Peculiarities of Recognition and Comparison by Size of Two-Dimensional Images and Three-Dimensional Objects of Different Colors in the Lower Monkeys

摘要

The ability of monkeys to recognize and compare two-dimensional images and three-dimensional objects of different colors by size was studied.The study was carried out on two species of monkey of different level of phylogenetic development:rhesus macaques(Macaca mulatto)and brown capuchin(Cebus apella).The monkeys were established to be able to recognize and to compare by size the two-dimensional pictures and three-dimensional objects of red,yellow,and green colors with identification of the relative sign "more." Solution of visual tasks of the "more-less" type was achieved at any combination of stimuli regardless of color.The age-and specie-related differences were revealed during the course of training.In all monkeys the "transfer of learning" and formation of generalization were traced.This indicates a sufficiently well developed level of elementary thinking in the lower monkeys.