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Related Experiment Videos

Size constancy in goldfish (Carassius auratus).

R H Douglas1, J Eva, N Guttridge

  • 1Department of Optometry and Visual Science, City University, London, U.K.

Behavioural Brain Research
|September 1, 1988
PubMed
Summary
This summary is machine-generated.

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Goldfish demonstrate size constancy, accurately judging object size regardless of distance. This means their perception isn't solely based on the visual angle subtended by the object.

Area of Science:

  • Animal behavior
  • Visual perception
  • Comparative psychology

Background:

  • Understanding how animals perceive object size is crucial for comprehending their interaction with the environment.
  • Previous research suggests visual cues like retinal image size play a significant role in size judgments.

Purpose of the Study:

  • To investigate whether fish (goldfish) exhibit size constancy.
  • To determine if fish can perceive an object's true size independent of its distance and the resulting visual angle.

Main Methods:

  • Goldfish were trained to differentiate between two targets of different actual sizes (5 cm and 10 cm) at equal distances.
  • Post-training, targets were presented at varying distances such that they subtended identical visual angles.
  • Choices were reinforced with food or social access.

Related Experiment Videos

Main Results:

  • Fish consistently chose the target they were trained to recognize, even when visual angles were manipulated to be equal.
  • This behavior indicates that goldfish can perceive object size irrespective of distance.

Conclusions:

  • Goldfish possess size constancy, a cognitive ability previously thought to be more complex.
  • This finding suggests a sophisticated level of visual processing in fish, comparable to some terrestrial vertebrates.