrian Opre
- Psychology Department, Babes-Bolyai University, Cluj-Napoca, Romania 54741
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9
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Savage SA, Baker J, Milton F, Butler C, Zeman A. Clinical outcomes in Transient Epileptic Amnesia: a 10-year follow-up cohort study of 47 cases. Epilepsia 2022; 63:1115-1129. [PMID: 35253220 PMCID: PMC9310913 DOI: 10.1111/epi.17214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 02/08/2022] [Accepted: 03/03/2022] [Indexed: 11/27/2022]
Abstract
Objective Transient epileptic amnesia (TEA) is a form of adult‐onset epilepsy where presenting features are well described, but little is known regarding prognosis. This study aimed to elucidate the long‐term prognosis of TEA regarding seizure control, memory, medical comorbidities, and life expectancy. Methods Up‐to‐date clinical information was collected for 47 people diagnosed with TEA who had joined the The Impairment of Memory in Epilepsy (TIME) study 10 years earlier. At entry to the study, information about comorbid conditions was systematically collected. Details regarding subsequent diagnoses, seizure activity, changes to treatment, or reports of cognitive impairment were obtained through the family doctor. The variables of interest were compared with UK population data. Results Mortality in the cohort was 21 of 47 (45%), with an average age at death of 82.5 years. Seizures remained well controlled for the majority but medications required adjustments in dose and type for some (28%). A small number (three cases) remained seizure‐free without medication. History of cardiovascular disorders was frequent (78.7%), typically involving hypertension (55.3%). Autoimmune disorders (25.5%), cancer (23.4%), and depression (21.3%) were also commonly reported. Although persisting memory problems were often noted, dementia was diagnosed in seven cases (14.9%). Life expectancy and comorbidities in TEA did not differ from available population norms. Significance Results suggest that life expectancy is not reduced in TEA. Although TEA does not appear to be a self‐limiting form of epilepsy, seizures are typically well controlled via medication. Because adjustments to medication may be required, even after long periods of stability, ongoing medical monitoring is recommended. Comorbid vascular disorders are frequent but appear similar to general population estimates. Monitoring mood may be important, given that people with chronic conditions are often vulnerable to depression. Because of persisting memory difficulties, the development of effective memory interventions for people with TEA is warranted.
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Affiliation(s)
- Sharon A Savage
- Cognitive & Behavioural Neurology, University of Exeter Medical School, College House, St Luke's Campus, Exeter, EX1 2LU, UK.,School of Psychological Sciences, University of Newcastle, Callaghan, New South Wales, 2308, Australia
| | - John Baker
- Cognitive & Behavioural Neurology, University of Exeter Medical School, College House, St Luke's Campus, Exeter, EX1 2LU, UK.,Dementia Research Centre, UCL Queen Square institute of Neurology, London, WC1N 3BG, UK
| | - Fraser Milton
- Discipline of Psychology, University of Exeter, Washington Singer Laboratories, Exeter, EX4 4QG, UK
| | - Chris Butler
- Nuffield Department of Clinical Neurosciences, University of Oxford, John Radcliffe Hospital, Oxford, OX3 9DU, UK.,Department of Brain Sciences, Imperial College, London, W12 0NN, UK
| | - Adam Zeman
- Cognitive & Behavioural Neurology, University of Exeter Medical School, College House, St Luke's Campus, Exeter, EX1 2LU, UK
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Alviarez-Schulze V, Cattaneo G, Pachón-García C, Solana-Sánchez J, Tormos JM, Pascual-Leone A, Bartrés-Faz D. Validation and Normative Data of the Spanish Version of the Rey Auditory Verbal Learning Test and Associated Long-Term Forgetting Measures in Middle-Aged Adults. Front Aging Neurosci 2022; 14:809019. [PMID: 35221995 PMCID: PMC8865334 DOI: 10.3389/fnagi.2022.809019] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 01/10/2022] [Indexed: 01/06/2023] Open
Abstract
Rey Auditory Verbal Learning Test (RAVLT) is an episodic memory helpful measure to detect changes associated with abnormal aging. There is a lack of RAVLT validation and normalization studies in Spain. The aim was to determine its psychometric properties and explore long-term forgetting (LTF) performance through 1-week delayed recall under three different modes of administration. The RAVLT was administered to 602 cognitively healthy volunteers, aged between 41 and 65 years, of whom 251 completed the LTF assessment. Findings reveal a factorial structure of four components, with satisfactory goodness of fit, and adequate convergent and divergent validity. We also demonstrated the differential effect of three methodologies used in LTF assessment, supporting that test expectancy positively influences long-term storage. Finally, normative data were generated according to age, sex, and education. The test, including the LTF measure, is a promising tool to estimate memory in middle-aged adults and develop predictive brain aging models.
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Affiliation(s)
- Vanessa Alviarez-Schulze
- Institut Guttmann, Institut Universitari de Neurorehabilitació adscrit a la UAB, Badalona, Spain
- Departament de Medicina, Facultat de Medicina, Universitat Autònoma de Barcelona, Bellaterra, Spain
- Fundació Institut d’Investigació en Ciències de la Salut Germans Trias i Pujol, Badalona, Spain
- Departamento de Ciencias del Comportamiento, Escuela de Psicología, Universidad Metropolitana, Caracas, Venezuela
- *Correspondence: Vanessa Alviarez-Schulze,
| | - Gabriele Cattaneo
- Institut Guttmann, Institut Universitari de Neurorehabilitació adscrit a la UAB, Badalona, Spain
- Fundació Institut d’Investigació en Ciències de la Salut Germans Trias i Pujol, Badalona, Spain
- Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Catherine Pachón-García
- Institut Guttmann, Institut Universitari de Neurorehabilitació adscrit a la UAB, Badalona, Spain
- Departament de Medicina, Facultat de Medicina, Universitat Autònoma de Barcelona, Bellaterra, Spain
- Fundació Institut d’Investigació en Ciències de la Salut Germans Trias i Pujol, Badalona, Spain
| | - Javier Solana-Sánchez
- Institut Guttmann, Institut Universitari de Neurorehabilitació adscrit a la UAB, Badalona, Spain
- Fundació Institut d’Investigació en Ciències de la Salut Germans Trias i Pujol, Badalona, Spain
- Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Josep M. Tormos
- Institut Guttmann, Institut Universitari de Neurorehabilitació adscrit a la UAB, Badalona, Spain
- Fundació Institut d’Investigació en Ciències de la Salut Germans Trias i Pujol, Badalona, Spain
- Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Alvaro Pascual-Leone
- Institut Guttmann, Institut Universitari de Neurorehabilitació adscrit a la UAB, Badalona, Spain
- Hinda and Arthur Marcus Institute for Aging Research and Deanna and Sidney Wolk Center for Memory Health, Hebrew SeniorLife, Boston, MA, United States
- Department of Neurology and Harvard Medical School, Boston, MA, United States
| | - David Bartrés-Faz
- Institut Guttmann, Institut Universitari de Neurorehabilitació adscrit a la UAB, Badalona, Spain
- Departament de Medicina, Facultat de Medicina i Ciències de la Salut, Institut de Neurociències, Universitat de Barcelona, Barcelona, Spain
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11
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Abstract
It is commonly assumed that the rate of forgetting depends on initial degree of learning. Hence, comparison of forgetting across groups is usually carried out equating initial performance. However, these matching procedures add confounding variables. In four experiments, following Slamecka and McElree (1983, Exp 3), we challenge this assumption through manipulating initial acquisition by varying the number of presentations of the material and studying the effect on rate of subsequent forgetting. A set of 36 sentences was presented either visually or auditorily. Different participants were exposed to the material two, four or six times. Forgetting was measured by means of a cued recall test at three time-intervals (30 s, 1 day and 1 week in experiments 1 and 2; 30 s, 1 day, and 3 days in experiments 3 and 4). A different subset of 12 sentences was tested at each delay. The outcome of these experiments showed that the initial acquisition depends on number of learning trials. However, the rate of forgetting proved to be independent of initial acquisition. This pattern remains constant across modalities of presentation and of the number of learning trials. The conclusion is that forgetting does not depend on initial acquisition.
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12
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Lemesle B, Barbeau EJ, Rigal EM, Denuelle M, Valton L, Pariente J, Curot J. Hidden Objective Memory Deficits Behind Subjective Memory Complaints in Patients With Temporal Lobe Epilepsy. Neurology 2021; 98:e818-e828. [PMID: 34906979 DOI: 10.1212/wnl.0000000000013212] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 11/24/2021] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVE To test the hypothesis that temporal lobe epilepsy (TLE) patients with subjective initial memory complaints (not confirmed by an objective standard assessment) and various phenotypes also show objective very long-term memory deficit with accelerated long-term forgetting. We tested TLE patients with two surprise memory tests after three weeks: the standard Free and Cued Selective Reminding Test (FCSRT), and Epireal, a new test specifically designed to capture more ecological aspects of autobiographical memory. METHODS 47 TLE patients (12 hippocampal sclerosis, 12 amygdala enlargement, 11 extensive lesions, 12 normal MRI) who complained about their memory, but for whom the standard neuropsychological assessment did not reveal any memory impairment after a standard delay of 20 minutes, underwent two surprise memory tests after three weeks. They were compared to 35 healthy control subjects. RESULTS After three weeks, FCSRT and Epireal recall scores were significantly lower in patients than in controls (p<0.001). There was no significant correlation between FCSRT and Epireal scores (p=0.99). Seventy-six percent of TLE patients had objective impairment on at least one of these very long-term memory tests, regardless of the existence and type of lesion or response to antiseizure medication. Easily applicable, Epireal had a higher effect size, detected deficits in 28% more patients, and is a useful addition to the standard workup. CONCLUSION Assessing long-term memory should be broadened to a wide spectrum of TLE patients with a memory complaint, regardless of the epileptic syndrome, whether or not associated with a lesion. This could lead to rethinking TLE nosology associated with memory.
