Using the magnitude estimation and production methods, the psychophysical function for very, very short visual extents was shown to be a straight line. The argument is made that the linearity of the psychophysical function is independent of past experience. Such a linear relation to plausibly due to the linearity of the transformation, through perceptual constancy, of the physical extents into ...

The frequency-response characteristics of channels used in human vibrotaction were studied by using a psychophysical tuning-curve paradigm derived from auditory research. Sinusodial 200-msec vibratory bursts delivered to the thenar eminence of the hand were detected in the presence of sinusodial maskers delivered to the same skin area either continuously or pulsed in forward masking. Psychophys...