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Updated: Apr 18, 2026

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

Published on: August 1, 2018

Coding of relative size in monkey inferotemporal cortex.

T Vighneshvel¹, Sripati P Arun²

¹Centre for Neuroscience, Indian Institute of Science, Bangalore, India.

Journal of Neurophysiology

|January 16, 2015

Summary

This summary is machine-generated.

Neurons in the inferotemporal cortex (IT) can encode relative object size, not just absolute size. This finding offers a neural basis for size constancy, explaining how we perceive object size accurately.

Keywords:

neural coding object recognition perceptual constancy

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Area of Science:

Neuroscience
Visual Perception
Cognitive Science

Background:

The brain must overcome discrepancies between retinal image size and perceived object size for accurate visual perception.
Understanding the neural mechanisms of size constancy is crucial for comprehending visual processing.

Purpose of the Study:

To investigate whether neurons in the monkey inferotemporal cortex (IT) are sensitive to the relative size of visual parts.
To explore the neural basis of size constancy by examining responses to scaled visual stimuli.

Main Methods:

Electrophysiological recordings were performed on single neurons in the inferotemporal cortex (IT) of monkeys.
Neurons were presented with shapes composed of two parts, each at two possible sizes, creating four stimulus versions.
Neuronal responses were analyzed to differentiate between sensitivity to absolute versus relative size.

Main Results:

IT neurons showed similar response patterns across different scaled versions of shapes.
A subpopulation of IT neurons exhibited response interactions indicating sensitivity to proportionately scaled parts.
This relative size sensitivity developed concurrently with absolute size sensitivity for conjoined parts and slightly later for separated parts.

Conclusions:

A subpopulation of neurons in the inferotemporal cortex (IT) encodes the relative size of visual parts.
These findings provide the first evidence for a neural substrate in IT supporting relative size encoding and size constancy.