Autobiographical Memory Retrieval and Hippocampal Activation as a Function of Repetition and the Passage of Time
Multiple trace theory (MTT) predicts that hippocampal memory traces expand and strengthen as a function of repeated memory retrievals. We tested this hypothesis utilizing fMRI, comparing the effect of memory retrieval versus the mere passage of time on hippocampal activation. While undergoing fMRI s...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2007-01-01
|
| Series: | Neural Plasticity |
| Online Access: | http://dx.doi.org/10.1155/2007/90472 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832563342742388736 |
|---|---|
| author | Lynn Nadel Jenna Campbell Lee Ryan |
| author_facet | Lynn Nadel Jenna Campbell Lee Ryan |
| author_sort | Lynn Nadel |
| collection | DOAJ |
| description | Multiple trace theory (MTT) predicts that hippocampal memory traces expand and strengthen as a function of repeated memory retrievals. We tested this hypothesis utilizing fMRI, comparing the effect of memory retrieval versus the mere passage of time on hippocampal activation. While undergoing fMRI scanning, participants retrieved remote autobiographical memories that had been previously retrieved either one month earlier, two days earlier, or multiple times during the preceding month. Behavioral analyses revealed that the number and consistency of memory details retrieved increased with multiple retrievals but not with the passage of time. While all three retrieval conditions activated a similar set of brain regions normally associated with autobiographical memory retrieval including medial temporal lobe structures, hippocampal activation did not change as a function of either multiple retrievals or the passage of time. However, activation in other brain regions, including the precuneus, lateral prefrontal cortex, parietal cortex, lateral temporal lobe, and perirhinal cortex increased after multiple retrievals, but was not influenced by the passage of time. These results have important implications for existing theories of long-term memory consolidation. |
| format | Article |
| id | doaj-art-2319dad4530e42149f1c3cfe02f80f4c |
| institution | Kabale University |
| issn | 2090-5904 1687-5443 |
| language | English |
| publishDate | 2007-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Neural Plasticity |
| spelling | doaj-art-2319dad4530e42149f1c3cfe02f80f4c2025-02-03T01:20:23ZengWileyNeural Plasticity2090-59041687-54432007-01-01200710.1155/2007/9047290472Autobiographical Memory Retrieval and Hippocampal Activation as a Function of Repetition and the Passage of TimeLynn Nadel0Jenna Campbell1Lee Ryan2Department of Psychology, University of Arizona, Tucson, AZ 85721, USADepartment of Psychology, University of Arizona, Tucson, AZ 85721, USADepartment of Psychology, University of Arizona, Tucson, AZ 85721, USAMultiple trace theory (MTT) predicts that hippocampal memory traces expand and strengthen as a function of repeated memory retrievals. We tested this hypothesis utilizing fMRI, comparing the effect of memory retrieval versus the mere passage of time on hippocampal activation. While undergoing fMRI scanning, participants retrieved remote autobiographical memories that had been previously retrieved either one month earlier, two days earlier, or multiple times during the preceding month. Behavioral analyses revealed that the number and consistency of memory details retrieved increased with multiple retrievals but not with the passage of time. While all three retrieval conditions activated a similar set of brain regions normally associated with autobiographical memory retrieval including medial temporal lobe structures, hippocampal activation did not change as a function of either multiple retrievals or the passage of time. However, activation in other brain regions, including the precuneus, lateral prefrontal cortex, parietal cortex, lateral temporal lobe, and perirhinal cortex increased after multiple retrievals, but was not influenced by the passage of time. These results have important implications for existing theories of long-term memory consolidation.http://dx.doi.org/10.1155/2007/90472 |
| spellingShingle | Lynn Nadel Jenna Campbell Lee Ryan Autobiographical Memory Retrieval and Hippocampal Activation as a Function of Repetition and the Passage of Time Neural Plasticity |
| title | Autobiographical Memory Retrieval and Hippocampal Activation as a Function of Repetition and the Passage of Time |
| title_full | Autobiographical Memory Retrieval and Hippocampal Activation as a Function of Repetition and the Passage of Time |
| title_fullStr | Autobiographical Memory Retrieval and Hippocampal Activation as a Function of Repetition and the Passage of Time |
| title_full_unstemmed | Autobiographical Memory Retrieval and Hippocampal Activation as a Function of Repetition and the Passage of Time |
| title_short | Autobiographical Memory Retrieval and Hippocampal Activation as a Function of Repetition and the Passage of Time |
| title_sort | autobiographical memory retrieval and hippocampal activation as a function of repetition and the passage of time |
| url | http://dx.doi.org/10.1155/2007/90472 |
| work_keys_str_mv | AT lynnnadel autobiographicalmemoryretrievalandhippocampalactivationasafunctionofrepetitionandthepassageoftime AT jennacampbell autobiographicalmemoryretrievalandhippocampalactivationasafunctionofrepetitionandthepassageoftime AT leeryan autobiographicalmemoryretrievalandhippocampalactivationasafunctionofrepetitionandthepassageoftime |