VISUAL AND HAPTIC PERCPETION OF LINE LENGHT, AREA AND VOLUME BY SIGHTED AND BLIND OBSERVERS

• Autor(a) principal: Mestriner Zedu, Paula
• Data de Publicação: 2012
• Outros Autores: Yano, Angela Maria, Faleiros Sousa, Fátima, Aparecido da Silva, José
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Psicologia (Universidade de Brasília. Online)
• Texto Completo: https://periodicos.unb.br/index.php/revistaptp/article/view/17137
• topic: Percepção visual; Percepção tatual-cinestésica; Psicofísica; Lei de Stevens; Canais visuais; Visual perception; Haptic perception; Psychophysics; Stevens law; Sensory transducers

Separated groups of observers made, using visual orhaptic perception, numerical magnitude estimates of line lenghts, irregularareas and volume of cubes. Three experimental groups were used: Visual(sighted), Induced Touch (Mndfolded, sighted observers) and NaturalTouch (blind observers). Power functions parameters were calculated foreach observer in each experimental group. The results showed that thereis a significant difference between the judgments of lenght, area andvolume when these are visually estimated. Thus, for visual estimatesthere is a systematic decrease of the exponents as a function ofincreasing the spatial dimensions (one-,two-, and three-dimensional) ofthe stimuli to be estimated. This pattern of results suggests that for visualestimates there seems to be three different perceptual transducerchannels: one for lenght, one for area, and another for volume. For thehaptic estimates the data showed that there is a nonsignificant differencebetween the one-dimensional and two-dimensional estimates, but both aredifferent from the three-dimensional estimates. This pattern of resultssuggests that for haptic estimates probably there are two differentperceptual transducer channels: one for one-dimensional andtwo-dimensional stimuli, and another for three-dimensional stimuli.