Abstract

Recent work has identified a Parietal Memory Network (PMN), which exhibits regular patterns of activation during memory encoding and retrieval. Among these characteristic patterns, this network displays a strong “retrieval success” effect, showing greater activation for correctlyremembered studied items (hits) compared to correctly-rejected novel items (CRs). To date, most relevant studies have used short retention intervals. Here, we ask if the retrieval success effect seen in the PMN would remain consistent over a delay. Twenty participants underwent fMRI while encoding and recognizing scenes. Greater activity for hits than for correctly-rejected lures within PMN regions was observed after a short delay (~10 min), replicating prior reports. However, after a long retention interval (~48 hours), the network showed an attenuated (but still present) retrieval success effect, with the disparity driven primarily by attenuated activation for hits (i.e., correctly-rejected lures exhibited little to no activity at both delays). Importantly, this difference cannot be entirely explained by a decrease in participant confidence after the delay. These findings suggest a degree of temporal constraint on experiences with stimuli that elicit activation in the PMN.

Committee Chair

Kathleen McDermott

Committee Members

Ian Dobbins, Steve Petersen

Comments

Permanent URL: https://doi.org/10.7936/K7GT5MM8

Degree

Master of Arts (AM/MA)

Author's Department

Psychology

Author's School

Graduate School of Arts and Sciences

Document Type

Thesis

Date of Award

Fall 12-2017

Language

English (en)

Author's ORCID

https://orcid.org/0000-0002-5781-0042

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Psychology Commons

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