{"title":"The hippocampus and implicit memory (by any other name).","authors":"E. Spaak","doi":"10.1080/17588928.2024.2343651","DOIUrl":"https://doi.org/10.1080/17588928.2024.2343651","url":null,"abstract":"Is the hippocampus involved in implicit memory? I argue that contemporary views on hippocampal function, going beyond the classic dichotomy of explicit versus implicit, predict involvement of the hippocampus whenever flexible, predictive associations are rapidly encoded. This involvement is independent of conscious awareness. A paradigm case is statistical learning: the unconscious extraction of statistical regularities from the environment. In line with this, a substantial body of literature on contextual cueing in visual search has established hippocampal involvement in this form of implicit learning. To conclude, implicit memory (as such or by any other name) is associated with the hippocampus.","PeriodicalId":10413,"journal":{"name":"Cognitive Neuroscience","volume":"3 8","pages":"1-2"},"PeriodicalIF":2.0,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140653024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Unconscious processing effects manifest only if conscious processing is excluded.","authors":"Katharina Henke, S. Ruch","doi":"10.1080/17588928.2024.2343658","DOIUrl":"https://doi.org/10.1080/17588928.2024.2343658","url":null,"abstract":"In their discussion paper Steinkrauss and Slotnick argue against a role for the hippocampus in unconscious memory formation and retrieval. Unfortunately, they omitted highly relevant evidence that supports a role for the hippocampus in unconscious memory. They criticize four articles, two from our laboratory, pointing out long-known confounds like residual consciousness. We uncover these reproaches as untrue allegations. In our own interest, we prevented conscious mnemonic processing because reliable unconscious memory effects manifest only if consciousness is completely excluded, and because we always knew that residual consciousness would be our Achilles heel for the proponents of the 'explicit memory dogma.'","PeriodicalId":10413,"journal":{"name":"Cognitive Neuroscience","volume":"1 4","pages":"1-2"},"PeriodicalIF":2.0,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140652667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Dismissing the role of the hippocampus in implicit memory is special pleading","authors":"Marc Alain Züst","doi":"10.1080/17588928.2024.2343663","DOIUrl":"https://doi.org/10.1080/17588928.2024.2343663","url":null,"abstract":"Steinkrauss and Slotnick (this issue) argue against hippocampal involvement in implicit memory, bringing up some important considerations. Their critique, however, exhibits significant flaws. The a...","PeriodicalId":10413,"journal":{"name":"Cognitive Neuroscience","volume":"7 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140636970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Concerns about confounds: False memory as an explanation for a hippocampus-supported implicit eye-movement-based relational memory effect","authors":"Deborah E. Hannula","doi":"10.1080/17588928.2024.2343655","DOIUrl":"https://doi.org/10.1080/17588928.2024.2343655","url":null,"abstract":"Steinkrauss and Slotnick (2024) propose that implicit eye-movement-based relational memory effects, predicted by hippocampal activity differences (Hannula & Ranganath, 2009), are due to an explicit...","PeriodicalId":10413,"journal":{"name":"Cognitive Neuroscience","volume":"38 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140636989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"When perception fades, the hippocampus may support implicit memory","authors":"Clive R. Rosenthal","doi":"10.1080/17588928.2024.2343654","DOIUrl":"https://doi.org/10.1080/17588928.2024.2343654","url":null,"abstract":"Steinkrauss and Slotnick (2024) conclude that current evidence is insufficient to sustain a link between implicit memory and the hippocampus. However, behavioral protocols designed to minimize visu...","PeriodicalId":10413,"journal":{"name":"Cognitive Neuroscience","volume":"1 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140636975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Preston P. Thakral, Elizabeth R. Cutting, Kiera E. Lawless
