Case Report: Second-order Contrast Sensitivity in Tourette Syndrome

Otávio Corrêa PİNHO,Marcelo Fernandes da COSTA,Givago da Silva SOUZA
2024 35(2): 156-161
DOI: 10.5080/u26835
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disease, characterized by motor and vocal tics with no changes in the
ocular structures in the ophthalmological evaluations. The visual field
evaluations suggest a reduction in central visual field sensitivity. The
studies on visual function in this population is scarce. In this case report
we present a patient with GTS who has significant alterations in the
measure of contrast sensitivity for second order vision without any vision
complaints. This reduction occurred in the measure of contrast sensitivity
with a white noise carrier for practically all tested space frequencies.
The mean contrast sensitivity for first and second-order stimuli with a
pink-noise carrier was normal. The second order contrast sensitivity with
a white noise carrier is dependent on local and lateral inhibition since
it includes many local luminance components. The existence of this
sensitivity suggests that specific visual processing mechanisms are affected.
Keywords: Tourette Syndrome, Contrast Sensitivity, Contrast
Psychophysical Channels, Second-Order Perception