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

Pepperberg, Irene M.; Willner, Mark R.; Gravitz, Lauren B.

doi:10.1037//0735-7036.111.1.63

Journal of Comparative Psychology

1997

DOI: 10.1037//0735-7036.111.1.63

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

Irene M. Pepperberg¹,

Mark R. Willner²,

Lauren B. Gravitz³

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

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