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Addante RJ, Clise E, Waechter R, Bengson J, Drane DL, Perez-Caban J. A third kind of episodic memory: Context familiarity is a distinct process from item familiarity and recollection. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.07.15.603640. [PMID: 39071285 PMCID: PMC11275934 DOI: 10.1101/2024.07.15.603640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/30/2024]
Abstract
Episodic memory is accounted for with two processes: 'familiarity' when generally recognizing an item and 'recollection' when retrieving the full contextual details bound with the item. Paradoxically, people sometimes report contextual information as familiar but without recollecting details, which is not easily accounted for by existing theories. We tested a combination of item recognition confidence and source memory, focusing upon 'item-only hits with source unknown' ('item familiarity'), 'low-confidence hits with correct source memory' ('context familiarity'), and 'high-confidence hits with correct source memory' ('recollection'). Results across multiple within-subjects (trial-wise) and between subjects (individual variability) levels indicated these were behaviorally and physiologically distinct. Behaviorally, a crossover interaction was evident in response times, with context familiarity being slower than each condition during item recognition, but faster during source memory. Electrophysiologically, a Condition x Time x Location triple dissociation was evident in event-related potentials (ERPs), which was then independently replicated. Context familiarity exhibited an independent negative central effect from 800-1200 ms, differentiated from positive ERPs for item-familiarity (400 to 600 ms) and recollection (600 to 900 ms). These three conditions thus reflect mutually exclusive, fundamentally different processes of episodic memory. Context familiarity is a third distinct process of episodic memory.
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Affiliation(s)
- Richard J Addante
- Florida Institute of Technology, Department of Psychology, 150 W. University Dr., Melbourne, FL 32905, USA
- Florida Institute of Technology, Department of Biomechanical Engineering, Melbourne, FL 32905, USA
- Neurocog Analytics, LLC, Palm Bay, FL, 32905
| | - Evan Clise
- Florida Institute of Technology, Department of Psychology, 150 W. University Dr., Melbourne, FL 32905, USA
| | - Randall Waechter
- Windward Islands Research and Education Foundation (WINDREF), Saint George University Medical School, Grenada, West Indies
| | | | | | - Jahdiel Perez-Caban
- Florida Institute of Technology, Department of Psychology, 150 W. University Dr., Melbourne, FL 32905, USA
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2
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Schneider S, Coll SY, Schnider A, Ptak R. Electrophysiological analysis of signal detection outcomes emphasizes the role of decisional factors in recognition memory. Front Hum Neurosci 2024; 18:1358298. [PMID: 38571522 PMCID: PMC10989682 DOI: 10.3389/fnhum.2024.1358298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Accepted: 03/01/2024] [Indexed: 04/05/2024] Open
Abstract
Introduction Event-related potential (ERP) studies have identified two time windows associated with recognition memory and interpreted them as reflecting two processes: familiarity and recollection. However, using relatively simple stimuli and achieving high recognition rates, most studies focused on hits and correct rejections. This leaves out some information (misses and false alarms) that according to Signal Detection Theory (SDT) is necessary to understand signal processing. Methods We used a difficult visual recognition task with colored pictures of different categories to obtain enough of the four possible SDT outcomes and analyzed them with modern ERP methods. Results Non-parametric analysis of these outcomes identified a single time window (470 to 670 ms) which reflected activity within fronto-central and posterior-left clusters of electrodes, indicating differential processing. The posterior-left cluster significantly distinguished all STD outcomes. The fronto-central cluster only distinguished ERPs according to the subject's response: yes vs. no. Additionally, only electrophysiological activity within the posterior-left cluster correlated with the discrimination index (d'). Discussion We show that when all SDT outcomes are examined, ERPs of recognition memory reflect a single-time window that may reveal a bottom-up factor discriminating the history of items (i.e. memory strength), as well as a top-down factor indicating participants' decision.
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Affiliation(s)
- Stephan Schneider
- Laboratory of Cognitive Neurorehabilitation, Faculty of Medicine, University of Geneva, Geneva, Switzerland
- Department of Clinical Neurosciences, Division of Neurorehabilitation, University Hospitals of Geneva, Geneva, Switzerland
| | - Sélim Yahia Coll
- Laboratory of Cognitive Neurorehabilitation, Faculty of Medicine, University of Geneva, Geneva, Switzerland
- Department of Clinical Neurosciences, Division of Neurorehabilitation, University Hospitals of Geneva, Geneva, Switzerland
- Department of Clinical Neurosciences, Division of Neurosurgery, University Hospitals of Geneva, Geneva, Switzerland
| | - Armin Schnider
- Department of Clinical Neurosciences, Division of Neurorehabilitation, University Hospitals of Geneva, Geneva, Switzerland
| | - Radek Ptak
- Laboratory of Cognitive Neurorehabilitation, Faculty of Medicine, University of Geneva, Geneva, Switzerland
- Department of Clinical Neurosciences, Division of Neurorehabilitation, University Hospitals of Geneva, Geneva, Switzerland
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3
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Addante RJ, Lopez-Calderon J, Allen N, Luck C, Muller A, Sirianni L, Inman CS, Drane DL. An ERP measure of non-conscious memory reveals dissociable implicit processes in human recognition using an open-source automated analytic pipeline. Psychophysiology 2023; 60:e14334. [PMID: 37287106 PMCID: PMC10524783 DOI: 10.1111/psyp.14334] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 04/07/2023] [Accepted: 05/01/2023] [Indexed: 06/09/2023]
Abstract
Non-conscious processing of human memory has traditionally been difficult to objectively measure and thus understand. A prior study on a group of hippocampal amnesia (N = 3) patients and healthy controls (N = 6) used a novel procedure for capturing neural correlates of implicit memory using event-related potentials (ERPs): old and new items were equated for varying levels of memory awareness, with ERP differences observed from 400 to 800 ms in bilateral parietal regions that were hippocampal-dependent. The current investigation sought to address the limitations of that study by increasing the sample of healthy subjects (N = 54), applying new controls for construct validity, and developing an improved, open-source tool for automated analysis of the procedure used for equating levels of memory awareness. Results faithfully reproduced prior ERP findings of parietal effects that a series of systematic control analyses validated were not contributed to nor contaminated by explicit memory. Implicit memory effects extended from 600 to 1000 ms, localized to right parietal sites. These ERP effects were found to be behaviorally relevant and specific in predicting implicit memory response times, and were topographically dissociable from other traditional ERP measures of implicit memory (miss vs. correct rejections) that instead occurred in left parietal regions. Results suggest first that equating for reported awareness of memory strength is a valid, powerful new method for revealing neural correlates of non-conscious human memory, and second, behavioral correlations suggest that these implicit effects reflect a pure form of priming, whereas misses represent fluency leading to the subjective experience of familiarity.
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Affiliation(s)
- Richard J Addante
- School of Psychology, Florida Institute of Technology, Melbourne, Florida, USA
| | - Javier Lopez-Calderon
- Instituto de Matemáticas, Universidad de Talca, Talca, Chile
- Newencode Analytics, Talca, Chile
| | - Nathaniel Allen
- School of Psychology, Florida Institute of Technology, Melbourne, Florida, USA
| | - Carter Luck
- Department of Computer Science, Reed College, Portland, Oregon, USA
| | - Alana Muller
- Department of Psychology, University of Arizona, Tucson, Arizona, USA
| | - Lindsey Sirianni
- School of Health Sciences, University of California - San Diego Moores Cancer Center, San Diego, CA, USA
| | - Cory S Inman
- Department of Psychology, University of Utah, Salt Lake City, Utah, USA
| | - Daniel L Drane
- Departments of Neurology and Pediatrics, Emory University, Atlanta, Georgia, USA
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4
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Bencze D, Szőllősi Á, Németh K, Racsmány M. An event-related potential study of the testing effect: Electrophysiological evidence for context-dependent processes changing throughout repeated practice. Biol Psychol 2022; 171:108341. [PMID: 35460819 DOI: 10.1016/j.biopsycho.2022.108341] [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: 08/31/2021] [Revised: 04/14/2022] [Accepted: 04/18/2022] [Indexed: 11/17/2022]
Abstract
The testing effect refers to a special form of performance improvement following practice. Specifically, repeated retrieval attempts improve long-term memory. In the present study we examined the underlying mechanisms of the testing effect as a function of time by investigating the electrophysiological correlates of repeated retrieval practice. We additionally investigated the ERP waveforms of the repeated practice phase as a function of the accuracy on the final test in a "difference due to memory" (Dm) analysis. We found a parietally distributed, increased positive amplitude between 500-700 ms, and a more positive parietal wave between 700 and 1000 ms in the later relative to the early phases of retrieval practice. We found parietal Dm effects in the same two time windows in the retrieval practice condition with a more positive amplitude predicting retrieval success on the final test. We interpret the earlier waveform as a component associated with episodic recollection and the later ERP as a component related to post-retrieval evaluation processes. Our results demonstrate the important role of these retrieval-related processes in the facilitating effect of retrieval practice on later retrieval, and show that the involvement of these processes changes throughout practice.
