Individual-specific and shared representations during episodic memory encoding and retrieval
Although human memories seem unique to each individual, they are shared to a great extent across individuals. Previous studies have examined, separately, subject-specific and cross-subject shared representations during memory encoding and retrieval, but how shared memories are formed from individual...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2020-08-01
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| Series: | NeuroImage |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1053811920303955 |
| _version_ | 1819100096298483712 |
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| author | Xiaoqian Xiao Yu Zhou Jing Liu Zhifang Ye Li Yao Jiacai Zhang Chuansheng Chen Gui Xue |
| author_facet | Xiaoqian Xiao Yu Zhou Jing Liu Zhifang Ye Li Yao Jiacai Zhang Chuansheng Chen Gui Xue |
| author_sort | Xiaoqian Xiao |
| collection | DOAJ |
| description | Although human memories seem unique to each individual, they are shared to a great extent across individuals. Previous studies have examined, separately, subject-specific and cross-subject shared representations during memory encoding and retrieval, but how shared memories are formed from individually encoded representations is not clearly understood. Using a unique fMRI design involving memory encoding and retrieval, and representational similarity analysis to link representations from different individuals, brain regions, and processing stages, the current study revealed that distributed brain regions showed both subject-specific and shared neural representations during both memory encoding and retrieval. Furthermore, different brain regions showed stage-specific representational strength, with the visual cortex showing greater unique and shared representations during encoding, whereas the left angular gyrus showing greater unique and shared representations during retrieval. The neural representations during encoding were transformed during retrieval, as shown by smaller cross-subject encoding-retrieval similarity (ERS) than cross-subject similarity either during encoding or during retrieval. This cross-subject and cross-stage similarity was found both within and across regions, with strong pattern similarity between the encoded representation in VVC and the retrieved representation in the angular gyrus. Simulation analysis further suggested that these patterns could be achieved by incorporating stage-specific representational strength, and cross-region reinstatement from encoding to retrieval, but not by a common transformation from encoding to retrieval across subjects. Together, our results shed light on how memory representations are encoded and transformed to maintain individual characteristics and at the same time to create shared representations to facilitate interpersonal communication. |
| first_indexed | 2024-12-22T00:57:20Z |
| format | Article |
| id | doaj.art-4653b98b6e644d9ca236fbafc7556ded |
| institution | Directory Open Access Journal |
| issn | 1095-9572 |
| language | English |
| last_indexed | 2024-12-22T00:57:20Z |
| publishDate | 2020-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | NeuroImage |
| spelling | doaj.art-4653b98b6e644d9ca236fbafc7556ded2022-12-21T18:44:17ZengElsevierNeuroImage1095-95722020-08-01217116909Individual-specific and shared representations during episodic memory encoding and retrievalXiaoqian Xiao0Yu Zhou1Jing Liu2Zhifang Ye3Li Yao4Jiacai Zhang5Chuansheng Chen6Gui Xue7State Key Laboratory of Cognitive Neuroscience and Learning & IDG/McGovern Institute of Brain Research, Beijing Normal University, Beijing, 100875, PR China; School of Informatics, Beijing Normal University, Beijing, 100875, PR ChinaState Key Laboratory of Cognitive Neuroscience and Learning & IDG/McGovern Institute of Brain Research, Beijing Normal University, Beijing, 100875, PR ChinaState Key Laboratory of Cognitive Neuroscience and Learning & IDG/McGovern Institute of Brain Research, Beijing Normal University, Beijing, 100875, PR ChinaState Key Laboratory of Cognitive Neuroscience and Learning & IDG/McGovern Institute of Brain Research, Beijing Normal University, Beijing, 100875, PR ChinaSchool of Informatics, Beijing Normal University, Beijing, 100875, PR ChinaSchool of Informatics, Beijing Normal University, Beijing, 100875, PR ChinaDepartment of Psychological Science, University of California, Irvine, 92697, USAState Key Laboratory of Cognitive Neuroscience and Learning & IDG/McGovern Institute of Brain Research, Beijing Normal University, Beijing, 100875, PR China; Corresponding author.Although human memories seem unique to each individual, they are shared to a great extent across individuals. Previous studies have examined, separately, subject-specific and cross-subject shared representations during memory encoding and retrieval, but how shared memories are formed from individually encoded representations is not clearly understood. Using a unique fMRI design involving memory encoding and retrieval, and representational similarity analysis to link representations from different individuals, brain regions, and processing stages, the current study revealed that distributed brain regions showed both subject-specific and shared neural representations during both memory encoding and retrieval. Furthermore, different brain regions showed stage-specific representational strength, with the visual cortex showing greater unique and shared representations during encoding, whereas the left angular gyrus showing greater unique and shared representations during retrieval. The neural representations during encoding were transformed during retrieval, as shown by smaller cross-subject encoding-retrieval similarity (ERS) than cross-subject similarity either during encoding or during retrieval. This cross-subject and cross-stage similarity was found both within and across regions, with strong pattern similarity between the encoded representation in VVC and the retrieved representation in the angular gyrus. Simulation analysis further suggested that these patterns could be achieved by incorporating stage-specific representational strength, and cross-region reinstatement from encoding to retrieval, but not by a common transformation from encoding to retrieval across subjects. Together, our results shed light on how memory representations are encoded and transformed to maintain individual characteristics and at the same time to create shared representations to facilitate interpersonal communication.http://www.sciencedirect.com/science/article/pii/S1053811920303955 |
| spellingShingle | Xiaoqian Xiao Yu Zhou Jing Liu Zhifang Ye Li Yao Jiacai Zhang Chuansheng Chen Gui Xue Individual-specific and shared representations during episodic memory encoding and retrieval NeuroImage |
| title | Individual-specific and shared representations during episodic memory encoding and retrieval |
| title_full | Individual-specific and shared representations during episodic memory encoding and retrieval |
| title_fullStr | Individual-specific and shared representations during episodic memory encoding and retrieval |
| title_full_unstemmed | Individual-specific and shared representations during episodic memory encoding and retrieval |
| title_short | Individual-specific and shared representations during episodic memory encoding and retrieval |
| title_sort | individual specific and shared representations during episodic memory encoding and retrieval |
| url | http://www.sciencedirect.com/science/article/pii/S1053811920303955 |
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