Conditions of perceptual selection and suppression during interocular rivalry in strabismic and normal cats
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Conditions of perceptual selection and suppression during interocular rivalry in strabismic and normal cats. / Fries, P; Schröder, J H; Singer, W; Engel, A K.
In: VISION RES, Vol. 41, No. 6, 01.03.2001, p. 771-83.Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review
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TY - JOUR
T1 - Conditions of perceptual selection and suppression during interocular rivalry in strabismic and normal cats
AU - Fries, P
AU - Schröder, J H
AU - Singer, W
AU - Engel, A K
PY - 2001/3/1
Y1 - 2001/3/1
N2 - Presenting the two eyes with incongruent stimuli leads to the phenomenon of interocular rivalry. At any given time, one of the stimuli is perceptually suppressed in order to avoid double vision. In squinting subjects, rivalry occurs permanently also for congruent stimuli because of developmental rearrangement of cortical circuitry. In this study, we have investigated the dynamics and stimulus dependence of rivalry in six esotropic, four exotropic and three non-strabismic cats. As an indicator for perception, we used optokinetic nystagmus that was induced by moving gratings. The esotropic cats were tested for their visual acuity by means of a jumping stand procedure. The results show that one eye can dominate perception even if both eyes have equal visual acuity and are presented with stimuli of equal contrast. Strong eye dominance asymmetry was found in all but one of the tested cats. Notably, all three of the normal cats showed a clear asymmetry in perceptual selection. Measurements with varying contrast and velocity of the stimuli revealed that the influence of these parameters on perceptual selection was independent of the presence of strabismus. In all cats, the time during which a given eye dominated perception increased with the contrast and decreases with the velocity of the stimulus presented to this eye.
AB - Presenting the two eyes with incongruent stimuli leads to the phenomenon of interocular rivalry. At any given time, one of the stimuli is perceptually suppressed in order to avoid double vision. In squinting subjects, rivalry occurs permanently also for congruent stimuli because of developmental rearrangement of cortical circuitry. In this study, we have investigated the dynamics and stimulus dependence of rivalry in six esotropic, four exotropic and three non-strabismic cats. As an indicator for perception, we used optokinetic nystagmus that was induced by moving gratings. The esotropic cats were tested for their visual acuity by means of a jumping stand procedure. The results show that one eye can dominate perception even if both eyes have equal visual acuity and are presented with stimuli of equal contrast. Strong eye dominance asymmetry was found in all but one of the tested cats. Notably, all three of the normal cats showed a clear asymmetry in perceptual selection. Measurements with varying contrast and velocity of the stimuli revealed that the influence of these parameters on perceptual selection was independent of the presence of strabismus. In all cats, the time during which a given eye dominated perception increased with the contrast and decreases with the velocity of the stimulus presented to this eye.
KW - Animals
KW - Cats
KW - Dominance, Cerebral
KW - Esotropia
KW - Exotropia
KW - Nystagmus, Optokinetic
KW - Perceptual Masking
KW - Psychophysics
KW - Vision Disparity
KW - Visual Acuity
M3 - SCORING: Journal article
C2 - 11248265
VL - 41
SP - 771
EP - 783
JO - VISION RES
JF - VISION RES
SN - 0042-6989
IS - 6
ER -