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Affiliation(s)
- Dorottya Bencze
- Department of Cognitive Science, Budapest University of Technology and Economics, Egry József utca 1, 1111 Budapest, Hungary; Institute of Cognitive Neuroscience and Psychology, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, 1117 Budapest, Hungary.
| | - Ágnes Szőllősi
- Department of Cognitive Science, Budapest University of Technology and Economics, Egry József utca 1, 1111 Budapest, Hungary; Institute of Cognitive Neuroscience and Psychology, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, 1117 Budapest, Hungary.
| | - Kornél Németh
- Department of Cognitive Science, Budapest University of Technology and Economics, Egry József utca 1, 1111 Budapest, Hungary.
| | - Mihály Racsmány
- Department of Cognitive Science, Budapest University of Technology and Economics, Egry József utca 1, 1111 Budapest, Hungary; Institute of Cognitive Neuroscience and Psychology, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, 1117 Budapest, Hungary.
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5
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Addante RJ, Yousif M, Valencia R, Greenwood C, Marino R. BOOSTING BRAIN WAVES IMPROVES MEMORY. FRONTIERS FOR YOUNG MINDS 2021; 9:605677. [PMID: 34901038 PMCID: PMC8659405 DOI: 10.3389/frym.2021.605677] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Have you ever wanted to improve your memory? Or have you struggled to remember what you studied? Memory uses special patterns of activity in the brain. This experiment tested a new way to create brain wave patterns that help with memory. We wanted to see if we could improve memory by using lights and sounds that teach the brain waves to be in sync. People wore special goggles that made flashes of light and headphones that made beeping noises. This trained the brain through a process called entrainment. The entrainment put the brain in sync at a specific brain wave pattern called theta. People whose brains were trained to be in theta had better memory compared to people whose brains did not get trained. We learned that entrainment is a cool new way to make memory better.
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Affiliation(s)
- Richard J. Addante
- Department of Psychology, Florida Institute of Technology, Melbourne, FL, United States
| | - Mairy Yousif
- Department of Psychology, Florida Institute of Technology, Melbourne, FL, United States
| | - Rosemarie Valencia
- Department of Psychology, California State University, San Bernardino, San Bernardino, CA, United States
| | - Constance Greenwood
- Department of Psychology, California State University, San Bernardino, San Bernardino, CA, United States
| | - Raechel Marino
- Department of Psychology, California State University, San Bernardino, San Bernardino, CA, United States
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6
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Geurten M, Bastin C, Willems S. Feeling the ease: How the use of oral motor fluency changes in amnesia. J Neuropsychol 2021; 16:373-388. [PMID: 34755467 DOI: 10.1111/jnp.12266] [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: 11/26/2022]
Abstract
The present study examined the evolution observed in amnesic patients' use of motor fluency when making recognition memory decisions. In this experiment, 9 patients with amnesia and 18 matched controls were presented with two recognition memory tasks composed of 3 types of items: (1) natural words, (2) nonwords difficult to pronounce, and (3) nonwords easy to pronounce, the latter having been shown to be processed in a surprisingly fluent manner as long as participants can articulate them at a subvocal level (i.e., oral motor fluency). Our results provide evidence that the motor-movement manipulation was successful to induce a fluency effect. More specifically, data revealed that both amnesic patients and control participants showed a pattern of response consistent with the use of fluency as a cue to memory for studied items. However, only control participants relied on fluency to increase their rate of "yes" responses for unstudied items. These results suggest that patients with amnesia set a more conservative response criterion before relying on oral motor fluency, showing a pattern consistent with the idea that fluency is only used as a cue to memory when it exceeds a certain threshold. These findings are discussed in terms of adaptative metacognition strategies implemented by amnesic patients to reduce fluency-based memory errors as well as in terms of the variations that seem to occur in these strategies depending on the type of fluency that is experienced.
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Affiliation(s)
- Marie Geurten
- Cyclotron Research Centre, University of Liège, Belgium.,Psychology and Neuroscience of Cognition Unit, University of Liège, Belgium.,National Fund for Scientific Research, University of Liège, Belgium
| | - Christine Bastin
- Cyclotron Research Centre, University of Liège, Belgium.,Psychology and Neuroscience of Cognition Unit, University of Liège, Belgium.,National Fund for Scientific Research, University of Liège, Belgium
| | - Sylvie Willems
- Psychology and Neuroscience of Cognition Unit, University of Liège, Belgium
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7
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Andrew Leynes P. The effect of test query on recognition event-related potentials (ERPs). Brain Cogn 2021; 155:105814. [PMID: 34739915 DOI: 10.1016/j.bandc.2021.105814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 09/27/2021] [Accepted: 10/22/2021] [Indexed: 10/19/2022]
Abstract
The influence of question framing (i.e., [was the item] "old?" or "new?") on recognition memory and event-related potentials (ERPs) was investigated. Words were encoded using a shallow task to create a weak memory trace that was more susceptible to test question framing effects. Participants made yes/no judgments on two, counterbalanced tests. One test focused on old items ("old?"), whereas the other test focused on new items ("new?"). The behavioral evidence suggested that the weak memory traces led to more familiarity-based recognition judgments with a concentrated effect on decision criterion. There were some small ERP changes on the FN400 or LPC consistent with the criterion changes, but the test query did not directly alter these ERP components. Instead, the test query altered a late old/new ERP difference similar to the "right frontal old/new effect" reported in source monitoring ERP studies. When the query was "new?", old items elicited more positive ERPs, whereas there was no old/new difference when the query was "old?". The results suggest that the query framing induces memory biases that occur late in the stream of processing. More generally, the results indicate that decision criterion must be accounted for when interpreting physiological correlates of recognition memory.
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8
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Ozubko JD, Sirianni LA, Ahmad FN, MacLeod CM, Addante RJ. Recallable but not recognizable: The influence of semantic priming in recall paradigms. COGNITIVE, AFFECTIVE & BEHAVIORAL NEUROSCIENCE 2021; 21:119-143. [PMID: 33409957 PMCID: PMC7994187 DOI: 10.3758/s13415-020-00854-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 11/20/2020] [Indexed: 11/08/2022]
Abstract
When people can successfully recall a studied word, they should be able to recognize it as having been studied. In cued-recall paradigms, however, participants sometimes correctly recall words in the presence of strong semantic cues but then fail to recognize those words as actually having been studied. Although the conditions necessary to produce this unusual effect are known, the underlying neural correlates have not been investigated. Across five experiments, involving both behavioral and electrophysiological methods (EEG), we investigated the cognitive and neural processes that underlie recognition failures. Experiments 1 and 2 showed behaviorally that assuming that recalled items can be recognized in cued-recall paradigms is a flawed assumption, because recognition failures occur in the presence of cues, regardless of whether those failures are measured. With event-related potentials (ERPs), Experiments 3 and 4 revealed that successfully recalled words that are recognized are driven by recollection at recall and then by a combination of recollection and familiarity at ensuing recognition. In contrast, recognition failures did not show that memory signature and may instead be driven by semantic priming at recall and followed at recognition stages by negative-going ERP effects consistent with implicit processes, such as repetition fluency. These results demonstrate that recall - long-characterized as predominantly reflecting recollection-based processing in episodic memory - may at times also be served by a confluence of implicit cognitive processes.
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Affiliation(s)
| | - Lindsey Ann Sirianni
- California State University, San Bernardino, San Bernardino, CA, USA
- Behavioral Health and Performance Laboratory, Biomedical Research and Environmental Sciences Division, Human Health and Performance Directorate, KBR/NASA Johnson Space Center, Houston, TX, USA
| | | | | | - Richard J Addante
- California State University, San Bernardino, San Bernardino, CA, USA.
