By George A. Gescheider
Information-Processing Channels within the Tactile Sensory approach addresses the elemental query of no matter if sensory channels, just like these identified to function in imaginative and prescient and audition, additionally function within the experience of contact. in response to the result of psychophysical and neurophysiological experimentation the authors make a robust case that channels function within the processing of mechanical stimulation of the hugely delicate glabrous dermis of the hand. in accordance with the multichannel version provided during this monograph, each one channel, with its particular form of mechanoreceptor and afferent nerve fiber, responds optiimally to specific facets of the tactile stimulus. it truly is extra proposed that the tactile conception of items effects from the mixed job of the person tactile channels. This paintings is necessary since it offers researchers and scholars within the box of sensory neuroscience with a entire version that boosts our realizing of tactile perception.
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Extra info for Information-Processing Channels in the Tactile Sensory System: A Psychophysical and Physiological Analysis
7â•… Threshold shift in dB relative to the unadapted threshold resulting from exposure to a 10-Hz adapting stimulus plotted as a function of the intensity of the adapting stimulus (A). Threshold displacement as a function of stimulus frequency compared with the frequency-selectivity functions of the PC and RA channels (B). From Verrillo and Gescheider (1977). 7A, it is at this intensity level that the adapting stimulus begins to elevate the threshold of the PC-mediated threshold for detecting a 120-Hz stimulus.
1988), however, in extending the frequency range to much lower frequencies than used by Verrillo, demonstrate that the threshold-frequency function is more complex than originally obtained by Verrillo. In Verrillo’s results, thresholds at frequencies between 25 Hz and 500 Hz were found to be high and nearly independent of stimulus frequency when stimuli were delivered through a small contactor. 5 Hz the threshold becomes essentially independent of stimulus frequency. Thresholds measured with the large contactor are nearly identical to those measured with the small contactor when stimulus frequency is below 40 Hz.
1978; Verrillo & Gescheider, 1977) and permit precise experimental determination of the frequency selectivity of each of the four channels. , 1978). In this method, a test stimulus of fixed frequency that selectively activates a single channel is presented at a clearly detectable level well above the detection threshold. Masking stimuli of varied frequency are then presented, and the intensity of each masking stimulus needed to render the test stimulus barely detectable is recorded. The psychophysical tuning curve is a graphic representation of these masking-stimulus intensities plotted as a function of their frequency and provides a measure of the frequency selectivity of the channel.
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