Related Experiment Video
Updated: Jun 6, 2026
10:56
Long-term Behavioral Tracking of Freely Swimming Weakly Electric Fish
Published on: March 6, 2014
Visual laterality in dolphins when looking at (un)familiar humans.
Hélène Thieltges1, Alban Lemasson, Stan Kuczaj
1UMR 6552 University of Rennes-CNRS, Station Biologique, 35380, Paimpont, France.
Animal Cognition
|December 9, 2010
Summary
Bottlenose dolphins show a left-eye preference when viewing humans. Their visual response indicates they can distinguish between familiar and unfamiliar people, but this doesn't alter eye preference.
Area of Science:
- Neuroscience
- Animal Behavior
- Marine Biology
Background:
- Brain lateralisation, particularly visual laterality, is crucial for understanding human evolution.
- Limited research exists on visual laterality in marine mammals, hindering comparative studies.
Purpose of the Study:
- To investigate visual laterality in bottlenose dolphins (Tursiops truncatus).
- To determine if human familiarity influences dolphin visual responses and eye preference.
Main Methods:
- Observing the visual responses of five captive bottlenose dolphins to familiar and unfamiliar humans.
- Analyzing gaze duration and eye usage in response to different human stimuli.
Main Results:
- Dolphins exhibited longer gazes toward unfamiliar humans compared to familiar ones, demonstrating stimulus discrimination.
- All dolphins consistently showed a preferential use of their left eye across all visual stimuli.
- Human familiarity did not significantly affect the dolphins' preferred eye for viewing.
Conclusions:
- Bottlenose dolphins possess visual discrimination abilities regarding human familiarity.
- A consistent left-eye preference in visual attention was observed in this dolphin population.
- These findings contribute to the comparative understanding of brain lateralisation in vertebrates.
