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Yıl:2018; Cilt: 29; Sayı: 4>> Özet
TAM METİN
Türk Psikiyatri Dergisi; 2018;29(4):229-237
Şizofrenide Yüzdeki Duygu İfadelerini Tanıma Sırasındaki Prefrontal Korteks Aktivitesinin Klinik Belirtiler veSosyal Biliş İşlevleriyle İlişkisi
A Abdullayev, B Baskak, NS Baskak, Y Kır, E Kale, HD Özgüven, Z Baran, I Yenihayat
Caspian International Hospital
Amaç: Bu çalışmada şizofreni hastalarında yüzdeki duygulanımı tanımaya eşlik eden prefrontal korteks (PFK) aktivitesini incelemeyi ve bu aktivitenin zihin kuramı bozukluğu ve klinik belirtilerle ilişkili olup olmadığını araştırmayı amaçladık. Yöntem: İşlevsel yakın kızılötesi spektroskopi (fNIRS) ile frontal kortikal aktiviteyi ölçmek için yüzdeki duygulanım ifadelerinden oluşan standart bir fotoğraf kümesi ile oluşturulan bir nörogörüntüleme görevi kullanılmıştır. DSM-IV’e göre şizofreni ve şizofreniform bozukluk tanısı konan 27 hasta [vaka grubu (VG)] ve 25 sağlıklı kontrol vakasından [Kontrol Grubu (KG)] elde edilen veriler karşılaştırılmıştır. Kontrol koşulu yüzdeki non-afektif değişiklikleri saptama şeklinde belirlenmiştir. Sonra PFK aktivitesiyle klinik belirtiler ve yanlış inancı anlama, pot kırmayı anlama, imayı anlama becerileri arasındaki ilişki incelenmiştir. Bulgular: Prefrontal aktivite afektif ve non-afektif koşulda VG’de KG’ye göre daha yüksek; sosyal bilişsel işlevlerse VG’de, KG’den düşük bulunmuştur. Sosyal bilişsel işlevlerle PFK aktivitesi arasında bir ilişki bulunmamıştır. Her iki grupta da eğitim durumu ve yaşla PFK aktivitesi arasında korelasyon saptanmamıştır. VG’de Pozitif Belirti Değerlendirme Ölçeği (PBDÖ) varsanı toplam puanı, sağ ventral prefrontal korteks (VPFK) ve sağ medial prefrontal korteks (mPFK) aktiviteleriyle ilişkili bulunmuştur. Sonuç: Şizofrenide yüze ait değişikliklerin saptanması sırasında ortaya çıkan bir hiperfrontaliteden söz edilebilir. Bulgular şizofreni hastalarının yüzdeki afektif ve non-afektif değişiklikleri tanımada aynı performansı sergileyebilmek için sağlıklı kişilere göre daha fazla frontal kaynağa gereksinim duyduğu yönünde yorumlanabilir. Şizofrenide varsanılarla yüzdeki ifadeyi işleme arasında bir ilişki olabilir.
Prefrontal Cortex Activity During Facial Affect Processing in Schizophrenia: Association with Clinical Symptoms and SocialCognitive Functions Cognitive Functions
Objectives: In the present study, we aimed to investigate the prefrontal cortex (PFC) activity during facial affect recognition in schizophrenia, as well as the association of this activity with symptom severity and with the higher order social cognitive functions, namely recognition of false beliefs, faux-pas and hinting. Method: Functional near infrared spectroscopy (fNIRS) was used to measure frontal cortical activity during a neuroimaging task prepared with a standard set of pictures of facial affect. The data of the Index Group (IG) consisting of 27 subjects with DSM-IV based diagnoses of schizophrenia and schizophreniform disorder and control group (CG) (N=25) were compared. The control condition was to detect nonaffective changes on a neutral face. Associations with frontal activity during affect recognition and clinical symptoms, false belief recognition, hinting and faux-pas were investigated. Results: Prefrontal activity during both affective and non-affective conditions was higher in the IG than the CG. The IG performed worse than the CG in social cognitive tests. Social cognitive test performance was not correlated with cortical activity. There were no correlations between education status, age and PFC activity in both groups. In the IG, right ventral prefrontal cortex (VPFC) and right medial prefrontal cortex (mPFC) activities were associated with hallucination severity. Conclusion: These results suggest the presence of hyperfrontality during face processing in schizophrenia. Results also suggest that schizophrenia patients require more frontal resources to achieve a performance comparable to that of healthy controls in order to detect both affective and non-affective changes on a face. There might be a relationship between facial processing and hallucinations.

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