期刊
CEREBRAL CORTEX
卷 16, 期 8, 页码 1126-1133出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/cercor/bhj054
关键词
fMRI; memory distortion; self-referential processing; visual processing
资金
- NCRR NIH HHS [P41RR14075] Funding Source: Medline
- NIMH NIH HHS [MH070199, MH60941] Funding Source: Medline
A relatively common form of memory distortion arises when individuals must discriminate items they have seen from those they have imagined (reality monitoring). The present fMRI investigation (at 1.5 T) focused on the processes that relate to memory assignment regardless of accuracy (e.g. that correspond with the belief that an item was presented as a picture, regardless of whether that belief is correct). Prior to the scan, participants (n = 16) viewed concrete nouns and formed mental images of the object named. Half of the names were followed by the object's photo. During the scan, participants saw the object names and indicated whether the corresponding photo had been studied. Activity in visual-processing regions (including the precuneus and fusiform gyrus) corresponded with the attribution of an item to a pictorial presentation. In contrast, activity in regions thought to be important for self-referential processing (including the ventromedial prefrontal cortex and posterior cingulate gyrus) was associated with attribution to a nonpresented source. These neural findings converge with behavioral evidence indicating that individuals use the amount of different types of information retrieved (e.g. perceptual detail, information about cognitive operations) to determine whether an item was imagined or perceived.
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