- Department of Psychology, Florida Institute of Technology, 150 W. University Blvd., Melbourne, FL, 32901, USA.
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9
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Mecklinger A, Bader R. From fluency to recognition decisions: A broader view of familiarity-based remembering. Neuropsychologia 2020; 146:107527. [DOI: 10.1016/j.neuropsychologia.2020.107527] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Revised: 06/05/2020] [Accepted: 06/07/2020] [Indexed: 01/30/2023]
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10
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Muller A, Sirianni LA, Addante RJ. Neural correlates of the Dunning-Kruger effect. Eur J Neurosci 2020; 53:460-484. [PMID: 32761954 DOI: 10.1111/ejn.14935] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Revised: 07/25/2020] [Accepted: 07/29/2020] [Indexed: 01/11/2023]
Abstract
The Dunning-Kruger effect (DKE) is a metacognitive phenomenon of illusory superiority in which individuals who perform poorly on a task believe they performed better than others, yet individuals who performed very well believe they under-performed compared to others. This phenomenon has yet to be directly explored in episodic memory, nor explored for physiological correlates or reaction times. We designed a novel method to elicit the DKE via a test of item recognition while electroencephalography (EEG) was recorded. Throughout the task, participants were asked to estimate the percentile in which they performed compared to others. Results revealed participants in the bottom 25th percentile over-estimated their percentile, while participants in the top 75th percentile under-estimated their percentile, exhibiting the classic DKE. Reaction time measures revealed a condition-by-group interaction whereby over-estimators responded faster than under-estimators when estimating being in the top percentile and responded slower when estimating being in the bottom percentile. Between-group EEG differences were evident between over-estimators and under-estimators during Dunning-Kruger responses, which revealed FN400-like effects of familiarity supporting differences for over-estimators, whereas "old-new" memory event-related potential effects revealed a late parietal component associated with recollection-based processing for under-estimators that was not evident for over-estimators. Findings suggest over- and under-estimators use differing cognitive processes when assessing their performance, such that under-estimators may rely on recollection during memory while over-estimators may draw upon excess familiarity when over-estimating their performance. Episodic memory thus appears to play a contributory role in metacognitive judgements of illusory superiority.
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Affiliation(s)
- Alana Muller
- University of Arizona, Tucson, AZ, USA.,California State University - San Bernardino, San Bernardino, CA, USA
| | - Lindsey A Sirianni
- California State University - San Bernardino, San Bernardino, CA, USA.,Behavioral Health & Performance Laboratory, Biomedical Research and Environmental Sciences Division, Human Health and Performance Directorate, KBR/NASA Johnson Space Center, Houston, TX, USA
| | - Richard J Addante
- California State University - San Bernardino, San Bernardino, CA, USA.,Florida Institute of Technology, Melbourne, FL, USA
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11
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Packard PA, Steiger TK, Fuentemilla L, Bunzeck N. Neural oscillations and event-related potentials reveal how semantic congruence drives long-term memory in both young and older humans. Sci Rep 2020; 10:9116. [PMID: 32499519 PMCID: PMC7272459 DOI: 10.1038/s41598-020-65872-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Accepted: 05/06/2020] [Indexed: 01/20/2023] Open
Abstract
Long-term memory can improve when incoming information is congruent with known semantic information. This so-called congruence effect has widely been shown in younger adults, but age-related changes and neural mechanisms remain unclear. Here, congruence improved recognition memory in younger and older adults (i.e. congruence effect), with only weak evidence for age-related decline in one behavioral study. In an EEG study, however, no significant behavioral differences in the congruence effect could be observed between age-groups. In line with this observation, electroencephalography data show that, in both groups, congruence led to widespread differences in Event-Related Potentials (ERPs), starting at around 400 ms after stimulus onset, and theta, alpha and beta oscillations (4-20 Hz). Importantly, these congruence-related ERPs were associated to increases in memory performance for congruent items, in both age groups. Finally, the described ERPs and neural oscillations in the theta-alpha range (5-13 Hz) were less pronounced in the elderly despite a preserved congruence effect. Together, semantic congruence increases long-term memory across the lifespan, and, at the neural level, this could be linked to neural oscillations in the theta, alpha and beta range, as well as ERPs that were previously associated with semantic processing.
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Affiliation(s)
- Pau A Packard
- Institute of Psychology I, University of Lübeck, 23562, Lübeck, Germany.
| | - Tineke K Steiger
- Institute of Psychology I, University of Lübeck, 23562, Lübeck, Germany
| | - Lluís Fuentemilla
- Cognition and Brain Plasticity Group, Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain
- Department of Cognition, Development and Educational Psychology, University of Barcelona, Barcelona, Spain
- Institute of Neurosciences, University of Barcelona, Barcelona, Spain
| | - Nico Bunzeck
- Institute of Psychology I, University of Lübeck, 23562, Lübeck, Germany.
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12
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Tanguay AFN, Palombo DJ, Atance CM, Renoult L, Davidson PSR. Scrutinizing the grey areas of declarative memory: Do the self-reference and temporal orientation of a trait knowledge task modulate the Late Positive Component (LPC)? Neuropsychologia 2020; 142:107444. [PMID: 32246950 DOI: 10.1016/j.neuropsychologia.2020.107444] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2019] [Revised: 03/22/2020] [Accepted: 03/23/2020] [Indexed: 11/27/2022]
Abstract
Knowledge about the future self may engage cognitive processes typically ascribed to episodic memory, such as awareness of the future self as an extension of the current self (i.e., autonoetic awareness) and the construction of future events. In a prior study (Tanguay et al., 2018), temporal orientation influenced the Late Positive Component (LPC), an ERP correlate of recollection. The LPC amplitude for present traits was intermediate between semantic and episodic memory, whereas thinking about one's future traits produced a larger LPC amplitude that was similar to episodic memory. Here, we examined further the effect of temporal orientation on the LPC amplitude and investigated if it was influenced by whether knowledge concerns the self or another person, with the proximity of the other being considered. Participants verified whether traits (e.g., Enthusiastic) were true of themselves and the "other," both now and in the future. Proximity of the other person was manipulated between subjects, such that participants either thought about the typical traits of a close friend (n = 31), or those of their age group more broadly (n = 35). Self-reference and temporal orientation interacted: The LPC amplitude for future knowledge was larger than for present knowledge, but only for the self. This effect of temporal orientation was not observed when participants thought about the traits of other people. The proximity of the other person did not modify these effects. Future-oriented cognition can engage different cognitive processes depending on self-reference; knowledge about the personal future increased the LPC amplitude unlike thinking about the future of other people. Our findings strengthen the notion of self-knowledge as a grey area between semantic and episodic memory.
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Affiliation(s)
- Annick F N Tanguay
- School of Psychology, University of Ottawa, Ottawa, Canada; Rotman Research Institute, Baycrest, Toronto, Canada.
| | - Daniela J Palombo
- Department of Psychology, University of British Columbia, Vancouver, Canada
| | | | - Louis Renoult
- School of Psychology, University of East Anglia, Norwich, UK
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13
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Hebscher M, Ibrahim C, Gilboa A. Precuneus stimulation alters the neural dynamics of autobiographical memory retrieval. Neuroimage 2020; 210:116575. [PMID: 31972285 DOI: 10.1016/j.neuroimage.2020.116575] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Revised: 01/03/2020] [Accepted: 01/19/2020] [Indexed: 11/18/2022] Open
Abstract
Autobiographical memory (AM) unfolds over time, but little is known about the dynamics of its retrieval. Space-based models of memory implicate the hippocampus, retrosplenial cortex, and precuneus in early memory computations. Here we used transcranial magnetic stimulation (TMS) and magnetoencephalography (MEG) to investigate the causal role of the precuneus in the dynamics of AM retrieval. During early memory search and construction, precuneus stimulation compared to vertex stimulation led to delayed evoked neural activity within 1000 ms after cue presentation. During later memory elaboration, stimulation led to decreased sustained positivity. We further identified a parietal late positive component during memory elaboration, the amplitude of which was associated with spatial perspective during recollection. This association was disrupted following precuneus stimulation, suggesting that this region plays an important role in the neural representation of spatial perspective during AM. These findings demonstrate a causal role for the precuneus in early AM retrieval, during memory search before a specific memory is accessed, and in spatial context reinstatement during the initial stages of memory elaboration and re-experiencing. By utilizing the high temporal resolution of MEG and the causality of TMS, this study helps clarify the neural correlates of early naturalistic memory retrieval.