{"title":"The dead salmon strikes again: Reports of unconscious processing in the hippocampus may reflect Type-I error","authors":"Preston P. Thakral, Elizabeth R. Cutting, Kiera E. Lawless","doi":"10.1080/17588928.2024.2343667","DOIUrl":"https://doi.org/10.1080/17588928.2024.2343667","url":null,"abstract":"Steinkrauss and Slotnick (2024) reviewed neuroimaging studies linking the hippocampus with implicit memory. They conclude that there is no convincing evidence that the hippocampus is associated wit...","PeriodicalId":10413,"journal":{"name":"Cognitive Neuroscience","volume":"141 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140637094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cognitive NeurosciencePub Date : 2024-04-01Epub Date: 2024-02-21DOI: 10.1080/17588928.2024.2315818
Thomas D Miller, Christopher Kennard, Penny A Gowland, Chrystalina A Antoniades, Clive R Rosenthal
{"title":"Differential effects of bilateral hippocampal CA3 damage on the implicit learning and recognition of complex event sequences.","authors":"Thomas D Miller, Christopher Kennard, Penny A Gowland, Chrystalina A Antoniades, Clive R Rosenthal","doi":"10.1080/17588928.2024.2315818","DOIUrl":"10.1080/17588928.2024.2315818","url":null,"abstract":"<p><p>Learning regularities in the environment is a fundament of human cognition, which is supported by a network of brain regions that include the hippocampus. In two experiments, we assessed the effects of selective bilateral damage to human hippocampal subregion CA3, which was associated with autobiographical episodic amnesia extending ~50 years prior to the damage, on the ability to recognize complex, deterministic event sequences presented either in a spatial or a non-spatial configuration. In contrast to findings from related paradigms, modalities, and homologue species, hippocampal damage did not preclude recognition memory for an event sequence studied and tested at four spatial locations, whereas recognition memory for an event sequence presented at a single location was at chance. In two additional experiments, recognition memory for novel single-items was intact, whereas the ability to recognize novel single-items in a different location from that presented at study was at chance. The results are at variance with a general role of the hippocampus in the learning and recognition of complex event sequences based on non-adjacent spatial and temporal dependencies. We discuss the impact of the results on established theoretical accounts of the hippocampal contributions to implicit sequence learning and episodic memory.</p>","PeriodicalId":10413,"journal":{"name":"Cognitive Neuroscience","volume":" ","pages":"27-55"},"PeriodicalIF":2.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11147457/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139930366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cognitive NeurosciencePub Date : 2024-04-01Epub Date: 2024-02-18DOI: 10.1080/17588928.2024.2315816
Ashley C Steinkrauss, Scott D Slotnick
{"title":"Is implicit memory associated with the hippocampus?","authors":"Ashley C Steinkrauss, Scott D Slotnick","doi":"10.1080/17588928.2024.2315816","DOIUrl":"10.1080/17588928.2024.2315816","url":null,"abstract":"<p><p>According to the traditional memory-systems view, the hippocampus is critical during explicit (conscious) long-term memory, whereas other brain regions support implicit (nonconscious) memory. In the last two decades, some fMRI studies have reported hippocampal activity during implicit memory tasks. The aim of the present discussion paper was to identify whether any implicit memory fMRI studies have provided convincing evidence that the hippocampus is associated with nonconscious processes without being confounded by conscious processes. Experimental protocol and analysis parameters included the stimulus type(s), task(s), measures of subjective awareness, explicit memory accuracy, the relevant fMRI contrast(s) or analysis, and confound(s). A systematic review was conducted to identify implicit memory studies that reported fMRI activity in the hippocampus. After applying exclusion criteria, 13 articles remained for analysis. We found that there were no implicit memory fMRI studies where subjective awareness was absent, explicit memory performance was at chance, and there were no confounds that could have driven the observed hippocampal activity. The confounds included explicit memory (including false memory), imbalanced attentional states between conditions (yielding activation of the default-mode network), imbalanced stimuli between conditions, and differential novelty. As such, not a single fMRI study provided convincing evidence that implicit memory was associated with the hippocampus. Neuropsychological evidence was also considered, and implicit memory deficits were caused by factors known to disrupt brain regions beyond the hippocampus, such that the behavioral effects could not be attributed to this region. The present results indicate that implicit memory is not associated with the hippocampus.</p>","PeriodicalId":10413,"journal":{"name":"Cognitive Neuroscience","volume":" ","pages":"56-70"},"PeriodicalIF":2.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139899447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cognitive NeurosciencePub Date : 2024-04-01Epub Date: 2024-05-20DOI: 10.1080/17588928.2024.2354706
