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Yıl:2012; Cilt: 15; Sayı: 29>> Özet
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Türk Psikoloji Yazıları; 2012;15(29):13-24
Serotoninin Bilişsel İşlevlerdeki Rolü 
M Irak
Bahçeşehir Üniversitesi, İstanbul
Serotonin memelilerde birçok bilişsel işlev ve davranışla yakından ilişkilidir. Bu derleme çalışmasında bilişsel işlevler ve serotonin arasındaki ilişkiyi inceleyen araştırmalar derlenmiş, çeşitli hasta grupları ya da sağlıklı gönüllülerle yürütülen, serotonin düzeyinin farmakolojik olarak değiştirildiği ve bu değişikliğin dikkat, bellek, karar verme ve bilişsel esneklik gibi bilişsel işlevler üzerindeki etkisinin incelendiği çalışmaların sonuçları değerlendirilmiştir. Serotoninin duygusal bilgi işleme süreçleriyle ilişkisi ayrıca incelenmiştir. Bu çalışma kapsamında incelenen farmakolojik müdahaleler yalnızca seçici serotonin geri alım engelleyicilerinin etkisini inceleyen ilaçlarla sınırlı tutulmuştur. Sonuçlar, serotonin düzeyindeki artma ya da azalmanın bilişsel performansı olumlu ya da olumsuz yönde etkilediğini, ayrıca serotonin düzeyindeki değişikliğin bilişsel sisteme girecek ve işelenecek olan bilginin duygusal açıdan türünü (olumlu, olumsuz ya da yansız) etkilediğini göstermiştir. Bu sonuçlar ayrıca serotoninin sisteme giren uyaranların seçimi, uyaranın türüne karar verilmesi, uyaranların bazılarının elenerek sistem dışına atılması ve uyaranların gerektiğinde hatırlanmak üzere bellekte depolanması şeklinde özetlenebilecek bilgi işleme sürecinde önemli bir aracı rolü olduğuna işaret etmektedir.
The Role of Serotonin in Cognitive Functions
There are close relationships between serotonin and several cognitive functions and emotions in mammals. In this study, several studies which investigated the relationship between serotonin and cognitive functions were reviewed. The focus was on the results of previous studies that investigated the psychopharmacological manipulations in either healthy volunteers or different patient groups, and explored the effects of this serotonin manipulation on different cognitive functions such as, attention, memory, decision making, and cognitive flexibility. In addition, the relationship between serotonin and emotional information processing were reviewed separately. Regarding the pharmacological applications, only effects of SSRIs were investigated. Results showed that changes on level of serotonin either have significant positive or negative effect on cognitive functions. Also changes in serotonin level has significant effect on emotional aspects (positive, negative, neutral) of stimulus which are receiving and processing by the cognitive system. Results also indicated that serotonin has an important mediator role in the information processing system by selecting or eliminating the stimulus, deciding the type of stimulus, and also by storing the information which will be retrieved in the future.

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