Author:
ALLISON JOHN D.,SMITH KEVIN R.,BONDS A.B.
Abstract
A sinusoidal mask grating oriented orthogonally to
and superimposed onto an optimally oriented base grating
reduces a cortical neuron's response amplitude. The spatial
selectivity of cross-orientation suppression (XOR) has been
described, so for this paper we investigated the temporal
properties of XOR. We recorded from single striate cortical
neurons (n = 72) in anesthetized and paralyzed cats.
After quantifying the spatial and temporal characteristics of
each cell's excitatory response to a base grating, we measured
the temporal-frequency tuning of XOR by systematically varying
the temporal frequency of a mask grating placed at a null
orientation outside of the cell's excitatory orientation
domain. The average preferred temporal frequency of the excitatory
response of the neurons in our sample was 3.8 (± 1.5
S.D.) Hz. The average cutoff frequency for the sample was 16.3
(± 1.7) Hz. The average preferred temporal frequency
(7.0 ± 2.6 Hz) and cutoff frequency (20.4 ± 6.9
Hz) of the XOR were significantly higher. The differences averaged
1.1 (± 0.6) octaves for the peaks and 0.3 (± 0.4)
octaves for the cutoffs. The XOR mechanism's preference
for high temporal frequencies suggests a possible extrastriate
origin for the effect and could help explain the low-pass
temporal-frequency response profile displayed by most striate
cortical neurons.
Publisher
Cambridge University Press (CUP)
Subject
Sensory Systems,Physiology
Cited by
45 articles.
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