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Affiliation(s)
- Béatrice Lemesle
- Department of Cognitive Neurology, Pierre Paul Riquet Hospital, Toulouse University Hospital, Toulouse, France
| | - Emmanuel J Barbeau
- Brain and Cognition Research Center - CerCo, CNRS, UMR5549, Toulouse, France.,Brain and Cognition Research Center, Toulouse University, Paul Sabatier University, Toulouse, France
| | - Emilie Milongo Rigal
- Department of Cognitive Neurology, Pierre Paul Riquet Hospital, Toulouse University Hospital, Toulouse, France
| | - Marie Denuelle
- Brain and Cognition Research Center - CerCo, CNRS, UMR5549, Toulouse, France.,Brain and Cognition Research Center, Toulouse University, Paul Sabatier University, Toulouse, France.,Department of Neurophysiological Explorations, Pierre Paul Riquet Hospital, Toulouse University Hospital, Toulouse, France
| | - Luc Valton
- Brain and Cognition Research Center - CerCo, CNRS, UMR5549, Toulouse, France.,Brain and Cognition Research Center, Toulouse University, Paul Sabatier University, Toulouse, France.,Department of Neurophysiological Explorations, Pierre Paul Riquet Hospital, Toulouse University Hospital, Toulouse, France
| | - Jeremie Pariente
- Department of Cognitive Neurology, Pierre Paul Riquet Hospital, Toulouse University Hospital, Toulouse, France.,INSERM, U1214, TONIC, Toulouse Mind and Brain Institute, Toulouse, France
| | - Jonathan Curot
- Brain and Cognition Research Center - CerCo, CNRS, UMR5549, Toulouse, France .,Brain and Cognition Research Center, Toulouse University, Paul Sabatier University, Toulouse, France.,Department of Neurophysiological Explorations, Pierre Paul Riquet Hospital, Toulouse University Hospital, Toulouse, France
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13
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Lambert I, Tramoni-Negre E, Lagarde S, Pizzo F, Trebuchon-Da Fonseca A, Bartolomei F, Felician O. Accelerated long-term forgetting in focal epilepsy: Do interictal spikes during sleep matter? Epilepsia 2021; 62:563-569. [PMID: 33476422 DOI: 10.1111/epi.16823] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 12/19/2020] [Accepted: 01/05/2021] [Indexed: 12/21/2022]
Abstract
Accelerated long-term forgetting (ALF) is a particular form of amnesia mostly encountered in focal epilepsy, particularly in temporal lobe epilepsy. This type of memory loss is characterized by an impairment of long-term consolidation of declarative memory, and its mechanisms remain poorly understood. In particular, the respective contribution of lesion, seizures, interictal epileptic discharges, and sleep is still debated. Here, we provide an overview of the relationships intertwining epilepsy, sleep, and memory consolidation and, based on recent findings from intracranial electroencephalographic recordings, we propose a model of ALF pathophysiology that integrates the differential role of interictal spikes during wakefulness and sleep. This model provides a framework to account for the different timescales at which ALF may occur.
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Affiliation(s)
- Isabelle Lambert
- System Neurosciences Institute, Aix Marseille University, INSERM, INS, Marseille, France.,Epileptology and Clinical Neurophysiology Department, Timone Hospital, Marseille, France
| | - Eve Tramoni-Negre
- System Neurosciences Institute, Aix Marseille University, INSERM, INS, Marseille, France.,Neurology and Neuropsychology Department, Timone Hospital, Marseille, France
| | - Stanislas Lagarde
- System Neurosciences Institute, Aix Marseille University, INSERM, INS, Marseille, France.,Epileptology and Clinical Neurophysiology Department, Timone Hospital, Marseille, France
| | - Francesca Pizzo
- System Neurosciences Institute, Aix Marseille University, INSERM, INS, Marseille, France.,Epileptology and Clinical Neurophysiology Department, Timone Hospital, Marseille, France
| | - Agnès Trebuchon-Da Fonseca
- System Neurosciences Institute, Aix Marseille University, INSERM, INS, Marseille, France.,Epileptology and Clinical Neurophysiology Department, Timone Hospital, Marseille, France
| | - Fabrice Bartolomei
- System Neurosciences Institute, Aix Marseille University, INSERM, INS, Marseille, France.,Epileptology and Clinical Neurophysiology Department, Timone Hospital, Marseille, France
| | - Olivier Felician
- System Neurosciences Institute, Aix Marseille University, INSERM, INS, Marseille, France.,Neurology and Neuropsychology Department, Timone Hospital, Marseille, France
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14
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A Review of Accelerated Long-Term Forgetting in Epilepsy. Brain Sci 2020; 10:brainsci10120945. [PMID: 33297371 PMCID: PMC7762289 DOI: 10.3390/brainsci10120945] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 11/30/2020] [Accepted: 12/03/2020] [Indexed: 11/16/2022] Open
Abstract
Accelerated long-term forgetting (ALF) is a memory disorder that manifests by a distinct pattern of normal memory for up to an hour after learning, but an increased rate of forgetting during the subsequent hours and days. The topic of ALF has gained much attention in group studies with epilepsy patients and the phenomenon has been shown to have contradictory associations with seizures, epileptiform activity, imaging data, sleep, and antiepileptic medication. The aim of this review was to explore how clinical and imaging data could help determine the topographic and physiological substrate of ALF, and what is the possible use of this information in the clinical setting. We have reviewed 51 group studies in English to provide a synthesis of the existing findings concerning ALF in epilepsy. Analysis of recently reported data among patients with temporal lobe epilepsy, transient epileptic amnesia, and generalized and extratemporal epilepsies provided further indication that ALF is likely a disorder of late memory consolidation. The spatial substrate of ALF might be located along the parts of the hippocampal-neocortical network and novel studies reveal the increasingly possible importance of damage in extrahippocampal sites. Further research is needed to explore the mechanisms of cellular impairment in ALF and to develop effective methods of care for patients with the disorder.
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15
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Lanzone J, Imperatori C, Assenza G, Ricci L, Farina B, Di Lazzaro V, Tombini M. Power Spectral Differences between Transient Epileptic and Global Amnesia: An eLORETA Quantitative EEG Study. Brain Sci 2020; 10:brainsci10090613. [PMID: 32899970 PMCID: PMC7563784 DOI: 10.3390/brainsci10090613] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 08/28/2020] [Accepted: 09/04/2020] [Indexed: 11/23/2022] Open
Abstract
Transient epileptic amnesia (TEA) is a rare epileptic condition, often confused with transient global amnesia (TGA). In a real-life scenario, differential diagnosis between these two conditions can be hard. In this study we use power spectral analysis empowered by exact Low Resolution Brain Electromagnetic Tomography (eLORETA) to evidence the differences between TEA and TGA. Fifteen patients affected by TEA (64.2 ± 5.2 y.o.; 11 female/4 male; 10 left and 5 right temporal epileptic focus) and 15 patients affected by TGA (65.8 ± 7.2 y.o.; 11 females/4 males) were retrospectively identified in our clinical records. All patients recorded EEGs after symptoms offset. EEGs were analyzed with eLORETA to evidence power spectral contrast between the two conditions. We used an inverse problem solution to localize the source of spectral differences. We found a significant increase in beta band power over the affected hemisphere of TEA patients. Significant results corresponded to the uncus and para-hippocampal gyrus, respectively Brodmann’s Areas: 36, 35, 28, 34. We present original evidence of an increase in beta power in the affected hemisphere (AH) of TEA as compared to TGA. These differences involve key areas of the memory network located in the mesial temporal lobe. Spectral asymmetries could be used in the future to recognize cases of amnesia with a high risk of epilepsy.
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Affiliation(s)
- Jacopo Lanzone
- Neurology, Neurophysiology and Neurobiology Unit, Department of Medicine, Università Campus Bio-Medico di Roma, 00128 Rome, Italy; (G.A.); (L.R.); (V.D.L.); (M.T.)
- Correspondence:
| | - Claudio Imperatori
- Cognitive and Clinical Psychology Laboratory, Department of Human Sciences, European University of Rome, Via degli Aldobrandeschi 190, 00163 Rome, Italy; (C.I.); (B.F.)
| | - Giovanni Assenza
- Neurology, Neurophysiology and Neurobiology Unit, Department of Medicine, Università Campus Bio-Medico di Roma, 00128 Rome, Italy; (G.A.); (L.R.); (V.D.L.); (M.T.)
| | - Lorenzo Ricci
- Neurology, Neurophysiology and Neurobiology Unit, Department of Medicine, Università Campus Bio-Medico di Roma, 00128 Rome, Italy; (G.A.); (L.R.); (V.D.L.); (M.T.)
| | - Benedetto Farina
- Cognitive and Clinical Psychology Laboratory, Department of Human Sciences, European University of Rome, Via degli Aldobrandeschi 190, 00163 Rome, Italy; (C.I.); (B.F.)
| | - Vincenzo Di Lazzaro
- Neurology, Neurophysiology and Neurobiology Unit, Department of Medicine, Università Campus Bio-Medico di Roma, 00128 Rome, Italy; (G.A.); (L.R.); (V.D.L.); (M.T.)
| | - Mario Tombini
- Neurology, Neurophysiology and Neurobiology Unit, Department of Medicine, Università Campus Bio-Medico di Roma, 00128 Rome, Italy; (G.A.); (L.R.); (V.D.L.); (M.T.)
