Development of Piagetian object permanence in a grey parrot (Psittacus erithacus).

  title={Development of Piagetian object permanence in a grey parrot (Psittacus erithacus).},
  author={Irene M. Pepperberg and Michaela Willner and Lauren Gravitz},
  journal={Journal of comparative psychology},
  volume={111 1},
The authors evaluated the ontogenetic performance of a grey parrot (Psittacus erithacus) on object permanence tasks designed for human infants. Testing began when the bird was 8 weeks old, prior to fledging and weaning. Because adult grey parrots understand complex invisible displacements (I. M. Pepperberg & F. A. Kozak, 1986), the authors continued weekly testing until the current subject completed all of I. C. Uzgiris and J. Hunt's (1975) Scale 1 tasks. Stage 6 object permanence with respect… CONTINUE READING
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