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Affiliation(s)
- Melissa Hebscher
- Rotman Research Institute, Baycrest, Toronto, ON, M6A 2E1, Canada; Department of Psychology, University of Toronto, Toronto, ON, M5S 3G3, Canada.
| | | | - Asaf Gilboa
- Rotman Research Institute, Baycrest, Toronto, ON, M6A 2E1, Canada; Department of Psychology, University of Toronto, Toronto, ON, M5S 3G3, Canada; Toronto Rehabilitation Institute, University Health Network, Toronto, ON, M5G 2A2, Canada.
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14
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Jones R, Craig G, Bhattacharya J. Brain-Derived Neurotrophic Factor Val66Met Polymorphism Is Associated With a Reduced ERP Component Indexing Emotional Recollection. Front Psychol 2019; 10:1922. [PMID: 31496979 PMCID: PMC6712090 DOI: 10.3389/fpsyg.2019.01922] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Accepted: 08/05/2019] [Indexed: 12/17/2022] Open
Abstract
The Met allele of the brain-derived neurotrophic factor (BDNF) Val66Met polymorphism is associated with reduced functioning of the amygdala and hippocampus. It has been linked to major psychiatric conditions, including depression and post-traumatic stress disorder, and is associated with deficits in episodic memory. The precise mechanisms of the BDNF gene’s influence on emotional memory are not well characterized, especially its impact on recognition. Two electrophysiological experiments of emotional memory were run on two independent samples genotyped for BDNF Val66Met. Event-related potentials (ERPs) corresponding to the recognition of negative and neutral words (Experiment 1, N = 37) and negative and positive words (Experiment 2, N = 23) were recorded, and the late parietal component (LPC), typically associated with conscious recollection, was analyzed. In Experiment 1, a reduced LPC was observed in Met carriers (N = 12) compared to Val homozygotes (N = 25) in the negative condition, but the group difference was not present in the neutral condition. In Experiment 2, the reduced LPC was seen in Met carriers (N = 12) compared to Val homozygotes (N = 11) across both conditions. This study provides the first evidence of an association between the BDNF Val66Met genotype and the late parietal electrophysiological component, suggesting that the conscious experience of emotional recollection may differ according to BDNF Val66Met genotype. Further, these results suggest that this effect is likely due to emotional arousal rather than valence polarity. Results were discussed with reference to the possible mechanisms by which emotional recollection deficits may contribute to psychopathology.
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Affiliation(s)
- Rhiannon Jones
- Department of Psychology, University of Winchester, Winchester, United Kingdom.,Department of Psychology, University of Westminster, London, United Kingdom
| | - Gavin Craig
- Social, Genetic & Developmental Psychiatry Centre, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, United Kingdom
| | - Joydeep Bhattacharya
- Department of Psychology, Goldsmiths, University of London, London, United Kingdom
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15
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Irak M, Soylu C, Turan G, Çapan D. Neurobiological basis of feeling of knowing in episodic memory. Cogn Neurodyn 2019; 13:239-256. [PMID: 31168329 PMCID: PMC6520417 DOI: 10.1007/s11571-019-09520-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 12/03/2018] [Accepted: 01/04/2019] [Indexed: 11/28/2022] Open
Abstract
Feeling of knowing (FOK) is a metacognitive process which allows individuals to predict the likelihood that they will be able to remember, in the future, information which they currently cannot recall. Although FOK provides evidence for the mechanisms of metacognitive systems, the neurobiological basis of FOK is still unclear. We investigated the neural correlates of FOK induced by an episodic memory task in 77 younger adult participants. Data were gathered using event-related potentials (ERPs). ERP components during high, low, extremely high and extremely low FOK judgments were analyzed. Stimulus-locked ERP analyses indicated that FOK judgment was associated with greater positivity for P200 component at frontal, central, and parietal electrode zones and greater negativity for the N200 component at parietal electrode zones. Furthermore, results revealed that amplitude of the ERP components for FOK judgments were affected by the level of FOK judgment. Results suggest that ERP components of FOK judgment observed within a 200 ms time window support the perceptual fluency-based model.
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Affiliation(s)
- Metehan Irak
- Department of Psychology, Brain and Cognition Research Laboratory, Bahçeşehir University, Çırağan Cad. No: 4 Beşiktaş, 34353 Istanbul, Turkey
| | - Can Soylu
- Department of Psychology, Brain and Cognition Research Laboratory, Bahçeşehir University, Çırağan Cad. No: 4 Beşiktaş, 34353 Istanbul, Turkey
| | - Gözem Turan
- Department of Psychology, Brain and Cognition Research Laboratory, Bahçeşehir University, Çırağan Cad. No: 4 Beşiktaş, 34353 Istanbul, Turkey
| | - Dicle Çapan
- Department of Psychology, Koç University, Rumelifeneri Yolu, Sarıyer, 34450 Istanbul, Turkey
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16
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The ERP correlates of self-knowledge: Are assessments of one’s past, present, and future traits closer to semantic or episodic memory? Neuropsychologia 2018; 110:65-83. [DOI: 10.1016/j.neuropsychologia.2017.10.024] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 09/30/2017] [Accepted: 10/19/2017] [Indexed: 02/07/2023]
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17
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Kolarik BS, Baer T, Shahlaie K, Yonelinas AP, Ekstrom AD. Close but no cigar: Spatial precision deficits following medial temporal lobe lesions provide novel insight into theoretical models of navigation and memory. Hippocampus 2018; 28:31-41. [PMID: 28888032 PMCID: PMC5747326 DOI: 10.1002/hipo.22801] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Revised: 08/25/2017] [Accepted: 09/07/2017] [Indexed: 12/23/2022]
Abstract
Increasing evidence suggests that the human hippocampus contributes to a range of different behaviors, including episodic memory, language, short-term memory, and navigation. A novel theoretical framework, the Precision and Binding Model, accounts for these phenomenon by describing a role for the hippocampus in high-resolution, complex binding. Other theories like Cognitive Map Theory, in contrast, predict a specific role for the hippocampus in allocentric navigation, while Declarative Memory Theory predicts a specific role in delay-dependent conscious memory. Navigation provides a unique venue for testing these predictions, with past results from research with humans providing inconsistent findings regarding the role of the human hippocampus in spatial navigation. Here, we tested five patients with lesions primarily restricted to the hippocampus and those extending out into the surrounding medial temporal lobe cortex on a virtual water maze task. Consistent with the Precision and Binding Model, we found partially intact allocentric memory in all patients, with impairments in the spatial precision of their searches for a hidden target. We found similar impairments at both immediate and delayed testing. Our findings are consistent with the Precision and Binding Model of hippocampal function, arguing for its role across domains in high-resolution, complex binding. SIGNIFICANCE STATEMENT Remembering goal locations in one's environment is a critical skill for survival. How this information is represented in the brain is still not fully understood, but is believed to rely in some capacity on structures in the medial temporal lobe. Contradictory findings from studies of both humans and animals have been difficult to reconcile with regard to the role of the MTL, specifically the hippocampus. By assessing impairments observed during navigation to a goal in patients with medial temporal lobe damage we can better understand the role these structures play in such behavior. Utilizing virtual reality and novel analysis techniques, we have more precisely assessed the impact that medial temporal lobe damage has on spatial memory and navigation.
