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Yıl:2011; Cilt: 1; Sayı: 3>> Özet
Güncel Psikiyatri ve Psikonörofarmakoloji; 2011;1(3):17-21
Low Baseline Prepulse Inhibition Predicts Reduced Social Interaction in Rats
H Kayır, KG Ulusoy, G Göktalay
GATA, Ankara
Amaç: Şizofreni semptomları; pozitif, negatif ve bilişsel semptomlar olmak üzere üç genel kategoride değerlendirilmektedir. Sesle oluşturulan
irkilme refleksinin ön-uyaran aracılı inhibisyonunun bozulması, sıklıkla deney hayvanlarında pozitif semptomları modellemek için kullanılmaktadır.
Diğer taraftan sosyal etkileşimde azalma negatif semptomların sık kullanılan bir modelidir. Bu çalışmada biz ön-uyaran aracılı inhibisyonun, sosyal
etkileşim üzerinden negatif semptomlar hakkında bilgi verip vermediğini test etmeyi amaçladık.
Yöntem: Erkek, erişkin (3-4 aylık) Wistar sıçanlar bazal ön-uyaran aracılı inhibisyon değerlerine göre (yüksek-inhibisyonlu, orta-inhibisyonlu, düşük
inhibisyonlu) üç gruba (n= 10) ayrılmıştır. Orta- inhibisyonlu grup çalışmadan çıkarılmıştır. Yüksek ve düşük inhibisonlu gruplardaki sıçanlar aynı
grup içerisinde eşleştirilmiş ve çiftlerdeki sosyal etkileşim test edilmiştir.
Bulgular: Düşük ve yüksek inhibisyonlu grupların ön-uyaran aracılı inhibisyon değerleri arasında istatistiksel olarak anlamlı fark bulunmuştur. Düşük
inhibisyonlu grubun sosyal etkileşim süreleri ve yürüme mesafeleri, yüksek inhibisyonlu gruba göre azalmıştır.
Yorum: Bulgularımız ön-uyaran aracılı inhibisyon testinin, şizofreninin pozitif semptomları yanında sosyal etkileşim performansı dolayısıyla negatif
semptomlar hakkında da bilgi verebileceğine işaret etmektedir.
Low Baseline Prepulse Inhibition Predicts Reduced Social Interaction in Rats
Objective: The symptoms of schizophrenia fall into three general categories; positive, negative and
cognitive symptoms. Disruption of prepulse inhibition (PPI) of acoustic startle reflex is commonly used to
model positive symptoms in experimental animals. On the other hand deficient social interaction (SI) is a
common model of negative symptoms. Here we aimed to test whether PPI gave any information about
negative symptoms in means of social interaction.
Methods: Male, adult (3-4 [month]s old) Wistar rats were assigned to three groups (n=10) according to
their baseline PPI values [high-inhibitory (HI), middle-inhibitory and low-inhibitory (LI)]. The middle-inhibitory
group was excluded from the study. Rats in HI and LI groups paired within the same groups and
pairs were tested for social interaction.
Results: A significant difference between the PPI values of HI and LI groups was present. Social interaction
time and walked distance of LI rats were significantly reduced compared to HI rats.
Conclusion: Our results imply that PPI test may predict SI performance, thus can give information about
negative symptoms, as well as the positive symptoms of schizophrenia.

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