Adaptation decorrelates shape representations

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Mattar , M G , Olkkonen , M , Epstein , R A & Aguirre , G K 2018 , ' Adaptation decorrelates shape representations ' , Nature Communications , vol. 9 , 3812 . https://doi.org/10.1038/s41467-018-06278-y

Title: Adaptation decorrelates shape representations
Author: Mattar, Marcelo G.; Olkkonen, Maria; Epstein, Russell A.; Aguirre, Geoffrey K.
Contributor: University of Helsinki, Department of Psychology and Logopedics
Date: 2018-09-19
Language: eng
Number of pages: 9
Belongs to series: Nature Communications
ISSN: 2041-1723
URI: http://hdl.handle.net/10138/299394
Abstract: Perception and neural responses are modulated by sensory history. Visual adaptation, an example of such an effect, has been hypothesized to improve stimulus discrimination by decorrelating responses across a set of neural units. While a central theoretical model, behavioral and neural evidence for this theory is limited and inconclusive. Here, we use a parametric 3D shape-space to test whether adaptation decorrelates shape representations in humans. In a behavioral experiment with 20 subjects, we find that adaptation to a shape class improves discrimination of subsequently presented stimuli with similar features. In a BOLD fMRI experiment with 10 subjects, we observe that adaptation to a shape class decorrelates the multivariate representations of subsequently presented stimuli with similar features in object-selective cortex. These results support the long-standing proposal that adaptation improves perceptual discrimination and decorrelates neural representations, offering insights into potential underlying mechanisms.
Subject: PRIMARY VISUAL-CORTEX
NEURAL ADAPTATION
FUSIFORM CORTEX
DISCRIMINATION
BRAIN
INFORMATION
REPETITION
ROBUST
REGISTRATION
TIMESCALES
515 Psychology
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