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Affiliation(s)
- Branden S Kolarik
- Department of Psychology, University of California, Davis, Davis, California, 95618
- Center for Neuroscience, University of California, Davis, Davis, California, 95618
| | - Trevor Baer
- Department of Psychology, University of California, Davis, Davis, California, 95618
- Center for Neuroscience, University of California, Davis, Davis, California, 95618
| | - Kiarash Shahlaie
- Department of Neurological Surgery, University of California, Davis, Sacramento, California, 95817
| | - Andrew P Yonelinas
- Department of Psychology, University of California, Davis, Davis, California, 95618
- Center for Neuroscience, University of California, Davis, Davis, California, 95618
| | - Arne D Ekstrom
- Department of Psychology, University of California, Davis, Davis, California, 95618
- Center for Neuroscience, University of California, Davis, Davis, California, 95618
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18
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MacLeod CA, Donaldson DI. Investigating the Functional Utility of the Left Parietal ERP Old/New Effect: Brain Activity Predicts within But Not between Participant Variance in Episodic Recollection. Front Hum Neurosci 2017; 11:580. [PMID: 29259551 PMCID: PMC5723330 DOI: 10.3389/fnhum.2017.00580] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 11/17/2017] [Indexed: 11/13/2022] Open
Abstract
A success story within neuroimaging has been the discovery of distinct neural correlates of episodic retrieval, providing insight into the processes that support memory for past life events. Here we focus on one commonly reported neural correlate, the left parietal old/new effect, a positive going modulation seen in event-related potential (ERP) data that is widely considered to index episodic recollection. Substantial evidence links changes in the size of the left parietal effect to changes in remembering, but the precise functional utility of the effect remains unclear. Here, using forced choice recognition of verbal stimuli, we present a novel population level test of the hypothesis that the magnitude of the left parietal effect correlates with memory performance. We recorded ERPs during old/new recognition, source accuracy and Remember/Know/Guess tasks in two large samples of healthy young adults, and successfully replicated existing within participant modulations of the magnitude of the left parietal effect with recollection. Critically, however, both datasets also show that across participants the magnitude of the left parietal effect does not correlate with behavioral measures of memory – including both subjective and objective estimates of recollection. We conclude that in these tasks, and across this healthy young adult population, the generators of the left parietal ERP effect do not index performance as expected. Taken together, these novel findings provide important constraints on the functional interpretation of the left parietal effect, suggesting that between group differences in the magnitude of old/new effects cannot always safely be used to infer differences in recollection.
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Affiliation(s)
- Catherine A MacLeod
- Dementia Services Development Centre Wales, School of Healthcare Sciences, Bangor University, Bangor, United Kingdom
| | - David I Donaldson
- Psychological Imaging Laboratory, Psychology, Faculty of Natural Sciences, University of Stirling, Stirling, United Kingdom
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19
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Desaunay P, Clochon P, Doidy F, Lambrechts A, Bowler DM, Gérardin P, Baleyte JM, Eustache F, Guillery-Girard B. Impact of Semantic Relatedness on Associative Memory: An ERP Study. Front Hum Neurosci 2017; 11:335. [PMID: 28706479 PMCID: PMC5489662 DOI: 10.3389/fnhum.2017.00335] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Accepted: 06/12/2017] [Indexed: 11/29/2022] Open
Abstract
Encoding and retrieval processes in memory for pairs of pictures are thought to be influenced by inter-item similarity and by features of individual items. Using Event-Related Potentials (ERP), we aimed to identify how these processes impact on both the early mid-frontal FN400 and the Late Positive Component (LPC) potentials during associative retrieval of pictures. Twenty young adults undertook a sham task, using an incidental encoding of semantically related and unrelated pairs of drawings. At test, we conducted a recognition task in which participants were asked to identify target identical pairs of pictures, which could be semantically related or unrelated, among new and rearranged pairs. We observed semantic (related and unrelated pairs) and condition effects (old, rearranged and new pairs) on the early mid-frontal potential. First, a lower amplitude was shown for identical and rearranged semantically related pairs, which might reflect a retrieval process driven by semantic cues. Second, among semantically unrelated pairs, we found a larger negativity for identical pairs, compared to rearranged and new ones, suggesting additional retrieval processing that focuses on associative information. We also observed an LPC old/new effect with a mid-parietal and a right occipito-parietal topography for semantically related and unrelated old pairs, demonstrating a recollection phenomenon irrespective of the degree of association. These findings suggest that associative recognition using visual stimuli begins at early stages of retrieval, and differs according to the degree of semantic relatedness among items. However, either strategy may ultimately lead to recollection processes.
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Affiliation(s)
- Pierre Desaunay
- Normandie Univ, UNICAEN, PSL Research University, EPHE, INSERM, U1077, CHU de Caen, Neuropsychologie et Imagerie de la Mémoire HumaineCaen, France.,Fédération Hospitalo-Universitaire de Psychiatrie de l'Enfant et de l'AdolescentRouen, France
| | - Patrice Clochon
- Normandie Univ, UNICAEN, PSL Research University, EPHE, INSERM, U1077, CHU de Caen, Neuropsychologie et Imagerie de la Mémoire HumaineCaen, France
| | - Franck Doidy
- Normandie Univ, UNICAEN, PSL Research University, EPHE, INSERM, U1077, CHU de Caen, Neuropsychologie et Imagerie de la Mémoire HumaineCaen, France
| | - Anna Lambrechts
- Normandie Univ, UNICAEN, PSL Research University, EPHE, INSERM, U1077, CHU de Caen, Neuropsychologie et Imagerie de la Mémoire HumaineCaen, France.,Department of Psychology, City, University of LondonLondon, United Kingdom
| | - Dermot M Bowler
- Normandie Univ, UNICAEN, PSL Research University, EPHE, INSERM, U1077, CHU de Caen, Neuropsychologie et Imagerie de la Mémoire HumaineCaen, France.,Department of Psychology, City, University of LondonLondon, United Kingdom
| | - Priscille Gérardin
- Fédération Hospitalo-Universitaire de Psychiatrie de l'Enfant et de l'AdolescentRouen, France
| | - Jean-Marc Baleyte
- Normandie Univ, UNICAEN, PSL Research University, EPHE, INSERM, U1077, CHU de Caen, Neuropsychologie et Imagerie de la Mémoire HumaineCaen, France.,Service de Psychiatrie de l'enfant et de l'adolescent, Centre Hospitalier Intercommunal de CréteilCréteil, France
| | - Francis Eustache
- Normandie Univ, UNICAEN, PSL Research University, EPHE, INSERM, U1077, CHU de Caen, Neuropsychologie et Imagerie de la Mémoire HumaineCaen, France
| | - Bérengère Guillery-Girard
- Normandie Univ, UNICAEN, PSL Research University, EPHE, INSERM, U1077, CHU de Caen, Neuropsychologie et Imagerie de la Mémoire HumaineCaen, France
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20
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Liesefeld HR, Liesefeld AM, Zimmer HD. Recollection is delayed under changed viewing conditions: A graded effect on the latency of the late posterior component. Psychophysiology 2016; 53:1811-1822. [PMID: 27628129 DOI: 10.1111/psyp.12760] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Accepted: 08/22/2016] [Indexed: 11/29/2022]
Abstract
Object recognition is a central human ability. In everyday life, the conditions under which objects have to be recognized are usually not perfect. Often, viewing conditions change in between two encounters with an object; typical are changes in illumination or in the object-observer distance. With such changes, object recognition sometimes feels slightly delayed. We examined this phenomenon empirically by measuring the latency of the well-established electrophysiological correlate of recollection, the late posterior component (LPC), in an object-recognition task. Although the cognitive processes underlying successful recognition are well examined, thus far the consequences of changed viewing conditions on the timing of these processes have not been investigated. The ERP technique is well suited for investigating this question, because it allows differentiating between processes contributing to recognition times (in particular, recollection from familiarity as indexed by the FN400 component) and measuring their time course with high temporal precision. In the present study, participants' task was to differentiate previously studied (old) objects from a set of new objects. Viewing conditions for old objects changed slightly, changed strongly, or remained identical between learning and test. We found that the latency of the LPC in response to an old object was delayed whenever viewing conditions changed. Moreover, this delay in LPC latency scaled with the size of the change. These effects were absent for the FN400. This is the first examination of effects of changes in viewing conditions on the latency of recollection and the first dissociation of FN400 and LPC latencies.
