Rethinking simultaneous suppression in visual cortex via compressive spatiotemporal population receptive fields.

ABSTRACT: When multiple visual stimuli are presented simultaneously in the receptive field, the neural response is suppressed compared to presenting the same stimuli sequentially. The prevailing hypothesis suggests that this suppression is due to competition among multiple stimuli for limited resources within receptive fields, governed by task demands. However, it is unknown how stimulus-driven computations may give rise to simultaneous suppression. Using fMRI, we find simultaneous suppression in single voxels, which varies with both stimulus size and timing, and progressively increases up the visual hierarchy. Using population receptive field (pRF) models, we find that compressive spatiotemporal summation rather than compressive spatial summation predicts simultaneous suppression, and that increase

SUBMITTER: Kupers ER 

PROVIDER: S-EPMC11317513 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature