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Related Experiment Video

Updated: May 20, 2026

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
07:08

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

Published on: August 1, 2018

Visual discrimination in an orangutan (Pongo pygmaeus): measuring visual preference.

Yuki Hanazuka1, Hidetoshi Kurotori, Mika Shimizu

  • 1Department of Psychology, Graduate School of Letters, Chuo University, Tokyo, Japan. yuki.hanazuka@gmail.com

Perceptual and Motor Skills
|July 5, 2012
PubMed
Summary

This study investigated if orangutans can visually distinguish mammals from objects without prior training. Results indicate that orangutans show a preference for looking at mammals, suggesting innate visual discrimination abilities.

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Area of Science:

  • Primatology
  • Animal Cognition
  • Behavioral Ecology

Background:

  • Previous research established visual discrimination in trained orangutans.
  • The capacity for discrimination in untrained orangutans remained unexamined.

Observation:

  • An orangutan (Pongo pygmaeus) with no operant conditioning experience was observed.
  • Visual preference was measured by presenting photographs of mammals and inanimate objects.

Findings:

  • The orangutan spent more time viewing images of four-legged mammals compared to inanimate objects.
  • This suggests a natural ability to visually differentiate between these categories.

Implications:

  • Untrained orangutans may possess inherent visual discrimination skills.

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Last Updated: May 20, 2026

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  • This finding contributes to understanding cognitive abilities in non-human primates.