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Affiliation(s)
| | - Anna M Liesefeld
- Department of Psychology, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Hubert D Zimmer
- Department of Psychology, Saarland University, Saarbrücken, Germany
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21
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Mecklinger A, Rosburg T, Johansson M. Reconstructing the past: The late posterior negativity (LPN) in episodic memory studies. Neurosci Biobehav Rev 2016; 68:621-638. [DOI: 10.1016/j.neubiorev.2016.06.024] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Revised: 06/17/2016] [Accepted: 06/17/2016] [Indexed: 10/21/2022]
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22
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Renoult L, Tanguay A, Beaudry M, Tavakoli P, Rabipour S, Campbell K, Moscovitch M, Levine B, Davidson PS. Personal semantics: Is it distinct from episodic and semantic memory? An electrophysiological study of memory for autobiographical facts and repeated events in honor of Shlomo Bentin. Neuropsychologia 2016; 83:242-256. [DOI: 10.1016/j.neuropsychologia.2015.08.013] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Revised: 08/09/2015] [Accepted: 08/11/2015] [Indexed: 11/16/2022]
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23
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Tsivilis D, Allan K, Roberts J, Williams N, Downes JJ, El-Deredy W. Old-new ERP effects and remote memories: the late parietal effect is absent as recollection fails whereas the early mid-frontal effect persists as familiarity is retained. Front Hum Neurosci 2015; 9:532. [PMID: 26528163 PMCID: PMC4604239 DOI: 10.3389/fnhum.2015.00532] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Accepted: 09/14/2015] [Indexed: 01/09/2023] Open
Abstract
Understanding the electrophysiological correlates of recognition memory processes has been a focus of research in recent years. This study investigated the effects of retention interval on recognition memory by comparing memory for objects encoded four weeks (remote) or 5 min (recent) before testing. In Experiment 1, event related potentials (ERPs) were acquired while participants performed a yes-no recognition memory task involving remote, recent and novel objects. Relative to correctly rejected new items, remote and recent hits showed an attenuated frontal negativity from 300–500 ms post-stimulus. This effect, also known as the FN400, has been previously associated with familiarity memory. Recent and remote recognition ERPs did not differ from each other at this time-window. By contrast, recent but not remote recognition showed increased parietal positivity from around 500 ms post-stimulus. This late parietal effect (LPE), which is considered a correlate of recollection-related processes, also discriminated between recent and remote memories. A second, behavioral experiment confirmed that remote memories unlike recent memories were based almost exclusively on familiarity. These findings support the idea that the FN400 and LPE are indices of familiarity and recollection memory, respectively and show that remote and recent memories are functionally and anatomically distinct.
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Affiliation(s)
| | - Kevin Allan
- School of Psychology, University of Aberdeen Aberdeen, UK
| | - Jenna Roberts
- School of Psychological Sciences, University of Manchester Manchester, UK
| | | | | | - Wael El-Deredy
- School of Psychological Sciences, University of Manchester Manchester, UK ; School of Biomedical Engineering, University of Valparaiso Valparaiso, Chile
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24
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Palombo DJ, Alain C, Söderlund H, Khuu W, Levine B. Severely deficient autobiographical memory (SDAM) in healthy adults: A new mnemonic syndrome. Neuropsychologia 2015; 72:105-18. [PMID: 25892594 DOI: 10.1016/j.neuropsychologia.2015.04.012] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Revised: 04/07/2015] [Accepted: 04/12/2015] [Indexed: 01/06/2023]
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25
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Hoppstädter M, Baeuchl C, Diener C, Flor H, Meyer P. Simultaneous EEG-fMRI reveals brain networks underlying recognition memory ERP old/new effects. Neuroimage 2015; 116:112-22. [PMID: 25988228 DOI: 10.1016/j.neuroimage.2015.05.026] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Revised: 05/07/2015] [Accepted: 05/11/2015] [Indexed: 11/15/2022] Open
Abstract
The mapping of event-related potentials (ERP) on functional magnetic resonance imaging (fMRI) data remains difficult as scalp electroencephalography (EEG) is assumed to be largely insensitive to deep brain structures. Simultaneous recordings of EEG and fMRI might be helpful in reconciling surface ERPs with hemodynamic activations in medial temporal lobe structures related to recognition memory. EEG and imaging studies provide evidence for two independent processes underlying recognition memory, namely recollection and familiarity. Recollection reflects the conscious retrieval of contextual information about a specific episode, while familiarity refers to an acontextual feeling of knowing. Both processes were related to two spatiotemporally different ERP effects, namely the early mid-frontal old/new effect (familiarity) and the late parietal old new effect (recollection). We conducted an exploratory simultaneous EEG-fMRI study using a recognition memory paradigm to investigate which brain activations are modulated in relation to the ERP old/new effects. To this end we examined 17 participants in a yes/no recognition task with word stimuli. Single-trial amplitudes of ERP old/new effects were related to the hemodynamic signal in an EEG-informed fMRI analysis for a subset of 12 subjects. FMRI activation in the right dorsolateral prefrontal cortex and the right intraparietal sulcus was associated with the amplitude of the early frontal old/new effect (350-550ms), and activation in the right posterior hippocampus, parahippocampal cortex and retrosplenial cortex was associated with the amplitude of the late parietal old new effect (580-750ms). These results provide the first direct link between electrophysiological and hemodynamic correlates of familiarity and recollection. Moreover, these findings in healthy subjects complement data from intracranial ERP recordings in epilepsy patients and lesion studies in hypoxia patients.
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Affiliation(s)
- Michael Hoppstädter
- Department of Cognitive and Clinical Neuroscience, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, J5, 68159 Mannheim, Germany; Bernstein Center for Computational Neuroscience Heidelberg/Mannheim, Germany.
| | - Christian Baeuchl
- Department of Cognitive and Clinical Neuroscience, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, J5, 68159 Mannheim, Germany; Bernstein Center for Computational Neuroscience Heidelberg/Mannheim, Germany.
| | - Carsten Diener
- Department of Cognitive and Clinical Neuroscience, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, J5, 68159 Mannheim, Germany; Bernstein Center for Computational Neuroscience Heidelberg/Mannheim, Germany.
| | - Herta Flor
- Department of Cognitive and Clinical Neuroscience, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, J5, 68159 Mannheim, Germany; Bernstein Center for Computational Neuroscience Heidelberg/Mannheim, Germany.
| | - Patric Meyer
- Department of Cognitive and Clinical Neuroscience, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, J5, 68159 Mannheim, Germany; Bernstein Center for Computational Neuroscience Heidelberg/Mannheim, Germany.
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26
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Addante RJ. A critical role of the human hippocampus in an electrophysiological measure of implicit memory. Neuroimage 2015; 109:515-28. [PMID: 25562828 DOI: 10.1016/j.neuroimage.2014.12.069] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Revised: 12/17/2014] [Accepted: 12/25/2014] [Indexed: 02/05/2023] Open
Abstract
The hippocampus has traditionally been thought to be critical for conscious explicit memory but not necessary for unconscious implicit memory processing. In a recent study of a group of mild amnesia patients with evidence of MTL damage limited to the hippocampus, subjects were tested on a direct test of item recognition confidence while electroencephalogram (EEG) was acquired, and revealed intact measures of explicit memory from 400 to 600 ms (mid-frontal old-new effect, FN400). The current investigation re-analyzed this data to study event-related potentials (ERPs) of implicit memory, using a recently developed procedure that eliminated declarative memory differences. Prior ERP findings from this technique were first replicated in two independent matched control groups, which exhibited reliable implicit memory effects in posterior scalp regions from 400 to 600 ms, which were topographically dissociated from the explicit memory effects of familiarity. However, patients were found to be dramatically impaired in implicit memory effects relative to control subjects, as quantified by a reliable condition × group interaction. Several control analyses were conducted to consider alternative factors that could account for the results, including outliers, sample size, age, or contamination by explicit memory, and each of these factors was systematically ruled out. Results suggest that the hippocampus plays a fundamental role in aspects of memory processing that are beyond conscious awareness. The current findings therefore indicate that both memory systems of implicit and explicit memory may rely upon the same neural structures - but function in different physiological ways.
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Affiliation(s)
- Richard James Addante
- University of Texas at Dallas, School of Behavioral and Brain Sciences, Richardson, TX 75080, USA; University of California, Davis, Center for Neuroscience, Davis, CA 95616, USA.
