The human memory system interacts with an ever-changing perceptual environment, and the perceptual properties of new information can shape that informationâs mnemonic fate. Experimentally, shifts in perception to a salient stimulus have been shown to enhance memorability of post-shift items (Murdock and Walker, 1969). Despite this work, the neural signals that reflect this enhanced memorability at perceptual boundaries remain to be characterized. Sederberg et al. (2006) described global shifts in the oscillatory topography elicited by studied items at early vs. late serial positions, and showed distinct subsequent memory responses for items of each type. In a scalp EEG experiment, we expanded on these findings by manipulating the presentation modality (auditory vs. visual) of studied material to elicit a mid-list perceptual shift that enhances the memorability of the post-shift item. These post-shift items elicited an oscillatory response which showed enhanced delta activity (2-4 Hz) and diminished alpha activity (10-14 Hz) relative to non-shift items from the same modality. We contrast these effects with the list position effects described by Sederberg et al. (2006), with an aim to further inform our understanding of the processes underlying the effects of contextual shifts on episodic memory.
| Identifer | oai:union.ndltd.org:VANDERBILT/oai:VANDERBILTETD:etd-07152016-154205 |
| Date | 18 July 2016 |
| Creators | McCluey, Joshua Daniel |
| Contributors | Sean M. Polyn, Ph.D., Geoffrey F. Woodman, Ph.D. |
| Publisher | VANDERBILT |
| Source Sets | Vanderbilt University Theses |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.library.vanderbilt.edu/available/etd-07152016-154205/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Vanderbilt University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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