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16
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Beilharz JE, Thayer Z, Nikpour A, Lah S. Accelerated long-term forgetting is not evident in adults with genetic generalized epilepsy irrespective of the paradigm used. Epilepsy Behav 2020; 104:106920. [PMID: 32035340 DOI: 10.1016/j.yebeh.2020.106920] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 01/10/2020] [Accepted: 01/17/2020] [Indexed: 10/24/2022]
Abstract
Accelerated long-term forgetting (ALF) is a recently discovered memory disorder characterized by intact acquisition and retention over short delays, followed by abnormally fast rates of forgetting. Accelerated long-term forgetting has been repeatedly found in children, but not in adults, with genetic generalized epilepsy (GGE). It is possible that this discrepancy is due to a difference in paradigms used in these studies. The current study aimed to determine whether adults with GGE displayed ALF using two paradigms, one that required complete learning and another one that did not. In addition, we explored the relationships with everyday memory difficulties, working memory, mood, and epilepsy variables. Fourteen adults with GGE were compared with 16 healthy controls on two verbal memory tests: a modified version of the California Verbal Learning Test learned to a criterion of 100% (complete learning) and Logical Memory from the Wechsler Memory Scale (Fourth Edition) presented only once (incomplete learning). Recall was tested at 2 min, 30 min, and 1 week, and recognition at 1 week only. Working memory, everyday memory, and mood were also assessed. We found no evidence of ALF on either of the two verbal memory paradigms on recall or recognition tests although patients displayed significantly poorer working memory. Moreover, patients with GGE reported significantly more memory difficulties in everyday life, and these were associated with greater mood disturbances but not with memory tests scores. Greater number of antiepileptic drugs and epilepsy severity also related to memory scores on some tests. Our study suggests that a difference in paradigms used to investigate ALF in children and adults with GGE is unlikely to explain the differences in findings. The study tentatively raises a hypothesis that developmental factors may play a role in ALF in patients with GGE; children with GGE may grow out of ALF. Nevertheless, this hypothesis would need to be tested in a longitudinal study that would follow patients from childhood to early adulthood.
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Affiliation(s)
| | - Zoe Thayer
- Neurology Department, Royal Prince Alfred Hospital, Sydney, NSW 2050, Australia
| | - Armin Nikpour
- Neurology Department, Royal Prince Alfred Hospital, Sydney, NSW 2050, Australia
| | - Suncica Lah
- School of Psychology, University of Sydney, Sydney, NSW 2006, Australia.
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17
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Stawarczyk D, Jeunehomme O, D'Argembeau A. Differential Contributions of Default and Dorsal Attention Networks to Remembering Thoughts and External Stimuli From Real-Life Events. Cereb Cortex 2019; 28:4023-4035. [PMID: 29045587 DOI: 10.1093/cercor/bhx270] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Episodic memories are typically composed of perceptual information derived from the external environment and representations of internal states (e.g., one's thoughts during prior episodes). To date, however, research has mostly focused on the remembrance of external stimuli, such that little is known about how internal mentation is represented within episodic memory. In the present fMRI study, we examined the neural correlates of these 2 components of episodic memories using a novel method of cuing memories from photographs taken during real-life events. We found that, compared with corresponding semantic memory tasks, memories for internal thoughts and external elements were associated with activity in brain areas supporting episodic recollection. Most importantly, however, the 2 kinds of memories also showed differential activation in large-scale brain networks: the remembrance of external elements was associated with greater activity in the dorsal attention network, whereas memories of internal thoughts mainly recruited default network areas. These findings shed new light on the representation of internal and external aspects of prior experience within episodic memory. The default network may contribute to the reinstatement of thoughts experienced during past events, whereas the dorsal attention network may support the allocation of attention to visuospatial features within episodic memory representations.
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Affiliation(s)
- David Stawarczyk
- Department of Psychology, Psychology and Neuroscience of Cognition Research Unit, University of Liège, Liège, Belgium
| | - Olivier Jeunehomme
- Department of Psychology, Psychology and Neuroscience of Cognition Research Unit, University of Liège, Liège, Belgium
| | - Arnaud D'Argembeau
- Department of Psychology, Psychology and Neuroscience of Cognition Research Unit, University of Liège, Liège, Belgium.,GIGA-CRC In Vivo Imaging, University of Liège, Liège, Belgium
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18
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Drew CJG, Postans M, Petralia C, McNamara R, Pallmann P, Gillespie D, Evans LH, Muhlert N, Winter M, Hamandi K, Gray WP. A protocol for a randomised controlled, double-blind feasibility trial investigating fluoxetine treatment in improving memory and learning impairments in patients with mesial temporal lobe epilepsy: Fluoxetine, Learning and Memory in Epilepsy (FLAME trial). Pilot Feasibility Stud 2019; 5:87. [PMID: 31321071 PMCID: PMC6612194 DOI: 10.1186/s40814-019-0474-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Accepted: 06/26/2019] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND People with temporal lobe epilepsy (TLE) report significant problems with learning and memory. There are no effective therapies for combatting these problems in people with TLE, resulting in an unmet therapeutic need. The lack of treatment is, in part, due to a poor understanding of the neurobiology underlying these memory deficits. We know that hippocampal neurogenesis, a process believed to be important in learning and memory formation, is permanently reduced in chronic TLE, and this may go some way to explain the learning and memory impairments seen in people with TLE.The common anti-depressant drug fluoxetine has been shown to stimulate neurogenesis both in the healthy brain and in neurological diseases where neurogenesis is impaired. In an animal model of TLE, administration of fluoxetine was found to restore neurogenesis and improve learning on a complex spatial navigational task. We now want to test this effect in humans by investigating whether administration of fluoxetine to people with TLE can improve learning and memory. METHODS This is a single-centre randomised controlled, double-blind feasibility trial. We plan to recruit 20 participants with a diagnosis of TLE and uni-lateral hippocampal sclerosis, confirmed by 3T MRI. Eligible participants will undergo baseline assessments of learning and memory prior to being randomised to either 20 mg/day fluoxetine or matching placebo for 60 days. Follow-up assessments will be conducted after 60 days of trial medication and then again at 60 days after cessation of trial medication. Feasibility will be assessed on measures of recruitment, retention and adherence against pre-determined criteria. DISCUSSION This trial is designed to determine the feasibility of conducting a double-blind randomised controlled trial of fluoxetine for the treatment of learning and memory impairments in people with TLE. Data collected in this trial will inform the design and utility of any future efficacy trial involving fluoxetine for the treatment of learning and memory in people with TLE. TRIAL REGISTRATION EudraCT 2014-005088-34, registered on May 18, 2015.
