Neuroscience 2001 Abstract
| Presentation Number: | 849.7 |
|---|---|
| Abstract Title: | FUNCTIONAL MRI INVESTIGATIONS OF CROSS-FORM ENCODING. |
| Authors: |
Walter, E. L.*1
; Tindell, A. J.4
; Wessinger, C. M.2,3,5
1Cognitive Science, Dartmouth College and Medical School, Hanover, NH 2Psychological and Brain Sciences, Dartmouth College and Medical School, Hanover, NH 3Section in Neurology, Dartmouth College and Medical School, Hanover, NH 4Psychology, University of Michigan, Ann Arbor, MI 5Psychology, Gettysburg College, Gettysburg, PA |
| Primary Theme and Topics |
Cognition and Behavior - Human Cognition and Behavior -- Other higher functions |
| Secondary Theme and Topics | Cognition and Behavior<br />- Human Cognition and Behavior<br />-- Learning and memory |
| Session: |
849. Human cognition and behavior: other higher functions IV Poster |
| Presentation Time: | Wednesday, November 14, 2001 3:00 PM-4:00 PM |
| Location: | Exhibit Hall SS-62 |
| Keywords: | counsciousness, memory, priming |
Using a cross-form priming paradigm we have previously shown the extraction of semantic information from pictures, both with and without awareness. We manipulated awareness by using extended presentations (5 sec), as well as brief (approx 50 msec), masked presentations designed to halt conscious processing. Subsequent recognition judgments revealed that information was extracted both with and without awareness. We have now adapted this cross-form paradigm for fMRI. Using the same briefly-presented, masked pictures we demonstrated activation associated with the extraction and encoding of semantic information. Further, by comparing block and event-related designs, we show activation differences for successful and unsuccessful encoding. Results are generally consistent with previous fMRI investigations of encoding. That is, we demonstrate activation in ventral visual cortex, medial frontal cortex, and hippocampal regions. However, key differences also are evident. For example, we did not observe primary visual cortex or medial temporal lobe activation. Further, not all regions are activated in all conditions. Hippocampal activation was not observed with the block design. With the event-related design, activation in the ventral visual cortex was greater for successful than for unsuccessful encoding. Perhaps such differences in encoding success or failure ultimately affect conscious and unconscious processing.
Supported by Program Project Grant # 2 P50 NS17778-19 from NINDS
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2001 Neuroscience Meeting Planner. San Diego, CA: Society for Neuroscience, 2001. Online.
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