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Related Experiment Video

Updated: Jul 17, 2026

Long-term Behavioral Tracking of Freely Swimming Weakly Electric Fish

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Published on: March 6, 2014

Dolphin (Tursiops truncatus) echoic angular discrimination: effects of object separation and complexity.

Brian K Branstetter¹, Sonja J Mevissen, Adam A Pack

¹Psychology Department, University of Hawaii, Manoa, Honolulu, Hawaii 96822-2294, USA. branstet@hawaii.edu

The Journal of the Acoustical Society of America

|February 15, 2007

Summary

Dolphins can discern spatial differences using echolocation. Increasing space between sonar targets improves their ability to distinguish locations, demonstrating advanced spatial resolution.

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Area of Science:

Marine Biology
Bioacoustics
Animal Behavior

Background:

Dolphins utilize echolocation for navigation and foraging in complex underwater environments.
Understanding the spatial acuity of dolphin sonar is crucial for comprehending their sensory capabilities.

Purpose of the Study:

To investigate the bottlenose dolphin's ability to discriminate angular differences using echolocation.
To determine how target configuration (number and spacing) affects spatial discrimination thresholds.

Main Methods:

A blindfolded bottlenose dolphin was trained to discriminate between an array of two rods (S+) and a single rod (S-) using echolocation.
The dolphin performed the task from a fixed distance, with varying angular separations between stimuli.
Two experiments were conducted, varying the angular separation between rods within the S+ array (thetaw).

Main Results:

The dolphin achieved 75% correct thresholds of 1.5 degrees when thetaw was 2 degrees.
The dolphin achieved 75% correct thresholds of 0.7 degrees when thetaw was 4 degrees.
Localization accuracy improved with increased spacing between rods in the stimulus array.

Conclusions:

Dolphins' ability to resolve spatial information via echolocation is highly developed.
Reducing the number of targets does not enhance, but rather may hinder, localization accuracy.
Increased spatial separation between sonar targets significantly improves angular discrimination.