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Affiliation(s)
- Cheney J. G. Drew
- Centre for Trials Research, Cardiff University, Heath Park, Cardiff, CF14 4YS UK
| | - Mark Postans
- Cardiff University Brain Research Imaging Centre (CUBRIC), Maindy Road, Cardiff, CF24 4HQ UK
- School of Psychology, Cardiff University, Tower Building, 70 Park Place, Cardiff, CF10 3AT UK
| | - Cateno Petralia
- Division of Psychological Medicine and Clinical Neurosciences, University Hospital Wales, Cardiff and Vale University Health Board, Heath Park, Cardiff, CF14 4XW UK
| | - Rachel McNamara
- Centre for Trials Research, Cardiff University, Heath Park, Cardiff, CF14 4YS UK
| | - Philip Pallmann
- Centre for Trials Research, Cardiff University, Heath Park, Cardiff, CF14 4YS UK
| | - Dave Gillespie
- Centre for Trials Research, Cardiff University, Heath Park, Cardiff, CF14 4YS UK
| | - Lisa H. Evans
- Cardiff University Brain Research Imaging Centre (CUBRIC), Maindy Road, Cardiff, CF24 4HQ UK
- School of Psychology, Cardiff University, Tower Building, 70 Park Place, Cardiff, CF10 3AT UK
| | - Nils Muhlert
- School of Psychology, Cardiff University, Tower Building, 70 Park Place, Cardiff, CF10 3AT UK
- Division of Neuroscience and Experimental Psychology, Manchester University, Manchester, UK
| | - Mia Winter
- School of Psychology, Cardiff University, Tower Building, 70 Park Place, Cardiff, CF10 3AT UK
- Department of Clinical Neuropsychology, University Hospital Wales, Cardiff, CF14 4XW UK
| | - Khalid Hamandi
- Cardiff University Brain Research Imaging Centre (CUBRIC), Maindy Road, Cardiff, CF24 4HQ UK
- The Alan Richens Welsh Epilepsy Centre, University Hospital Wales, Cardiff, CF144XW UK
| | - William P. Gray
- Division of Psychological Medicine and Clinical Neurosciences, University Hospital Wales, Cardiff and Vale University Health Board, Heath Park, Cardiff, CF14 4XW UK
- Neuroscience and Mental Health Research Institute, Hadyn Ellis Building, Maindy Road, Cardiff, CF24 4HQ UK
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19
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Have we forgotten about forgetting? A critical review of ‘accelerated long-term forgetting’ in temporal lobe epilepsy. Cortex 2019; 110:141-149. [DOI: 10.1016/j.cortex.2017.12.012] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2017] [Revised: 08/29/2017] [Accepted: 12/12/2017] [Indexed: 01/29/2023]
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20
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Accelerated long-term forgetting in resected and seizure-free temporal lobe epilepsy patients. Cortex 2019; 110:80-91. [DOI: 10.1016/j.cortex.2018.02.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 01/17/2018] [Accepted: 02/27/2018] [Indexed: 11/19/2022]
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21
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Mayes AR, Hunkin NM, Isaac C, Muhlert N. Are there distinct forms of accelerated forgetting and, if so, why? Cortex 2019; 110:115-126. [DOI: 10.1016/j.cortex.2018.04.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Revised: 09/05/2017] [Accepted: 04/08/2018] [Indexed: 12/14/2022]
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22
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Audrain S, McAndrews MP. Cognitive and functional correlates of accelerated long-term forgetting in temporal lobe epilepsy. Cortex 2019; 110:101-114. [DOI: 10.1016/j.cortex.2018.03.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 12/24/2017] [Accepted: 03/19/2018] [Indexed: 02/07/2023]
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23
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Grayson-Collins J, Gascoigne MB, Barton B, Webster R, Gill D, Lah S. Longitudinal study of accelerated long-term forgetting in children with genetic generalized epilepsy: Evidence of ongoing deficits. Cortex 2019; 110:5-15. [DOI: 10.1016/j.cortex.2017.08.028] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 07/21/2017] [Accepted: 08/22/2017] [Indexed: 02/07/2023]
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24
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Accelerated long-term forgetting after TIA or minor stroke: A more sensitive measure for detecting subtle memory dysfunction? Cortex 2019; 110:150-156. [DOI: 10.1016/j.cortex.2018.04.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 12/04/2017] [Accepted: 04/03/2018] [Indexed: 11/19/2022]
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25
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Hoefeijzers S, Zeman A, Della Sala S, Dewar M. Capturing real-life forgetting in transient epileptic amnesia via an incidental memory test. Cortex 2019; 110:47-57. [DOI: 10.1016/j.cortex.2017.11.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2017] [Revised: 10/30/2017] [Accepted: 11/30/2017] [Indexed: 02/08/2023]
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26
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Lanzone J, Ricci L, Assenza G, Ulivi M, Di Lazzaro V, Tombini M. Transient epileptic and global amnesia: Real-life differential diagnosis. Epilepsy Behav 2018; 88:205-211. [PMID: 30296664 DOI: 10.1016/j.yebeh.2018.07.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2018] [Revised: 07/20/2018] [Accepted: 07/21/2018] [Indexed: 11/30/2022]
Abstract
OBJECTIVE Transient epileptic amnesia (TEA) is an underestimated condition in emergency clinical setting, where most of transient amnesic episodes tend to be classified as transient global amnesia (TGA). We designed this study to evaluate the actual frequency of TEA in a real-life scenario and to highlight the features that can help clinicians distinguishing it from TGA. METHODS We retrospectively collected clinical data of 83 patients who accessed our emergency ward for an abrupt onset of amnesic disorder, initially interpreted as TGA. All patients underwent neurological evaluation, magnetic resonance imaging (MRI) scan, and standard 21-channel scalp electroencephalography (EEG) recording (standard EEG [st-EEG]). Moreover, patients with borderline epileptiform abnormalities on st-EEG or with normal st-EEG but high clinical suspicion for TEA underwent a 16-channel 24-hour ambulatory EEG (24-h EEG). Clinical features, neurophysiological, and neuroimaging data were analyzed and compared in the two groups (TEA and TGA). RESULTS Diagnosis of TEA, according to Zeman's criteria, was made in 15 patients (18%). From a clinical point of view recurrence (p < .001) and atypical symptoms such as confusion or language disorder (TGA plus manifestations), appear to be key elements in order to discriminate between TEA and TGA (80% of patients with TEA vs 7.8% of patients with TGA; p < .001). In our sample, duration of the episodes did not significantly differ between TGA and TEA, even though it is usually described as shorter for TEA. This result could be related with a prolonged postictal state in these patients. The analysis of st-EEG results evidenced low sensitivity for interictal epileptiform abnormalities (IEAs) detection (52.3%), with not conclusive data in distinguishing TEA from TGA. On the contrary, 24-h EEG showed IEAs in all patients with epilepsy, mostly during sleep, suggesting an essential diagnostic role of long-lasting EEG recording for TEA. Finally, structural abnormalities were more frequent in patients with TEA (26.6%). In the group with TGA, the only imaging alteration found was diffusion weighted imaging (DWI) hippocampal hyperintensity. CONCLUSION Our findings show that in a real-life clinical scenario, TEA is frequent but often overlooked. However, simple clinical data and widely available neurophysiological examinations can truly help to effectively distinguish TEA from TGA.
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Affiliation(s)
- Jacopo Lanzone
- Unit of Neurology, Neurophysiology, Neurobiology, Department of Medicine, University Campus Bio-Medico of Rome, via Álvaro del Portillo, 21, 00128 Rome, Italy
| | - Lorenzo Ricci
- Unit of Neurology, Neurophysiology, Neurobiology, Department of Medicine, University Campus Bio-Medico of Rome, via Álvaro del Portillo, 21, 00128 Rome, Italy.
| | - Giovanni Assenza
- Unit of Neurology, Neurophysiology, Neurobiology, Department of Medicine, University Campus Bio-Medico of Rome, via Álvaro del Portillo, 21, 00128 Rome, Italy
| | - Martina Ulivi
- Unit of Neurology, Neurophysiology, Neurobiology, Department of Medicine, University Campus Bio-Medico of Rome, via Álvaro del Portillo, 21, 00128 Rome, Italy
| | - Vincenzo Di Lazzaro
- Unit of Neurology, Neurophysiology, Neurobiology, Department of Medicine, University Campus Bio-Medico of Rome, via Álvaro del Portillo, 21, 00128 Rome, Italy
| | - Mario Tombini
- Unit of Neurology, Neurophysiology, Neurobiology, Department of Medicine, University Campus Bio-Medico of Rome, via Álvaro del Portillo, 21, 00128 Rome, Italy.
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27
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Atherton KE, Filippini N, Zeman AZJ, Nobre AC, Butler CR. Encoding-related brain activity and accelerated forgetting in transient epileptic amnesia. Cortex 2018; 110:127-140. [PMID: 29861041 PMCID: PMC6335262 DOI: 10.1016/j.cortex.2018.04.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Revised: 04/06/2018] [Accepted: 04/30/2018] [Indexed: 12/25/2022]
Abstract
The accelerated forgetting of newly learned information is common amongst patients with epilepsy and, in particular, in the syndrome of transient epileptic amnesia (TEA). However, the neural mechanisms underlying accelerated forgetting are poorly understood. It has been hypothesised that interictal epileptiform activity during longer retention intervals disrupts normally established memory traces. Here, we tested a distinct hypothesis-that accelerated forgetting relates to the abnormal encoding of memories. We studied a group of 15 patients with TEA together with matched, healthy control subjects. Despite normal performance on standard anterograde memory tasks, patients showed accelerated forgetting of a word list over one week. We used a subsequent memory paradigm to compare encoding-related brain activity in patients and controls. Participants studied a series of visually presented scenes whilst undergoing functional MRI scanning. Recognition memory for these scenes was then probed outside the scanner after delays of 45 min and of 4 days. Patients showed poorer memory for the scenes compared with controls. In the patients but not the controls, subsequently forgotten stimuli were associated with reduced hippocampal activation at encoding. Furthermore, patients demonstrated reduced deactivation of posteromedial cortex regions upon viewing subsequently remembered stimuli as compared to subsequently forgotten ones. These data suggest that abnormal encoding-related activity in key memory areas of the brain contributes to accelerated forgetting in TEA. We propose that abnormally encoded memory traces may be particularly vulnerable to interference from subsequently encountered material and hence be forgotten more rapidly. Our results shed light on the mechanisms underlying memory impairment in epilepsy, and offer support to the proposal that accelerated forgetting may be a useful marker of subtle dysfunction in memory-related brain systems.
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Affiliation(s)
- Kathryn E Atherton
- Nuffield Department of Clinical Neurosciences, University of Oxford, John Radcliffe Hospital, Oxford, UK; Department of Experimental Psychology and Oxford Centre for Human Brain Activity, Wellcome Centre for Integrative Neuroimaging, Department of Psychiatry, University of Oxford, Oxford, UK
| | - Nicola Filippini
- Nuffield Department of Clinical Neurosciences, University of Oxford, John Radcliffe Hospital, Oxford, UK
| | - Adam Z J Zeman
- Cognitive & Behavioural Neurology, University of Exeter Medical School, Exeter, UK
| | - Anna C Nobre
- Department of Experimental Psychology and Oxford Centre for Human Brain Activity, Wellcome Centre for Integrative Neuroimaging, Department of Psychiatry, University of Oxford, Oxford, UK
| | - Christopher R Butler
- Nuffield Department of Clinical Neurosciences, University of Oxford, John Radcliffe Hospital, Oxford, UK.
