Repetition suppression and multi-voxel pattern similarity differentially track implicit and explicit visual memory

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
Emily J WardBrice A Kuhl

Abstract

Repeated exposure to a visual stimulus is associated with corresponding reductions in neural activity, particularly within visual cortical areas. It has been argued that this phenomenon of repetition suppression is related to increases in processing fluency or implicit memory. However, repetition of a visual stimulus can also be considered in terms of the similarity of the pattern of neural activity elicited at each exposure--a measure that has recently been linked to explicit memory. Despite the popularity of each of these measures, direct comparisons between the two have been limited, and the extent to which they differentially (or similarly) relate to behavioral measures of memory has not been clearly established. In the present study, we compared repetition suppression and pattern similarity as predictors of both implicit and explicit memory. Using functional magnetic resonance imaging, we scanned 20 participants while they viewed and categorized repeated presentations of scenes. Repetition priming (facilitated categorization across repetitions) was used as a measure of implicit memory, and subsequent scene recognition was used as a measure of explicit memory. We found that repetition priming was predicted by repetition sup...Continue Reading

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Related Concepts

Optic Tract Structure
Dioxygen
Pattern Recognition, Visual
Reaction Time
Optical Image Reconstruction
Repetition Priming
Visual Suppression
Structure of Cortex of Kidney
Familiarity
FMRI

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