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Yıl:1995; Cilt: 6; Sayı: 3>> Özet
Türk Psikiyatri Dergisi; 1995;6(3):186-192
Obsesif Kompulsif Bozuklukta Olaya İlişkin Endojen Polansiyel Değişimleri
T KARAMAN, S ÖZKAYNAK, K YALTKAYA, Ç BÜYÜKBERKER, B AKTEKİN, Z ÖNAL
Bu çalışmada obsesif kompulsif bozuklukta (OKB) bilişsel işlevler, olaya ilişkin endojen potansiyeller (OIEP) aracılığı ile araştırılmıştır. Bu nedenle 20 OKB tanısı almış hasta ve 30 normal bireyde işitsel-P300 ve beklentisel negatif değişim (BND) bileşenleri değerlendirilmiştir. İlaç kullanmayan obsesif kompulsif hastalarda N100 latansında uzama, N100/P200 genliğinde azalma ve N200/P300 genliğinde ise artma saptanmıştır. N100, N100/P200 gibi erken bileşenler ve N200/P300, P300 gibi geç bileşenler seçici dikkatin birbirinden farklı iki tarzı olan “uyaran kümesi” ve “yanıt kümesi”ne karşılık gelmektedir. Bu bakımdan sonuçlar, obsesif kompulsif hastaların, uyaranların alınmasında, alınan uyaranların işlenişi sırasında bilişsel olarak ayrıntıya girmede ve düşüncelerine ket vurmada güçlük çektiklerini göstermiştir. BND latansında uzama bulgularının ise hastaların karar verme sürecinde gecikme eğilimi ile bağlantılı olabileceği düşünülmüştür.

Variations of Endogenous Event-Related Potentials in Obsessive-Compulsive Disorder
In this study, cognitive functions in obsessive-compulsive disorder (OCD) were investigated using endogenous event-related potentials (ERPs). Components of auditory-P300 and contingent negative variation (CNV) were assessed in OCD patients and 30 normal controls. Unmedicated OCD patients had prolonged N100 latency, and reduced N100/P200 and enhanced N200/P300 amplitudes. Early (N100, N100/P200) and late (N200, N200/P300) components are signs of fundamentally different selective attention processes, corresponding closely to the “stimulus set” and “response set” modes of attentions. These findings indicated that OCD patients had difficulties in receiving stimuli, processing these stimuli with further perceptual analysis, eliminating irrelevant stimuli and inhibiting thoughts. Prolonged latency of the CNV which the patients also exhibited could be related with delay in decision making.

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