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28
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Zeman A, Byruck M, Tallis P, Vossel K, Tranel D. Touching the void – First and third person perspectives in two cases of autobiographical amnesia linked to temporal lobe epilepsy. Neuropsychologia 2018; 110:55-64. [DOI: 10.1016/j.neuropsychologia.2017.07.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2017] [Revised: 06/07/2017] [Accepted: 07/09/2017] [Indexed: 10/19/2022]
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The evolution of accelerated long-term forgetting: Evidence from the TIME study. Cortex 2017; 110:16-36. [PMID: 29122206 PMCID: PMC6330058 DOI: 10.1016/j.cortex.2017.09.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 08/10/2017] [Accepted: 09/09/2017] [Indexed: 01/12/2023]
Abstract
OBJECTIVE Accelerated long-term forgetting (ALF) occurs when newly learned information decays faster than normal over extended delays. It has been recognised most frequently in temporal lobe epilepsy, including Transient Epileptic Amnesia (TEA), but can also be drug-induced. Little is known about the evolution of ALF over time and its impacts upon other memory functions, such as autobiographical memory (ABM). Here we investigate the long-term outcome of ALF and ABM in a group of patients with TEA and a single case of baclofen-induced ALF. METHODS Study 1 involved a longitudinal follow-up of 14 patients with TEA over a 10-year period. Patients repeated a neuropsychological battery, three ALF measures (with free recall probed at 30-min and 1-week), and a modified Autobiographical Memory Interview (MAMI). Performance was compared with a group of healthy age-matched controls. In Study 2, patient CS, who previously experienced baclofen-induced ALF, was followed over 4 years, and re-tested now, 18 months after ceasing baclofen. CS repeated a neuropsychological battery, three ALF experimental tasks (each probed after 30 min and 1 week), and a modified autobiographical interview (AI). Her performance was compared with healthy age-matched controls. RESULTS On ALF measures, the TEA group performed significantly below controls, but when analysed individually, 4 of the 7 patients who originally showed ALF no longer did so. In two, this was accompanied by improvements in ABM for recent but not remote memory. Patient CS no longer demonstrated ALF on standard lab-based tests and now appeared to retain new episodic autobiographical events with a similar degree of episodic richness as controls. CONCLUSION Long-term follow up suggests that ALF can resolve, with improvements translating to recent ABM in some cases.
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Lah S, Black C, Gascoigne MB, Gott C, Epps A, Parry L. Accelerated Long-Term Forgetting Is Not Epilepsy Specific: Evidence from Childhood Traumatic Brain Injury. J Neurotrauma 2017; 34:2536-2544. [DOI: 10.1089/neu.2016.4872] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Affiliation(s)
- Suncica Lah
- School of Psychology, The University of Sydney, Sydney, New South Wales, Australia
- ARC Centre of Excellence in Cognition and its Disorders, Macquarie University, Sydney, New South Wales, Australia
| | - Carly Black
- School of Psychology, The University of Sydney, Sydney, New South Wales, Australia
| | - Michael B. Gascoigne
- School of Psychology, The University of Sydney, Sydney, New South Wales, Australia
- ARC Centre of Excellence in Cognition and its Disorders, Macquarie University, Sydney, New South Wales, Australia
| | - Chloe Gott
- School of Psychology, The University of Sydney, Sydney, New South Wales, Australia
| | - Adrienne Epps
- Brain Injury Rehabilitation Program, Rehab2Kids, Sydney Children's Hospital, Randwick, New South Wales, Australia
| | - Louise Parry
- Brain Injury Rehabilitation Program, Rehab2Kids, Sydney Children's Hospital, Randwick, New South Wales, Australia
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Lemesle B, Planton M, Pagès B, Pariente J. Accelerated long-term forgetting and autobiographical memory disorders in temporal lobe epilepsy: One entity or two? Rev Neurol (Paris) 2017; 173:498-505. [PMID: 28843413 DOI: 10.1016/j.neurol.2017.07.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Revised: 06/28/2017] [Accepted: 07/04/2017] [Indexed: 11/16/2022]
Abstract
Temporal lobe epilepsy (TLE) is a type of epilepsy that often has a negative impact on patients' memory. Despite the importance of patients' complaints in this regard, the difficulties described by these patients are often not easy to demonstrate through a standard neuropsychological assessment. Accelerated long-term forgetting and autobiographical memory disorders are the two main memory impairments reported in the literature in patients with TLE. However, the methods used by different authors to evaluate long-term memory and autobiographical memory are heterogeneous. This heterogeneity can lead to differences in the observed results as well as how they are interpreted. Yet, despite the methodological differences, objectification of such memory deficits appears to be both specific and robust within this patient population. Analysis of the literature shows that accelerated long-term forgetting and autobiographical memory disorders share the same clinical characteristics. This leads to the assumption that they are, in fact, only one entity and that their evaluation may be done through a single procedure. Our proposal is to place this evaluation within the context of memory consolidation disorders. With such a perspective, evaluation of accelerated forgetting in autobiographical memory should consist of identifying a disorder in the formation and/or recovery of new memory traces.
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Affiliation(s)
- B Lemesle
- Department of neurology, Toulouse university hospital, place du Dr-Baylac, 31059 Toulouse cedex, France; Toulouse neuroimaging center, université de Toulouse, Inserm, UPS, place du Dr-Baylac, 31059 Toulouse cedex, France.
| | - M Planton
- Department of neurology, Toulouse university hospital, place du Dr-Baylac, 31059 Toulouse cedex, France; Toulouse neuroimaging center, université de Toulouse, Inserm, UPS, place du Dr-Baylac, 31059 Toulouse cedex, France
| | - B Pagès
- Department of neurology, Toulouse university hospital, place du Dr-Baylac, 31059 Toulouse cedex, France; Toulouse neuroimaging center, université de Toulouse, Inserm, UPS, place du Dr-Baylac, 31059 Toulouse cedex, France
| | - J Pariente
- Department of neurology, Toulouse university hospital, place du Dr-Baylac, 31059 Toulouse cedex, France; Toulouse neuroimaging center, université de Toulouse, Inserm, UPS, place du Dr-Baylac, 31059 Toulouse cedex, France
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Tramoni-Negre E, Lambert I, Bartolomei F, Felician O. Long-term memory deficits in temporal lobe epilepsy. Rev Neurol (Paris) 2017; 173:490-497. [DOI: 10.1016/j.neurol.2017.06.011] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2017] [Accepted: 06/15/2017] [Indexed: 11/25/2022]
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Miller LA, Mothakunnel A, Flanagan E, Nikpour A, Thayer Z. Accelerated Long Term Forgetting in patients with focal seizures: Incidence rate and contributing factors. Epilepsy Behav 2017; 72:108-113. [PMID: 28575758 DOI: 10.1016/j.yebeh.2017.04.039] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Revised: 03/21/2017] [Accepted: 04/22/2017] [Indexed: 11/16/2022]
Abstract
BACKGROUND Accelerated Long Term Forgetting (ALF) is usually defined as a memory impairment that is seen only at long delays (e.g., after days or weeks) and not at shorter delays (e.g., 30min) typically used in clinical settings. Research indicates that ALF occurs in some patients with epilepsy, but the incidence rates and underlying causes have not been established. In this study, we considered these issues. METHODS Forty-four patients with a history of focal seizures were tested at 30min and 7day delays for material from the Rey Auditory Verbal Learning Test (RAVLT) and Aggie Figures Test. Recently published norms from a matched group of 60 control subjects (Miller et al., 2015 ) were used to determine whether patients demonstrated ALF, impairment at 30min or intact memory performance. RESULTS The incidence of ALF in the epilepsy patients (18%) was >3 times higher than normal on the RAVLT, but no different (7%) from the incidence in normal subjects on the Aggie Figures. A different, but again significantly high, proportion of patients (36%) showed shorter-term memory deficits on at least one task. ALF was found mainly in patients with temporal-lobe epilepsy, but also occurred in one patient with an extratemporal seizure focus. Presence of a hippocampal lesion was the main predicting factor of ALF. CONCLUSIONS Many patients with a focal seizure disorder show memory deficits after longer delays that are not evident on standard assessment. The present study explored the factors associated with this ALF memory profile. These new findings will enhance clinical practice, particularly the management of patients with memory complaints.