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27
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Renoult L, Davidson PSR, Schmitz E, Park L, Campbell K, Moscovitch M, Levine B. Autobiographically Significant Concepts: More Episodic than Semantic in Nature? An Electrophysiological Investigation of Overlapping Types of Memory. J Cogn Neurosci 2015; 27:57-72. [DOI: 10.1162/jocn_a_00689] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Abstract
A common assertion is that semantic memory emerges from episodic memory, shedding the distinctive contexts associated with episodes over time and/or repeated instances. Some semantic concepts, however, may retain their episodic origins or acquire episodic information during life experiences. The current study examined this hypothesis by investigating the ERP correlates of autobiographically significant (AS) concepts, that is, semantic concepts that are associated with vivid episodic memories. We inferred the contribution of semantic and episodic memory to AS concepts using the amplitudes of the N400 and late positive component, respectively. We compared famous names that easily brought to mind episodic memories (high AS names) against equally famous names that did not bring such recollections to mind (low AS names) on a semantic task (fame judgment) and an episodic task (recognition memory). Compared with low AS names, high AS names were associated with increased amplitude of the late positive component in both tasks. Moreover, in the recognition task, this effect of AS was highly correlated with recognition confidence. In contrast, the N400 component did not differentiate the high versus low AS names but, instead, was related to the amount of general knowledge participants had regarding each name. These results suggest that semantic concepts high in AS, such as famous names, have an episodic component and are associated with similar brain processes to those that are engaged by episodic memory. Studying AS concepts may provide unique insights into how episodic and semantic memory interact.
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Affiliation(s)
| | | | | | - Lillian Park
- 3State University of New York College at Old Westbury
| | | | | | - Brian Levine
- 4Rotman Research Institute, Baycrest, Toronto, Ontario, Canada
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28
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Kipp KH, Mecklinger A, Brunnemann N, Shamdeen MG, Meng-Hentschel J, Gortner L. Modifications of recognition memory processes in preterm children: an event-related potential study. Child Dev 2014; 86:379-93. [PMID: 25521668 DOI: 10.1111/cdev.12323] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Prematurity may cause hippocampal compromise. Therefore, hippocampus-dependent memory processes (recollection-based retrieval) may be more impaired than hippocampus-independent processes (familiarity-based retrieval). The memory of 18 children born preterm with reduced hippocampal volumes, without neonatal complications (weeks of gestation < 34, weight < 1,600 g), and 15 controls (8-10 years) was tested using an item recognition task. While groups were equal in memory performance, dissociation was found: The event-related potential (ERP) correlate of familiarity was intact in the preterm group, whereas the correlate of recollection was attenuated. A follow-up experiment ruled out that this was due to general cognitive deficits. Furthermore, gestational age correlated with the ERP index of recollection. Thus, recognition memory in preterm children may be characterized by a compensation of attenuated recollection by familiarity.
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29
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Windmann S, Hill H. Dissociating electrophysiological correlates of subjective, objective, and correct memory in investigating the emotion-induced recognition bias. Conscious Cogn 2014; 29:199-211. [PMID: 25286129 DOI: 10.1016/j.concog.2014.08.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Revised: 07/29/2014] [Accepted: 08/13/2014] [Indexed: 10/24/2022]
Abstract
Performance on tasks requiring discrimination of at least two stimuli can be viewed either from an objective perspective (referring to actual stimulus differences), or from a subjective perspective (corresponding to participant's responses). Using event-related potentials recorded during an old/new recognition memory test involving emotionally laden and neutral words studied either blockwise or randomly intermixed, we show here how the objective perspective (old versus new items) yields late effects of blockwise emotional item presentation at parietal sites that the subjective perspective fails to find, whereas the subjective perspective ("old" versus "new" responses) is more sensitive to early effects of emotion at anterior sites than the objective perspective. Our results demonstrate the potential advantage of dissociating the subjective and the objective perspective onto task performance (in addition to analyzing trials with correct responses), especially for investigations of illusions and information processing biases, in behavioral and cognitive neuroscience studies.
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Affiliation(s)
| | - Holger Hill
- Johann Wolfgang Goethe University, Frankfurt, Germany
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30
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Electrophysiological correlates of processes supporting memory for faces. Brain Cogn 2014; 90:50-62. [DOI: 10.1016/j.bandc.2014.06.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Revised: 05/26/2014] [Accepted: 06/04/2014] [Indexed: 11/20/2022]
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How does testing affect retrieval-related processes? An event-related potential (ERP) study on the short-term effects of repeated retrieval. COGNITIVE AFFECTIVE & BEHAVIORAL NEUROSCIENCE 2014; 15:195-210. [DOI: 10.3758/s13415-014-0310-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Mullally SL, Maguire EA. Learning to remember: the early ontogeny of episodic memory. Dev Cogn Neurosci 2014; 9:12-29. [PMID: 24480487 PMCID: PMC4071442 DOI: 10.1016/j.dcn.2013.12.006] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Revised: 12/04/2013] [Accepted: 12/23/2013] [Indexed: 12/12/2022] Open
Abstract
Over the past 60 years the neural correlates of human episodic memory have been the focus of intense neuroscientific scrutiny. By contrast, neuroscience has paid substantially less attention to understanding the emergence of this neurocognitive system. In this review we consider how the study of memory development has evolved. In doing so, we concentrate primarily on the first postnatal year because it is within this time window that the most dramatic shifts in scientific opinion have occurred. Moreover, this time frame includes the critical age (∼9 months) at which human infants purportedly first begin to demonstrate rudimentary hippocampal-dependent memory. We review the evidence for and against this assertion, note the lack of direct neurocognitive data speaking to this issue, and question how demonstrations of exuberant relational learning and memory in infants as young as 3-months old can be accommodated within extant models. Finally, we discuss whether current impasses in the infant memory literature could be leveraged by making greater use of neuroimaging techniques, such as magnetic resonance imaging (MRI), which have been deployed so successfully in adults.
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Affiliation(s)
- Sinéad L Mullally
- Institute of Neuroscience, Faculty of Medical Sciences, Newcastle University, United Kingdom.
| | - Eleanor A Maguire
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, United Kingdom.
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Rosenbaum RS, Gilboa A, Moscovitch M. Case studies continue to illuminate the cognitive neuroscience of memory. Ann N Y Acad Sci 2014; 1316:105-33. [DOI: 10.1111/nyas.12467] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- R. Shayna Rosenbaum
- Department of Psychology; York University; Toronto Ontario Canada
- Rotman Research Institute; Baycrest; Toronto Ontario Canada
- Canadian Partnership in Stroke Recovery, Baycrest; Toronto Ontario Canada
| | - Asaf Gilboa
- Rotman Research Institute; Baycrest; Toronto Ontario Canada
- Canadian Partnership in Stroke Recovery, Baycrest; Toronto Ontario Canada
- Department of Psychology; University of Toronto; Toronto Ontario Canada
| | - Morris Moscovitch
- Rotman Research Institute; Baycrest; Toronto Ontario Canada
- Department of Psychology; University of Toronto; Toronto Ontario Canada
- Department of Psychology, Baycrest; Toronto Ontario Canada
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Abstract
Long-term memories are linked to cortical representations of perceived events, but it is unclear which types of representations can later be recollected. Using magnetoencephalography-based decoding, we examined which brain activity patterns elicited during encoding are later replayed during recollection in the human brain. The results show that the recollection of images depicting faces and scenes is associated with a replay of neural representations that are formed at very early (180 ms) stages of encoding. This replay occurs quite rapidly, ~500 ms after the onset of a cue that prompts recollection and correlates with source memory accuracy. Therefore, long-term memories are rapidly replayed during recollection and involve representations that were formed at very early stages of encoding. These findings indicate that very early representational information can be preserved in the memory engram and can be faithfully and rapidly reinstated during recollection. These novel insights into the nature of the memory engram provide constraints for mechanistic models of long-term memory function.
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Wolk DA, Manning K, Kliot D, Arnold SE. Recognition memory in amnestic-mild cognitive impairment: insights from event-related potentials. Front Aging Neurosci 2013; 5:89. [PMID: 24376418 PMCID: PMC3858817 DOI: 10.3389/fnagi.2013.00089] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Accepted: 11/20/2013] [Indexed: 11/13/2022] Open
Abstract
Episodic memory loss is the hallmark cognitive dysfunction associated with Alzheimer’s disease (AD). Amnestic mild cognitive impairment (a-MCI) frequently represents a transitional stage between normal aging and early AD. A better understanding of the qualitative features of memory loss in a-MCI may have important implications for predicting those most likely to harbor AD-related pathology and for disease monitoring. Dual process models of memory argue that recognition memory is subserved by the dissociable processes of recollection and familiarity. Work studying recognition memory in a-MCI from this perspective has been controversial, particularly with regard to the integrity of familiarity. Event-related potentials (ERPs) offer an alternative means for assessing these functions without the associated assumptions of behavioral estimation methods. ERPs were recorded while a-MCI patients and cognitively normal (CN) age-matched adults performed a recognition memory task. When retrieval success was measured (hits versus correct rejections) in which performance was matched by group, a-MCI patients displayed similar neural correlates to that of the CN group, including modulation of the FN400 and the late positive complex (LPC) which are thought to index familiarity and recollection, respectively. Alternatively, when the integrity of these components was measured based on retrieval attempts (studied versus unstudied items), a-MCI patients displayed a reduced FN400 and LPC. Furthermore, modulation of the FN400 correlated with a behavioral estimate of familiarity and the LPC with a behavioral estimate of recollection obtained in a separate experiment in the same individuals, consistent with the proposed mappings of these indices. These results support a global decline of recognition memory in a-MCI, which suggests that the memory loss of prodromal AD may be qualitatively distinct from normal aging.
