Temel Duygusal Durumların Hemodinamik Karşılıklarının Taşınabilir bir İşlevsel Yakın Kızılaltı Spektroskopi Sistemi ile Tanımlanması

Amaç: Bu çalışmanın amacı, bir işlevsel yakın kızılaltı spektroskopi (İYKAS) sisteminin nötral, olumsuz ve olumlu değerlikli duygusal uyarıların sebep oldukları beyin hemodinamik etkinliklerinin uzamsal yerleşimlerindeki benzerlik ve farklılıkları niceliklendirmedeki uygunluğunu test etmektir.Yöntemler: 13 sağlıklı denek, Uluslarası Duygusal Resim Sistemi (IAPS) veritabanından alınan nötral, hoşa giden ve hoşa gitmeyen içerikli resimleri blok bir deney tasarımı içerisinde izlerlerken, duygusal uyaranların sebep olduğu prefrontal kortikal hemodinamik değişimler alın bölgesine yerleştirilen 20 kanallı bir İYKAS sistemi ile ölçüldü.Bulgular: Olumsuz değerlikli resimler dorsolateral ve orbitofrontal korteksi kapsayan sağ lateral bölgelerde olumlu ve nötral değerlikli resimlere göre daha yüksek hemodinamik etkinliğe sebep oldu (pFDR<0.05). Her uyarı durumu, İYKAS ile tanımlanabilen, belirgin ve ayrışabilir bir kortikal hemodinamik etkinlik örüntüsüne sebep oldu.Sonuç: Bulgularımız, farklı temel duyguların prefrontal korteks bölgesinde taşınabilir bir İYKAS sistemi ile ölçülebilen, ayrışabilir ve farklı yerleşime sahip hemodinamik karşılıkları oldukları görüşünü desteklemektedir. Farklı duygusal durumlar ile ilişkili farklı kortikal hemodinamik etkinlik örüntülerinin bulunması, İYKAS teknolojisinin gelecek sağlık ve gündelik hayat uygulamalarında, duyguları nesnel ve gerçek zamanlı çözümleme potansiyelini göstermektedir.

Anahtar Kelimeler:

İşlevsel yakın kızılaltı spektroskopi, beyin bilgisayar arayüzü, prefrontal kortex, duygusal değerlik

Identification of the hemodynamic correlates of basic emotional states with a mobile functional near infrared spectroscopy system

Aim: The aim of this study was to evaluate the feasibility of a functional near infrared spectroscopy (fNIRS) system, for quantification of the similarities and differences in the spatial localization of cerebral hemodynamic activation, induced by visual presentation of neutral, negative and positive valence emotional stimuli.Method: Thirteen healthy subjects viewed neutral, pleasant and unpleasant pictures from the International Affective Picture System (IAPS) database in a block design experiment while the prefrontal cortical hemodynamic changes induced by emotional stimuli were continuously recorded with a 20 channel fNIRS system that covered the forehead region.Results: Negative valence pictures induced higher hemodynamic activity in right lateralized regions involving dorsolateral and orbitofrontal cortex, when compared to neutral and positive valence stimuli (pFDR<0.05). Each stimulus condition induced a distinct cortical activation pattern that could be identified with fNIRS.Conclusion: Our findings support the notion that different basic emotions have distinct localization and separable hemodynamic correlates in the prefrontal cortex region, which can be detected with a mobile fNIRS system. The distinct cortical hemodynamic activity patterns associated with each emotional state show the potential of fNIRS technology for decoding and differentiating basic emotions objectively and real time for future clinical and daily life applications.

Keywords:

Functional near infrared spectroscopy, brain computer interfaces, prefrontal cortex, emotional valence,

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