Size constancy in goldfish (Carassius auratus).

  title={Size constancy in goldfish (Carassius auratus).},
  author={Ronald H. Douglas and J K Eva and Nancy M. Guttridge},
  journal={Behavioural brain research},
  volume={30 1},
This study examines whether fish are able to judge the real size of objects taking distance into account, or if size judgements are based purely on the angle objects subtend on the retina. Goldfish were trained to discriminate between 2 targets which differed from one another only in their diameters (5 cm and 10 cm), presented initially equidistantly from the fish. A choice of the correct target was rewarded either by food or by access to other fish. Following successful training, the targets… CONTINUE READING
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