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Related Experiment Video

Updated: Jun 13, 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

Global visual processing in macaques studied using Kanizsa illusory shapes.

Kimberly A Feltner¹, Lynne Kiorpes

¹Center for Neural Science, New York University, New York, New York 10003, USA. kf42@nyu.edu

Visual Neuroscience

|May 1, 2010

Summary

This summary is machine-generated.

Macaque monkeys demonstrate global form processing by perceiving illusory shapes, similar to humans. This study shows their visual systems can "fill-in" contour gaps for shape recognition.

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Related Experiment Videos

Last Updated: Jun 13, 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

Investigating the Effect of Visual Imagery and Learning Shape-Audio Regularities on Bouba and Kiki

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Published on: September 13, 2019

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns

Published on: May 12, 2019

Area of Science:

Neuroscience
Vision Science
Primate Behavior

Background:

Global form processing is crucial for visual perception, including object recognition and figure-ground segregation.
While neural mechanisms in primates are studied, behavioral evidence for global form processing is limited.

Purpose of the Study:

To investigate global visual processing in macaque monkeys using Kanizsa illusory shapes.
To behaviorally demonstrate the capacity for global form perception in macaques.

Main Methods:

Three macaque monkeys (Macaca nemestrina) were trained on a similarity match-to-sample task.
Task involved discriminating complete forms and then Kanizsa illusory shapes within element fields.
Performance was assessed by varying support ratio and discriminating illusory square thickness.

Main Results:

Two of three macaques achieved over 80% correct performance on four of five illusory shape conditions.
The third macaque mastered three of five conditions, indicating clear illusory form perception.
Performance limits were established by manipulating task parameters.

Conclusions:

Macaque monkeys exhibit global form processing capabilities comparable to humans.
The perceptual mechanisms for completing contours, as seen in humans, are present in macaques.