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Affiliation(s)
- Laurie A Miller
- Institute of Clinical Neurosciences, Royal Prince Alfred Hospital, and Central Medical School, University of Sydney, Camperdown, NSW, Australia; ARC-Centre of Excellence in Cognition and Its Disorders, University of Sydney, NSW, Australia.
| | - Annu Mothakunnel
- ARC-Centre of Excellence in Cognition and Its Disorders, University of Sydney, NSW, Australia; Neuroscience Research Australia, Sydney, NSW, Australia
| | - Emma Flanagan
- Neuroscience Research Australia, Sydney, NSW, Australia; Norwich Medical School, University of East Anglia, Norwich, United Kingdom
| | - Armin Nikpour
- Institute of Clinical Neurosciences, Royal Prince Alfred Hospital, and Central Medical School, University of Sydney, Camperdown, NSW, Australia; ARC-Centre of Excellence in Cognition and Its Disorders, University of Sydney, NSW, Australia
| | - Zoe Thayer
- Institute of Clinical Neurosciences, Royal Prince Alfred Hospital, and Central Medical School, University of Sydney, Camperdown, NSW, Australia; ARC-Centre of Excellence in Cognition and Its Disorders, University of Sydney, NSW, Australia
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Vossel KA, Tartaglia MC, Nygaard HB, Zeman AZ, Miller BL. Epileptic activity in Alzheimer's disease: causes and clinical relevance. Lancet Neurol 2017; 16:311-322. [PMID: 28327340 DOI: 10.1016/s1474-4422(17)30044-3] [Citation(s) in RCA: 345] [Impact Index Per Article: 49.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Revised: 01/10/2017] [Accepted: 01/31/2017] [Indexed: 01/18/2023]
Abstract
Epileptic activity is frequently associated with Alzheimer's disease; this association has therapeutic implications, because epileptic activity can occur at early disease stages and might contribute to pathogenesis. In clinical practice, seizures in patients with Alzheimer's disease can easily go unrecognised because they usually present as non-motor seizures, and can overlap with other symptoms of the disease. In patients with Alzheimer's disease, seizures can hasten cognitive decline, highlighting the clinical relevance of early recognition and treatment. Some evidence indicates that subclinical epileptiform activity in patients with Alzheimer's disease, detected by extended neurophysiological monitoring, can also lead to accelerated cognitive decline. Treatment of clinical seizures in patients with Alzheimer's disease with select antiepileptic drugs (AEDs), in low doses, is usually well tolerated and efficacious. Moreover, studies in mouse models of Alzheimer's disease suggest that certain classes of AEDs that reduce network hyperexcitability have disease-modifying properties. These AEDs target mechanisms of epileptogenesis involving amyloid β and tau. Clinical trials targeting network hyperexcitability in patients with Alzheimer's disease will identify whether AEDs or related strategies could improve their cognitive symptoms or slow decline.
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Affiliation(s)
- Keith A Vossel
- Memory and Aging Center, Department of Neurology, University of California, San Francisco, CA, USA.
| | | | - Haakon B Nygaard
- Division of Neurology, University of British Columbia, Vancouver, BC, Canada
| | - Adam Z Zeman
- Cognitive Neurology Research Group, University of Exeter Medical School, Exeter, UK
| | - Bruce L Miller
- Memory and Aging Center, Department of Neurology, University of California, San Francisco, CA, USA
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Allé MC, Manning L, Potheegadoo J, Coutelle R, Danion JM, Berna F. Wearable Cameras Are Useful Tools to Investigate and Remediate Autobiographical Memory Impairment: A Systematic PRISMA Review. Neuropsychol Rev 2017; 27:81-99. [DOI: 10.1007/s11065-016-9337-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 11/29/2016] [Indexed: 10/20/2022]
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Savage SA, Butler CR, Milton F, Han Y, Zeman AZ. On the nose: Olfactory disturbances in patients with transient epileptic amnesia. Epilepsy Behav 2017; 66:113-119. [PMID: 28038387 PMCID: PMC6197428 DOI: 10.1016/j.yebeh.2016.09.043] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Revised: 09/29/2016] [Accepted: 09/30/2016] [Indexed: 11/17/2022]
Abstract
OBJECTIVE While olfactory hallucinations are relatively rare in epilepsy, a high prevalence (up to 42%) has been reported in one form - Transient Epileptic Amnesia (TEA). TEA is characterized by recurring amnestic seizures and is commonly associated with persistent interictal memory deficits. Despite reports of changes in smell, olfactory ability has not been objectively assessed in this group. The aim of this study was to measure olfactory ability in patients with TEA and explore whether olfactory symptoms relate to other clinical variables. METHODS Fifty-five participants with TEA were recruited from The Impairment of Memory in Epilepsy project database. The presence of olfactory symptoms was obtained via case notes and clinical interview. Participants completed questionnaires to evaluate their olfaction and memory function subjectively. Olfactory ability was measured using the University of Pennsylvania Smell Identification Test (UPSIT). TEA participants' performance was compared to 50 matched healthy control participants. A subset of TEA participants (n=26) also completed a battery of memory tests including standard neuropsychological measures, and assessment of accelerated long-term forgetting and autobiographical memory. RESULTS Olfactory hallucinations were reported in 55% of patients with TEA. A significant reduction in smell identification (UPSIT) was found between patients with TEA and healthy controls (p<0.001). Epilepsy variables, including history of olfactory hallucinations, were not predictive of olfactory ability. Patients reported ongoing memory difficulties and performed below normative values on objective tests. While no correlation was found between objective measures of memory and olfactory performance, subjective complaints of route finding difficulty was associated with UPSIT score. CONCLUSIONS Impairments in odor identification are common in patients with TEA and exceed changes that occur in normal aging. Olfactory hallucinations occurs in approximately half of patients with TEA, but do not always coincide with reduced sense of smell. Olfactory impairment and interictal memory problems both occur frequently in TEA but are not closely associated.
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Affiliation(s)
- Sharon A. Savage
- Cognitive & Behavioural Neurology, University of Exeter Medical School, College House, St Luke’s Campus, Exeter, EX1 2LU, UK,corresponding author:
| | - Christopher R. Butler
- Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, John Radcliffe Hospital, OX3 9DU, UK
| | - Fraser Milton
- Discipline of Psychology, University of Exeter, Washington Singer Laboratories, Exeter, EX4 4QG, UK
| | - Yang Han
- Health Statistics, University of Exeter Medical School, South Cloisters, St Luke’s Campus, Exeter, EX1 2LU, UK
| | - Adam Z. Zeman
- Cognitive & Behavioural Neurology, University of Exeter Medical School, College House, St Luke’s Campus, Exeter, EX1 2LU, UK
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Dubourg L, Silva A, Fitamen C, Moulin C, Souchay C. SenseCam: A new tool for memory rehabilitation? Rev Neurol (Paris) 2016; 172:735-747. [DOI: 10.1016/j.neurol.2016.03.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 02/09/2016] [Accepted: 03/17/2016] [Indexed: 11/30/2022]
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Savage SA, Butler CR, Hodges JR, Zeman AZ. Transient Epileptic Amnesia over twenty years: Long-term follow-up of a case series with three detailed reports. Seizure 2016; 43:48-55. [PMID: 27886629 PMCID: PMC6161809 DOI: 10.1016/j.seizure.2016.10.022] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Accepted: 10/30/2016] [Indexed: 12/04/2022] Open
Abstract
Purpose Transient Epileptic Amnesia (TEA) is a form of adult onset temporal lobe epilepsy characterised by ictal amnesia. The amnesic seizures are often accompanied by interical memory disturbance, involving autobiographical amnesia and accelerated long-term forgetting. Short-term follow-up studies suggest a relatively stable cognitive profile once treated, but recent case reports raise concerns regarding the risk of developing Alzheimer’s Disease (AD). The current study reports clinical and cognitive outcome in TEA patients over a 20-year period. Methods A cohort of ten TEA patients first reported in 1998 were followed up at two time intervals, each 10 years apart. Information regarding clinical outcomes and subjective reports of memory functioning was gained via GP records and clinical interview. Objective memory function was determined at each time point via a comprehensive neuropsychological assessment, where possible. Results Information was obtained for nine of the original 10 participants. Over the 20-year period, 4 participants died, with no indication of dementia prior to death. One participant was diagnosed with Vascular Dementia. Seizures were generally well controlled. Subjective reports of memory varied, including no concerns, stable memory difficulties, and worsening memory. Neuropsychological assessment at 10 years showed stable performances across most measures. At the 20-year follow up, there was no evidence of a general cognitive decline. Participants showed stability on some measures, with reductions on others. Performance was not consistent with AD. Conclusions No elevated risk of dementia was evident from this TEA series. Although memory difficulties persist over time, the prognosis of TEA appears generally benign.
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Affiliation(s)
- Sharon A Savage
- Cognitive & Behavioural Neurology, University of Exeter Medical School, College House, St. Luke's Campus, Exeter EX1 2LU, UK.
| | - Christopher R Butler
- Nuffield Department of Clinical Neurosciences, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DU, UK
| | - John R Hodges
- Faculty of Medicine, School of Medical Sciences, University of New South Wales, Sydney, Australia; Neuroscience Research Australia, PO Box 1165, Randwick, NSW 2031, Australia
| | - Adam Z Zeman
- Cognitive & Behavioural Neurology, University of Exeter Medical School, College House, St. Luke's Campus, Exeter EX1 2LU, UK
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Forgetting in temporal lobe epilepsy: When does it become accelerated? Cortex 2016; 78:70-84. [DOI: 10.1016/j.cortex.2016.02.005] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Revised: 01/05/2016] [Accepted: 02/08/2016] [Indexed: 11/18/2022]
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Burgess GH, Chadalavada B. Profound anterograde amnesia following routine anesthetic and dental procedure: a new classification of amnesia characterized by intermediate-to-late-stage consolidation failure? Neurocase 2016; 22:84-94. [PMID: 25978125 DOI: 10.1080/13554794.2015.1046885] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Anterograde amnesia caused by bilateral hippocampal or diencephalon damage manifests in characteristic symptoms of preserved intellect and implicit learning, and short span of awareness with complete and rapid forgetting of episodic material. A new case, WO, 38-year-old male with anterograde amnesia, in the absence of structural brain changes or psychological explanation is presented, along with four comparison cases from the extant literature that share commonalities between them including preserved intellect, span of awareness greater than working memory, and complete forgetting within hours or days following successful learning, including notably for both explicit and implicit material. WO's amnesia onset coincided with anesthetic injection and root canal procedure, with extended vasovagal-like incident. The commonalities between the five cases presented may suggest a shared biological mechanism involving the breakdown of intermediate-to-late-stage consolidation that does not depend on the structural integrity of the hippocampi. Speculation on the mechanism of consolidation breakdown and diagnostic implications are discussed.
