Modeling diverse responses to filled and outline shapes in macaque V4

Journal of Neurophysiology
Dina V PopovkinaAnitha Pasupathy

Abstract

Visual area V4 is an important midlevel cortical processing stage that subserves object recognition in primates. Studies investigating shape coding in V4 have largely probed neuronal responses with filled shapes, i.e., shapes defined by both a boundary and an interior fill. As a result, we do not know whether form-selective V4 responses are dictated by boundary features alone or if interior fill is also important. We studied 43 V4 neurons in two male macaque monkeys ( Macaca mulatta) with a set of 362 filled shapes and their corresponding outlines to determine how interior fill modulates neuronal responses in shape-selective neurons. Only a minority of neurons exhibited similar response strength and shape preferences for filled and outline stimuli. A majority responded preferentially to one stimulus category (either filled or outline shapes) and poorly to the other. Our findings are inconsistent with predictions of the hierarchical-max (HMax) V4 model that builds form selectivity from oriented boundary features and takes little account of attributes related to object surface, such as the phase of the boundary edge. We modified the V4 HMax model to include sensitivity to interior fill by either removing phase-pooling or introduc...Continue Reading

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Citations

Jan 16, 2020·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Derek M MillerBill J Yates
Jun 26, 2020·Annual Review of Vision Science·Anitha PasupathyTaekjun Kim

Related Concepts

Metazoa
Macaca mulatta
Neurons
Visual Cortex
Visual Perception
Body Regions
Cerebral Cortex
Macaca mulatta
Neurons
Psychological Orientation

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