VISUAL AND HAPTIC PERCPETION OF LINE LENGHT, AREA AND VOLUME BY SIGHTED AND BLIND OBSERVERS
Keywords:
Visual perception, Haptic perception, Psychophysics, Stevens law, Sensory transducersAbstract
Separated groups of observers made, using visual or
haptic perception, numerical magnitude estimates of line lenghts, irregular
areas and volume of cubes. Three experimental groups were used: Visual
(sighted), Induced Touch (Mndfolded, sighted observers) and Natural
Touch (blind observers). Power functions parameters were calculated for
each observer in each experimental group. The results showed that there
is a significant difference between the judgments of lenght, area and
volume when these are visually estimated. Thus, for visual estimates
there is a systematic decrease of the exponents as a function of
increasing the spatial dimensions (one-,two-, and three-dimensional) of
the stimuli to be estimated. This pattern of results suggests that for visual
estimates there seems to be three different perceptual transducer
channels: one for lenght, one for area, and another for volume. For the
haptic estimates the data showed that there is a nonsignificant difference
between the one-dimensional and two-dimensional estimates, but both are
different from the three-dimensional estimates. This pattern of results
suggests that for haptic estimates probably there are two different
perceptual transducer channels: one for one-dimensional and
two-dimensional stimuli, and another for three-dimensional stimuli.
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