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Yıl:2024; Cilt: 35; Sayı: 2>> Özet
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Türk Psikiyatri Dergisi; 2024;35(2):156-161
Olgu Sunumu: Tourette Sendromunda İkinci Düzey Kontrast Duyarlılığı
OC Pinho,MF Costa,GS Souza
São Paulo Üniversitesi,Brezilya
Gilles de la Tourette Sendromu (GTS), motor veya vokal tikler ile karakterize nöropsikiyatrik gelişimsel bir hastalıktır. Vakaların oftalmolojik muayenelerinde göz yapılarında herhangi bir değişikliğe rastlanmaz. Görme alanı değerlendirmelerinde, merkezi görme alanı hassasiyetinde azalma gözlemlenir. Bu popülasyonun görme işlevleri üzerine yürütülen az miktarda çalışma olması nedeniyle bu olgu sunumunun amacı, görme şikayetleri olmayan bir GTS hastasının ikinci düzey görüş için kontrast duyarlılığında önemli değişiklikler olduğunu göstermektir. Bu azalma, beyaz gürültü taşıyıcısıyla test edilen tüm uzay frekanslarındaki kontrast duyarlılığı ölçümlerinde gözlemlenmiştir. Pembe gürültü taşıyıcılı birinci ve ikinci düzeyde uyarıcılarda ortalama kontrast duyarlılığı normal bulunmuştur. Birçok lokal parlaklık bileşeninin rol oynadığı ve dolayısıyla lokal ve lateral inhibisyona dayanan beyaz gürültü taşıyıcılı ikinci düzey kontrast duyarlılığı, spesifik görüntü işleme mekanizmalarının etkilendiğini göstermektedir.
Case Report: Second-order Contrast Sensitivity in Tourette Syndrome
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.

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