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Affiliation(s)
- David A Wolk
- Department of Neurology, University of Pennsylvania, Philadelphia PA, USA ; Penn Memory Center, University of Pennsylvania, Philadelphia PA, USA
| | - Katharine Manning
- Department of Neurology, University of Pennsylvania, Philadelphia PA, USA ; Penn Memory Center, University of Pennsylvania, Philadelphia PA, USA
| | - Daria Kliot
- Department of Neurology, University of Pennsylvania, Philadelphia PA, USA ; Penn Memory Center, University of Pennsylvania, Philadelphia PA, USA
| | - Steven E Arnold
- Department of Neurology, University of Pennsylvania, Philadelphia PA, USA ; Penn Memory Center, University of Pennsylvania, Philadelphia PA, USA ; Department of Psychiatry, University of Pennsylvania, Philadelphia PA, USA
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Bender AR, Daugherty AM, Raz N. Vascular Risk Moderates Associations between Hippocampal Subfield Volumes and Memory. J Cogn Neurosci 2013; 25:1851-62. [DOI: 10.1162/jocn_a_00435] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Abstract
Advanced age and vascular risk negatively affect episodic memory. The hippocampus (HC) is a complex structure, and little is known about the roles of different HC regions in age-related memory declines. Using data from an ongoing longitudinal study, we investigated whether memory functions are related to volumes of specific HC subregions (CA1-2, CA3-4/dentate gyrus, and subiculum). Furthermore, we inquired if arterial hypertension, a common age-related vascular risk factor, modifies age-related differences in HC regional volumes, concurrent memory performance, and improvement in memory over multiple administrations. Healthy adults (n = 49, 52–82 years old) completed associative recognition and free recall tasks. In grouped path models, covariance structures differed between hypertensive and normotensive participants. Whereas larger CA3-4/dentate gyrus volumes predicted greater improvement in associative memory over repeated tests regardless of vascular risk, CA1-2 volumes were associated with improvement in noun recall only in hypertensive participants. Only among hypertensive participants, CA1-2 volumes negatively related to age and CA3-4/dentate gyrus and CA1-2 volumes were associated with performance at the last measurement occasion. These findings suggest that relatively small regions of the HC may play a role in age-related memory declines and that vascular risk factors associated with advanced age may modify that relationship.
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Depue BE, Ketz N, Mollison MV, Nyhus E, Banich MT, Curran T. ERPs and Neural Oscillations during Volitional Suppression of Memory Retrieval. J Cogn Neurosci 2013; 25:1624-33. [DOI: 10.1162/jocn_a_00418] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Abstract
Although investigations of memory and the dynamics of ERP components and neural oscillations as assessed through EEG have been well utilized, little research into the volitional nature of suppression over memory retrieval have used these methods. Oscillation analyses conducted on the Think/No-Think (TNT) task and volitional suppression of retrieval are of interest to broaden our knowledge of neural oscillations associated not only during successful memory retrieval but also when retrieval is unwanted or suppressed. In the current study, we measured EEG during a TNT task and performed ERP and EEG spectral power band analyses. ERP results replicated other researchers' observations of increases in 500–800 msec parietal effects for items where retrieval was instructed to be elaborated compared with being suppressed. Furthermore, EEG analyses indicated increased alpha (8–12 Hz) and theta (3–8 Hz) oscillations across parietal electrodes for items that were instructed to be suppressed versus those to be elaborated. Additionally, during the second half of the experiment (after repeated attempts at control), increases in theta oscillations were found across both frontal and parietal electrodes for items that were instructed to be suppressed and that were ultimately forgotten versus those ultimately remembered. Increased alpha power for items that were instructed to be suppressed versus elaborated may indicate reductions of retrieval attempts or lack of retrieval success. Increased theta power for items that were instructed to be suppressed versus elaborated may indicate increased or prolonged cognitive control to monitor retrieval events.
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Affiliation(s)
| | | | | | | | - Marie T. Banich
- 1University of Colorado-Boulder
- 3University of Colorado-Denver
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Hoppstädter M, King AV, Frölich L, Wessa M, Flor H, Meyer P. A combined electrophysiological and morphological examination of episodic memory decline in amnestic mild cognitive impairment. Front Aging Neurosci 2013; 5:51. [PMID: 24065918 PMCID: PMC3779812 DOI: 10.3389/fnagi.2013.00051] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Accepted: 08/28/2013] [Indexed: 11/25/2022] Open
Abstract
Early stages of Alzheimer’s disease (AD) are characterized by neuropathological changes within the medial temporal lobe cortex (MTLC), which lead to characteristic impairments in episodic memory, i.e., amnestic mild cognitive impairment (aMCI). Here, we tested the neural correlates of this memory impairment using event-related potentials (ERPs) and voxel-based morphometry. Twenty-four participants were instructed to encode lists of words and were tested in a yes/no recognition memory task. The dual-process model of recognition memory dissociates between acontextual familiarity and recollection of contextual details. The early frontal ERP old/new effect, which is thought to represent a neural correlate of familiarity-based memory, was absent in aMCI, whereas the control group showed a significant early old/new effect at frontal electrodes. This effect was positively correlated with behavioral episodic memory performance. Analyses of brain morphology revealed a focused gray matter loss in the inferior and medial temporal lobes in aMCI versus healthy controls. Moreover, the positive correlation between gray matter volume in the MTLC and the familiarity-related early frontal old/new effect supports the notion that this effect relies upon the integrity of the MTLC. Thus, the present findings might provide a further functional marker for prodromal AD.
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Affiliation(s)
- Michael Hoppstädter
- Department of Cognitive and Clinical Neuroscience, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University Mannheim, Germany
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Ando S, Hatamoto Y, Sudo M, Kiyonaga A, Tanaka H, Higaki Y. The effects of exercise under hypoxia on cognitive function. PLoS One 2013; 8:e63630. [PMID: 23675496 PMCID: PMC3651238 DOI: 10.1371/journal.pone.0063630] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2012] [Accepted: 04/04/2013] [Indexed: 11/18/2022] Open
Abstract
Increasing evidence suggests that cognitive function improves during a single bout of moderate exercise. In contrast, exercise under hypoxia may compromise the availability of oxygen. Given that brain function and tissue integrity are dependent on a continuous and sufficient oxygen supply, exercise under hypoxia may impair cognitive function. However, it remains unclear how exercise under hypoxia affects cognitive function. The purpose of this study was to examine the effects of exercise under different levels of hypoxia on cognitive function. Twelve participants performed a cognitive task at rest and during exercise at various fractions of inspired oxygen (FIO2: 0.209, 0.18, and 0.15). Exercise intensity corresponded to 60% of peak oxygen uptake under normoxia. The participants performed a Go/No-Go task requiring executive control. Cognitive function was evaluated using the speed of response (reaction time) and response accuracy. We monitored pulse oximetric saturation (SpO2) and cerebral oxygenation to assess oxygen availability. SpO2 and cerebral oxygenation progressively decreased during exercise as the FIO2 level decreased. Nevertheless, the reaction time in the Go-trial significantly decreased during moderate exercise. Hypoxia did not affect reaction time. Neither exercise nor difference in FIO2 level affected response accuracy. An additional experiment indicated that cognitive function was not altered without exercise. These results suggest that the improvement in cognitive function is attributable to exercise, and that hypoxia has no effects on cognitive function at least under the present experimental condition. Exercise-cognition interaction should be further investigated under various environmental and exercise conditions.
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Affiliation(s)
- Soichi Ando
- Faculty of Sports and Health Science, Fukuoka University, Fukuoka, Japan.
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