Scott D Slotnick
{"title":"The hippocampus and implicit memory.","authors":"Scott D Slotnick","doi":"10.1080/17588928.2024.2354706","DOIUrl":"10.1080/17588928.2024.2354706","url":null,"abstract":"<p><p>The traditional memory-systems view is that explicit (conscious) long-term memory is associated with the hippocampus and implicit (nonconscious) memory is associated with non-hippocampal brain regions. This special issue of <i>Cognitive Neuroscience</i> focuses on whether the hippocampus is associated with implicit memory. An empirical fMRI paper by Miller, Kennard, Gowland, Antoniades, and Rosenthal (this issue) evaluated recognition memory performance of autobiographical amnesia patients with bilateral damage to hippocampal sub-region CA3 and found they had greater than chance recognition memory performance for spatial sequence learning, spatial item learning-same location, and non-spatial item learning, but chance performance for non-spatial sequence learning and spatial item learning-different location. These results are at odds with the view that the hippocampus is generally involved in sequence learning and complex event recognition. A discussion paper by Steinkrauss and Slotnick (this issue) considered whether fMRI studies have provided evidence that the hippocampus is associated with implicit memory. It was argued that all previous studies have been confounded by explicit memory, attentional states, stimuli, or novelty. This discussion paper is followed by commentaries from Hannula (this issue), Henke and Ruch (this issue), Rosenthal (this issue), Spaak (this issue), Thakral et al. (this issue), and Züst (this issue). The articles in this special issue illustrate that the association between the hippocampus and implicit memory is under active investigation and debate. It is hoped that the evidence and discourse in this issue will provide directions for future research.</p>","PeriodicalId":10413,"journal":{"name":"Cognitive Neuroscience","volume":" ","pages":"25-26"},"PeriodicalIF":2.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141064915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cognitive NeurosciencePub Date : 2024-01-01Epub Date: 2024-02-16DOI: 10.1080/17588928.2024.2315814
Phot Dhammapeera, Chloe Brunskill, Robin Hellerstedt, Zara M Bergström
{"title":"Counterfactual imagination impairs memory for true actions: EEG and behavioural evidence.","authors":"Phot Dhammapeera, Chloe Brunskill, Robin Hellerstedt, Zara M Bergström","doi":"10.1080/17588928.2024.2315814","DOIUrl":"10.1080/17588928.2024.2315814","url":null,"abstract":"<p><p>Imagined events can be misremembered as experienced, leading to memory distortions. However, less is known regarding how imagining counterfactual versions of past events can impair existing memories. We addressed this issue, and used EEG to investigate the neurocognitive processes involved when retrieving memories of true events that are associated with a competing imagined event. Participants first performed simple actions with everyday objects (e.g., rolling dice). A week later, they were shown pictures of some of the objects and either imagined the same action they had originally performed, or imagined a counterfactual action (e.g., stacking the dice). Subsequent tests showed that memory for performed actions was reduced after counterfactual imagination when compared to both veridical imagination and a baseline condition that had not been imagined at all, providing novel evidence that counterfactual imagination impairs true memories beyond simple forgetting over time. ERPs and EEG oscillations showed evidence of separate processes associated with memory retrieval versus post-retrieval processes that were recruited to support recall of memories that were challenging to access. The findings show that counterfactual imagination can cause impairments to sensorimotor-rich event memories, and provide new evidence regarding the neurocognitive mechanisms that are recruited when people need to distinguish memories of imagined versus true events.</p>","PeriodicalId":10413,"journal":{"name":"Cognitive Neuroscience","volume":" ","pages":"12-23"},"PeriodicalIF":2.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139740586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}