Percepção da ilusão de Müller-Lyer em macaco-prego (Cebus spp.) / Percepção da ilusão de Müller-Lyer em macaco-prego (Cebus spp.)

AUTOR(ES)

Elisa Suganuma

DATA DE PUBLICAÇÃO

2006

RESUMO

Visual illusions are formed by the differences between the perception of one figure and its real physical characteristics. The Müller-Lyer illusion is the best known and most studied geometric illusion that consists in the subjects judgment between two parallel lines with the same size, both associated with outwardpointing arrowheads or inward-pointing arrowheads, acting as inductors that make the lines to be perceived to have different sizes. Old World primates had been used to investigate illusory visual perception. This study aimed to investigate the Müller-Lyer illusion in capuchin monkeys (Cebus spp.), a New World primate not yet investigated for this illusion. A computer program was developed to permit the manipulation of parameters that affect the perception and allow the investigation of visual illusions. Ten adult subjects (5 females and 5 males) were used. Before the tests, they were trained to discriminate between two physically different lines with and without arrowheads. Regarding the Müller-Lyer test (ML) monkeys exhibited a susceptibility to the illusion. In order to determine the degree of the illusion, It was performed the Point of Subjective Equality test (PSE with arrowheads and PSE without arrowheads) which is based on the estimation of the point where the lines were considered equally long for stimuli with and without arrowheads. The results of the ML test have shown that all subjects chose preferentially the line with inward-pointing arrowheads in the Müller-Lyer test, irrespective of gender. The PSE without arrowheads value were inferior than PSE with arrowheads. Thus, it was demonstrated that capuchin monkeys were susceptible to the illusion once the perception of the lines size were influenced by the arrowheads direction.

ASSUNTO(S)

visual perception ilusão de müller-lyer müller-lyer illusion percepção visual macaco-prego ciencias da saude capuchin monkey

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