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Affiliation(s)
- Gerald H Burgess
- a Department of Clinical Psychology , University of Leicester , Leicester , UK
| | - Bhanu Chadalavada
- b Consultant Psychiatrist , Northamptonshire Healthcare Foundation NHS Trust , Northampton , UK
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Ladowsky-Brooks RL. Four-hour delayed memory recall for stories: Theoretical and clinical implications of measuring accelerated long-term forgetting. APPLIED NEUROPSYCHOLOGY-ADULT 2015; 23:205-12. [PMID: 26502999 DOI: 10.1080/23279095.2015.1030670] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
It has been noted that clinical neuropsychological assessment is "blind" to certain abnormalities of consolidation that occur beyond standard 30-min delay intervals. For example, normal forgetting at 30-min delays has been followed by enhanced forgetting at longer delays in temporal-lobe epilepsy, termed accelerated long-term forgetting (ALF). To evaluate whether ALF could be identified in the neuropsychological assessment of a small sample of examinees with head injuries or other neurological diagnoses (n = 42), a 4-hr delayed recall condition was added to the Logical Memory subtest of the Wechsler Memory Scale-Third Edition. A small percentage of examinees (5/42 or 11%), despite exhibiting unimpaired story recall immediately and after 30-min delays, showed increased forgetting when compared with the average retention of stories (M = 0.83, SD = 0.17) after a 4-hr delay. Three of these 5 examinees also had impaired scores on 20-min delayed recall of the California Verbal Learning Test-Second Edition (CVLT-II) and would have been identified as having memory impairment without an extended, 4-hr delayed recall. In fact, the highest correlation among memory indexes was between 4-hr delayed recall of stories and delayed recall of the CVLT-II word list (r = .59, p < .0001), suggesting different consolidation rates for relational and nonrelational material.
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Ricci M, Mohamed A, Savage G, Miller LA. Disruption of learning and long-term retention of prose passages in patients with focal epilepsy. Epilepsy Behav 2015; 51:104-11. [PMID: 26262938 DOI: 10.1016/j.yebeh.2015.06.016] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2014] [Revised: 05/28/2015] [Accepted: 06/08/2015] [Indexed: 11/29/2022]
Abstract
Recent investigations of accelerated long-term forgetting, a condition in which newly acquired memory is normal initially but decays rapidly over days or weeks, indicate that multiple factors might influence whether this phenomenon is seen in patients with epilepsy. Test-based differences such as learning condition or type of memory measure (e.g., recall vs recognition) as well as epilepsy variables (e.g., side, site, or frequency of epileptiform activity) may be important. The present study sought to characterize factors affecting learning and memory for prose passages in patients with focal epilepsy. We enrolled 21 patients with temporal lobe epilepsy, with and without hippocampal lesions, 11 patients with extratemporal epilepsy (ETE), and 29 healthy controls. Two matched passages were used to compare effects of initial learning condition (one exposure versus learning-to-criterion) on subsequent patterns of retention. Recall and recognition were tested at different delays (i.e., immediately, 30min, 24h, and 4days). Regression analyses and one-way ANOVAs indicated that having a left-hemisphere epileptic focus had a negative impact on learning, whilst presence of a hippocampal lesion (irrespective of side) was associated with deterioration in recall for intervals up to 24h postencoding. Learning condition affected patterns of memory decay in that the ETE group showed significant decline in recall between 24h and 4days only when stories were learned to criterion. In contrast with recall, no changes over time were evident in recognition memory, as patients with hippocampal lesions were impaired from 30min onward. Epilepsy variables other than side and site of epilepsy/lesion did not influence performance. In conclusion, the left hemisphere is involved in learning of prose material, and the hippocampus is involved in the consolidation of this material mainly for the first 24h. After this, cortical regions outside the hippocampus become important for recall.
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Affiliation(s)
- Monica Ricci
- ARC Centre of Excellence in Cognition and its Disorders, Macquarie University, Sydney, Australia
| | - Armin Mohamed
- Institute of Clinical Neurosciences, Royal Prince Alfred Hospital, Sydney, Australia
| | - Greg Savage
- ARC Centre of Excellence in Cognition and its Disorders, Macquarie University, Sydney, Australia
| | - Laurie A Miller
- Institute of Clinical Neurosciences, Royal Prince Alfred Hospital, Sydney, Australia; ARC Centre of Excellence in Cognition and its Disorders, University of Sydney, Sydney, Australia.
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Korczyn AD, Schachter SC, Amlerova J, Bialer M, van Emde Boas W, Brázdil M, Brodtkorb E, Engel J, Gotman J, Komárek V, Leppik IE, Marusic P, Meletti S, Metternich B, Moulin CJA, Muhlert N, Mula M, Nakken KO, Picard F, Schulze-Bonhage A, Theodore W, Wolf P, Zeman A, Rektor I. Third International Congress on Epilepsy, Brain and Mind: Part 1. Epilepsy Behav 2015; 50:116-37. [PMID: 26276417 PMCID: PMC5256665 DOI: 10.1016/j.yebeh.2015.06.044] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Accepted: 06/24/2015] [Indexed: 12/12/2022]
Abstract
Epilepsy is both a disease of the brain and the mind. Here, we present the first of two papers with extended summaries of selected presentations of the Third International Congress on Epilepsy, Brain and Mind (April 3-5, 2014; Brno, Czech Republic). Epilepsy in history and the arts and its relationships with religion were discussed, as were overviews of epilepsy and relevant aspects of social cognition, handedness, accelerated forgetting and autobiographical amnesia, and large-scale brain networks.
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Affiliation(s)
- Amos D Korczyn
- Sackler School of Medicine, Tel Aviv University, Ramat Aviv, Israel
| | - Steven C Schachter
- Consortia for Improving Medicine with Innovation and Technology, Harvard Medical School, Boston, MA, USA.
| | - Jana Amlerova
- Department of Neurology, Charles University, 2nd Faculty of Medicine, Motol University Hospital, Prague, Czech Republic
| | - Meir Bialer
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Walter van Emde Boas
- Department of EEG, Dutch Epilepsy Clinics Foundation (SEIN), Heemstede, The Netherlands; Epilepsy Monitoring Unit, Dutch Epilepsy Clinics Foundation (SEIN), Heemstede, The Netherlands
| | - Milan Brázdil
- Masaryk University, Brno Epilepsy Center, St. Anne's Hospital and School of Medicine, Brno, Czech Republic; Central European Institute of Technology (CEITEC), Brno, Czech Republic
| | - Eylert Brodtkorb
- Department of Neurology and Clinical Neurophysiology, St. Olav's Hospital, Trondheim University Hospital, Trondheim, Norway; Department of Neuroscience, Norwegian University of Science and Technology, Trondheim, Norway
| | | | - Jean Gotman
- Montreal Neurological Institute, McGill University, Montreal, Canada
| | - Vladmir Komárek
- Department of Paediatric Neurology, Charles University, 2nd Faculty of Medicine, Motol University Hospital, Prague, Czech Republic
| | - Ilo E Leppik
- MINCEP Epilepsy Care, University of Minnesota, Minneapolis, MN, USA; College of Pharmacy, University of Minnesota, Minneapolis, MN, USA
| | - Petr Marusic
- Department of Neurology, Charles University, 2nd Faculty of Medicine, Motol University Hospital, Prague, Czech Republic
| | - Stefano Meletti
- Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | | | - Chris J A Moulin
- Laboratory for the Study of Learning and Development, University of Bourgogne, Dijon, France
| | - Nils Muhlert
- School of Psychology and Cardiff University Brain Research Imaging Centre, Cardiff University, Cardiff, Wales, UK
| | - Marco Mula
- Epilepsy Group, Atkinson Morley Regional Neuroscience Centre, St. George's Hospital, London, UK; Institute of Medical and Biomedical Sciences, St. George's University of London, London, UK
| | - Karl O Nakken
- National Centre for Epilepsy, Oslo University Hospital, Norway
| | - Fabienne Picard
- Department of Neurology, University Hospital and Medical School of Geneva, Switzerland
| | | | - William Theodore
- Clinical Epilepsy Section, National Institute of Neurological Disorders and Stroke, Bethesda, MD, USA
| | - Peter Wolf
- Danish Epilepsy Centre Filadelfia, Dianalund, Denmark; Department of Clinical Medicine, Neurological Service, Federal University of Santa Catarina, Florianópolis, SC, Brazil
| | - Adam Zeman
- University of Exeter Medical School, St. Luke's Campus, Exeter, UK
| | - Ivan Rektor
- Masaryk University, Brno Epilepsy Center, St. Anne's Hospital and School of Medicine, Brno, Czech Republic; Central European Institute of Technology (CEITEC), Brno, Czech Republic
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Miller LA, Flanagan E, Mothakunnel A, Mohamed A, Thayer Z. Old dogs with new tricks: Detecting accelerated long-term forgetting by extending traditional measures. Epilepsy Behav 2015; 45:205-11. [PMID: 25825369 DOI: 10.1016/j.yebeh.2015.01.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Revised: 01/19/2015] [Accepted: 01/21/2015] [Indexed: 11/30/2022]
Abstract
Accelerated long-term forgetting (ALF) is a condition in which normal memory performance is displayed after short delays, but significant memory loss is detected when memory is tested after several days or weeks. This condition has been reported in patients with epilepsy, but there are few normative scores available for its detection in clinical practice. In the present study, we assessed 60 healthy control subjects 18-60years of age on three memory measures [Rey Auditory Verbal Learning (RAVLT), Logical Memory (LM), and Aggie Figures] at delays of 30min and 7days. With these normative values, we determined cutoff scores to look for ALF and then categorized the performance of 15 patients with focal epilepsy on the same tasks. Seven of the patients showed ALF, and, in four of these, no other memory deficits (i.e., deficits at 30min on at least one task) were detected. Of the several demographic and epilepsy factors examined, only higher estimated IQ and older age predicted ALF (and only on one task: RAVLT). The findings provide a useful set of data to be applied in the clinic and some insight into the factors that influence retention within the first week.
