RT Journal Article
SR Electronic
T1 Single-exposure visual memory judgments are reflected in IT cortex
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 197764
DO 10.1101/197764
A1 Travis Meyer
A1 Nicole C. Rust
YR 2018
UL http://biorxiv.org/content/early/2018/02/13/197764.abstract
AB Our visual memory percepts of whether we have encountered specific objects or scenes before are hypothesized to manifest as decrements in neural responses in inferotemporal cortex (IT) with stimulus repetition. To evaluate this proposal, we recorded IT neural responses as two monkeys performed a single-exposure visual memory task designed to measure the rates of forgetting with time. We found that a weighted linear read-out of IT was a better predictor of the monkeys’ forgetting rates and reaction time patterns than a strict instantiation of the repetition suppression hypothesis, expressed as a total spike count scheme. Behavioral predictions could be attributed to visual memory signals that were reflected as repetition suppression and were intermingled with visual selectivity, but only when combined across the most sensitive neurons.