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Related Experiment Video

Updated: Apr 28, 2026

Non-aversive Animal Restraint Enabling Recording of Optomotor Reflex in Ground Squirrels

Non-aversive Animal Restraint Enabling Recording of Optomotor Reflex in Ground Squirrels

Published on: July 25, 2025

Visual acuity and spatial contrast sensitivity in tree squirrels.

G H Jacobs¹, D G Birch, B Blakeslee

¹Department of Psychology, University of California, Santa Barbara, CA 93106 U.S.A.

Behavioural Processes

|June 14, 2014

Summary

This summary is machine-generated.

Tree squirrels

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Published on: March 18, 2019

Area of Science:

Animal Vision
Sensory Ecology
Comparative Psychology

Background:

Squirrels' visual capabilities are crucial for arboreal navigation and predator detection.
Understanding spatial vision in tree squirrels provides insights into their ecological niche.

Purpose of the Study:

To quantify the spatial visual sensitivity and acuity of three tree squirrel species.
To investigate the effect of luminance on spatial resolution in squirrels.

Main Methods:

Behavioral discrimination experiments using sinusoidally-modulated and square-wave gratings.
Measurement of contrast sensitivity functions at different luminance levels (3.4 cd/m² and 340 cd/m²).

Main Results:

Squirrels showed peak sensitivity to spatial frequencies around 0.5 cycles/degree (c/d) at 3.4 cd/m².
The finest gratings discriminated by squirrels averaged 2.2 c/d.
Spatial acuity improved with increased luminance, reaching 3.9 c/d at 340 cd/m².
No significant differences in resolution acuity were found among the three species.

Conclusions:

Tree squirrels possess moderate spatial vision capabilities, with acuity dependent on light levels.
Luminance significantly influences spatial resolution in tree squirrels.
The visual systems of western gray, fox, and eastern gray squirrels are comparable in terms of spatial resolution.