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Affiliation(s)
- Laurie A Miller
- Institute of Clinical Neurosciences, Royal Prince Alfred Hospital, Camperdown, NSW, Australia; ARC-Centre of Excellence in Cognition and Its Disorders, University of Sydney, NSW, Australia.
| | - Emma Flanagan
- Neuroscience Research Australia, Sydney, NSW, Australia
| | - Annu Mothakunnel
- ARC-Centre of Excellence in Cognition and Its Disorders, Macquarie University, NSW, Australia
| | - Armin Mohamed
- Institute of Clinical Neurosciences, Royal Prince Alfred Hospital, Camperdown, NSW, Australia
| | - Zoe Thayer
- Institute of Clinical Neurosciences, Royal Prince Alfred Hospital, Camperdown, NSW, Australia; ARC-Centre of Excellence in Cognition and Its Disorders, University of Sydney, NSW, Australia
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Felician O, Tramoni E, Bartolomei F. Transient epileptic amnesia: Update on a slowly emerging epileptic syndrome. Rev Neurol (Paris) 2015; 171:289-97. [DOI: 10.1016/j.neurol.2014.11.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Accepted: 11/11/2014] [Indexed: 11/30/2022]
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Huijgen J, Samson S. The hippocampus: A central node in a large-scale brain network for memory. Rev Neurol (Paris) 2015; 171:204-16. [DOI: 10.1016/j.neurol.2015.01.557] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 01/22/2015] [Accepted: 01/29/2015] [Indexed: 11/25/2022]
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Dewar M, Hoefeijzers S, Zeman A, Butler C, Della Sala S. Impaired picture recognition in transient epileptic amnesia. Epilepsy Behav 2015; 42:107-16. [PMID: 25506793 DOI: 10.1016/j.yebeh.2014.10.032] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Revised: 10/06/2014] [Accepted: 10/28/2014] [Indexed: 11/29/2022]
Abstract
Transient epileptic amnesia (TEA) is an epileptic syndrome characterized by recurrent, brief episodes of amnesia. Transient epileptic amnesia is often associated with the rapid decline in recall of new information over hours to days (accelerated long-term forgetting - 'ALF'). It remains unknown how recognition memory is affected in TEA over time. Here, we report a systematic study of picture recognition in patients with TEA over the course of one week. Sixteen patients with TEA and 16 matched controls were presented with 300 photos of everyday life scenes. Yes/no picture recognition was tested 5min, 2.5h, 7.5h, 24h, and 1week after picture presentation using a subset of target pictures as well as similar and different foils. Picture recognition was impaired in the patient group at all test times, including the 5-minute test, but it declined normally over the course of 1week. This impairment was associated predominantly with an increased false alarm rate, especially for similar foils. High performance on a control test indicates that this impairment was not associated with perceptual or discrimination deficits. Our findings suggest that, at least in some TEA patients with ALF in verbal recall, picture recognition does not decline more rapidly than in controls over 1week. However, our findings of an early picture recognition deficit suggest that new visual memories are impoverished after minutes in TEA. This could be the result of deficient encoding or impaired early consolidation. The early picture recognition deficit observed could reflect either the early stages of the process that leads to ALF or a separable deficit of anterograde memory in TEA. Lastly, our study suggests that at least some patients with TEA are prone to falsely recognizing new everyday visual information that they have not in fact seen previously. This deficit, alongside their ALF in free recall, likely affects everyday memory performance.
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Affiliation(s)
- Michaela Dewar
- Human Cognitive Neuroscience, Psychology, University of Edinburgh, Edinburgh, UK; Psychology, School of Life Sciences, Heriot-Watt University, Edinburgh, UK.
| | - Serge Hoefeijzers
- Human Cognitive Neuroscience, Psychology, University of Edinburgh, Edinburgh, UK
| | - Adam Zeman
- Cognitive and Behavioural Neurology, University of Exeter Medical School, Exeter, UK
| | - Christopher Butler
- Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK
| | - Sergio Della Sala
- Human Cognitive Neuroscience, Psychology, University of Edinburgh, Edinburgh, UK; Centre for Cognitive Ageing and Cognitive Epidemiology, Psychology, University of Edinburgh, Edinburgh, UK
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The impact of epileptiform abnormalities and hippocampal lesions on retention of recent autobiographical experiences: Adding insult to injury? Neuropsychologia 2015; 66:259-66. [DOI: 10.1016/j.neuropsychologia.2014.11.027] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2014] [Revised: 11/20/2014] [Accepted: 11/23/2014] [Indexed: 11/23/2022]
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Tu S, Miller L, Piguet O, Hornberger M. Accelerated forgetting of contextual details due to focal medio-dorsal thalamic lesion. Front Behav Neurosci 2014; 8:320. [PMID: 25309371 PMCID: PMC4163931 DOI: 10.3389/fnbeh.2014.00320] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Accepted: 08/28/2014] [Indexed: 11/13/2022] Open
Abstract
Effects of thalamic nuclei damage and related white matter tracts on memory performance are still debated. This is particularly evident for the medio-dorsal thalamus which has been less clear in predicting amnesia than anterior thalamus changes. The current study addresses this issue by assessing 7 thalamic stroke patients with consistent unilateral lesions focal to the left medio-dorsal nuclei for immediate and delayed memory performance on standard visual and verbal tests of anterograde memory, and over the long-term (>24 h) on an object-location associative memory task. Thalamic patients showed selective impairment to delayed recall, but intact recognition memory. Patients also showed accelerated forgetting of contextual details after a 24 h delay, compared to controls. Importantly, the mammillothalamic tract was intact in all patients, which suggests a role for the medio-dorsal nuclei in recall and early consolidation memory processes.
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Affiliation(s)
- Sicong Tu
- Neuroscience Research Australia, School of Medical Sciences, University of New South Wales Sydney, NSW, Australia ; Australian Research Council Centre of Excellence in Cognition and its Disorders Sydney, NSW, Australia
| | - Laurie Miller
- Australian Research Council Centre of Excellence in Cognition and its Disorders Sydney, NSW, Australia ; Central Clinical School, Neuropsychology Unit, Royal Prince Alfred Hospital, University of Sydney Sydney, NSW, Australia
| | - Olivier Piguet
- Neuroscience Research Australia, School of Medical Sciences, University of New South Wales Sydney, NSW, Australia ; Australian Research Council Centre of Excellence in Cognition and its Disorders Sydney, NSW, Australia
| | - Michael Hornberger
- Neuroscience Research Australia, School of Medical Sciences, University of New South Wales Sydney, NSW, Australia ; Australian Research Council Centre of Excellence in Cognition and its Disorders Sydney, NSW, Australia ; Department of Clinical Neurosciences, University of Cambridge Cambridge, UK
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Hoefeijzers S, Dewar M, Della Sala S, Butler C, Zeman A. Accelerated long-term forgetting can become apparent within 3-8 hours of wakefulness in patients with transient epileptic amnesia. Neuropsychology 2014; 29:117-25. [PMID: 25089646 PMCID: PMC4296931 DOI: 10.1037/neu0000114] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Objective: Accelerated long-term forgetting (ALF) is typically defined as a memory disorder in which information that is learned and retained normally over standard intervals (∼30 min) is forgotten at an abnormally rapid rate thereafter. ALF has been reported, in particular, among patients with transient epileptic amnesia (TEA). Previous work in TEA has revealed ALF 24 hr - 1 week after initial memory acquisition. It is unclear, however, if ALF observed 24 hr after acquisition reflects (a) an impairment of sleep consolidation processes taking place during the first night’s sleep, or (b) an impairment of daytime consolidation processes taking place during the day of acquisition. Here we focus on the daytime-forgetting hypothesis of ALF in TEA by tracking in detail the time course of ALF over the day of acquisition, as well as over 24 hr and 1 week. Method: Eleven TEA patients who showed ALF at 1 week and 16 matched controls learned 4 categorical word lists on the morning of the day of acquisition. We subsequently probed word-list retention 30 min, 3 hr, and 8 hr postacquisition (i.e., over the day of acquisition), as well as 24-hr and 1-week post acquisition. Results: ALF became apparent in the TEA group over the course of the day of acquisition 3–8 hr after learning. No further forgetting was observed over the first night in either group. Conclusions: The results of this study show that ALF in TEA can result from a deficit in memory consolidation occurring within hours of learning without a requirement for intervening sleep.
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Affiliation(s)
- Serge Hoefeijzers
- Human Cognitive Neuroscience, Department of Psychology, University of Edinburgh
| | - Michaela Dewar
- Human Cognitive Neuroscience, Department of Psychology, University of Edinburgh
| | - Sergio Della Sala
- Human Cognitive Neuroscience, Department of Psychology, University of Edinburgh
| | | | - Adam Zeman
- Cognitive and Behavioural Neurology, University of Exeter Medical School
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