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Journal of Neuroscience, Vol 12, 3414-3426, Copyright © 1992 by Society for Neuroscience
Neural coding of tactile texture: comparison of spatial and temporal mechanisms for roughness perception
CE Connor and KO Johnson
Phillip Bard Laboratories of Neurophysiology, Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205.
A previous study showed that roughness perception may depend on either
temporal or spatial variations in firing rate among cutaneous
mechanoreceptive afferents. The present study was designed to distinguish
between these hypotheses. Plastic surfaces embossed with patterns of dots
designed to produce predictable alterations in temporal and spatial firing
rate variation were used as stimuli in psychophysical and
neurophysiological experiments. Subjective roughness magnitudes obtained
from psychophysical experiments fitted the predictions of the spatial but
not the temporal hypothesis. In the neurophysiological experiments, the
stimuli were scanned across the receptive fields of cutaneous
mechanoreceptive afferents. Firing rate variation in the neural responses
was measured using a range of temporal and spatial filters. Temporal
variation was not correlated with roughness magnitude. Spatial variation,
on a scale of 1-2 mm (one to two receptor spacings), was closely correlated
with roughness.
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