Dergi Ara >>
Yıl:2018; Cilt: 19; Sayı: 6>> Özet
TAM METİN
Anadolu Psikiyatri Dergisi; 2018;19(6):545-550
Bilişsel ikili görev testinde karamsarlık ve iyimserliğin nöroanatomik ilişkileri
R Saylık
Muş Üniversitesi, Muş
Amaç: Bilişsel psikoloji alanında yapılan davranışsal çalışmalar, karamsarlık eğiliminin iyimserlik eğilimine göre bilişsel testlerin uygulanması sırasında daha düşük performansa neden olduğunu göstermiştir. Bu düşük perfor-mansın nöroanatomik ilişkileri henüz bilinmemektedir. Bu çalışmanın amacı ikili görev testinde karamsarlık ve iyimserliğin nöroanatomik ilişkilerini incelemektir. Yöntem: Bunu test etmek için, 200 katılımcı Yaşama Uyum Testi kullanılarak tarama yöntemiyle yüksek düzeyde 10 karamsar ve 11 iyimser katılımcı seçildi. Bu katılımcıların beyin aktivasyonları incelenerek MRI içinde tekli ve çoklu görevler içeren testler uygulandı. Sonuçlar: Davranışsal sonuç-lar karamsar katılımcıların iyimser olanlara göre ikili görev testinde daha yavaş olduklarını gösterdi. MRI, karamsar katılımcılarda iyimser olanlara göre pariyetal ve oksipital kortekslerde, posterior singulat girustan başlayıp preku-neus ve kuneusa kadar uzanan daha düşük aktivasyonlar gösterdi. Tartışma: Tartışmada karamsarlığın iyimserliğe göre bilişsel performans düşüklüğüne neden olduğu ve bu bilişsel düşüklüğün pariyetal ve oksipital alanlarda daha düşük aktivasyonlara eşlik ettiği değerlendirildi.
Neural correlates of dispositional pessimism and optimism on dual-task performance
Objective: Behavioral studies found that dispositional pessimism (DP) impairs cognitive task performance (i.e. dual task) such as in dual task processing as compared to dispositional optimism (DO). However, neuroanatomical corre-lates of these performance decrements are still unknown. Therefore, the current study aims at investigating neural correlates of pessimism and optimism on dual task performance. Methods: To test for this, two hundred participants were screened to create extreme groups of DP (i.e. 10 participants) and DO (11 participants) based on Life Orien-tation Test (LOT). The participants performed auditory and visual single tasks and dual tasks while their brain activity by means of functional magnetic resonance imaging (fMRI) was recorded. Results: Behavioral results showed that the groups have similar performance on single task performance whereas DP group slowed down on dual task performance as compared to DO group. Imaging results showed that DP group showed less dual task specific activations in inferior parietal and occipital cortices particularly in posterior cingulate gyrus, extending into precuneus and cuneus. Discussion: It has been concluded that DP impairs cognitive processing on dual task performance and this impairment accompanied by reduced activation in parietal and occipital cortices as compared to DO.

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