EVRİM GÜLBETEKİN, OSMAN İYİLİKCİ, SONİA AMADO, HAKAN ÇETİNKAYA, SEDA DURAL ÇETİNKAYA

Mutluluğun yüzdeki ifadesinde ve algılanmasında hemisferik asimetri

Kişiler arası iletişimde önemli bir rol oynayan mutluluğun yüzsel ifadesine ve algısına ilişkin hemisferik asimetriler farklı tekniklerle çalışılmıştır. Ancak, asimetrinin kaynağının ytizön sahibi mi yoksa, yüzü gözlemleyen kişi mi olduğu henüz açık değildir. Deney I'de mutluluk ifadesinin hangi (sağ/sol) yarı-yüzde daha iyi tanındığı incelenmiştir. Denekler sağ tarafında mutluluk ifadesi bulunan yüzleri daha ifade edici bulmuşlardır. Deney Il'de bu yanlılığın gözlemcideki hemisferik asimetriden mi yoksa poz veren kişinin yüzündeki asimetriden mi kaynaklandığının belirlenmesi hedeflenmiştir. Uyarıcılar çok kısa bir süre ile sol görsel alanda (SOGA) /sağ hemisfere (SAH) veya sağ görsel alanda (SAGA) /sol hemisfere (SOH) sunulmuştur. Yüzler SOGA koşulunda daha htzlı değerlendirilmiş; ancak, SAGA koşulunda daha ifade edici olarak değerlendirlmiştir. Sağ tarafı mutlu olan yüzler SAGA koşulunda daha ifade edici bulunmuştur. Sonuçlar, mutluluk ifadesinin tanınmasında bir sol hemisfer başatlığına ve genel yüz işleme hızında da bir sağ hemisfer başatlığına işaret etmektedir. Ek olarak bulgular, deneklerin değerlendirme süresinde ve değerlendirme puanlarında bir cinsiyet farkı olduğunu göstermiştir. Erkekler, uyarıcıları sağ hemisfer koşulunda, sol hemisfer koşulunda olduğundan daha hızlı değerlendirmişlerdir. Kadınlar ise uyarıcıları, sol hemisfer koşulunda, sağ hemisfer koşulundan daha yüksek puan ile değerlendirmiştir.

Hemispheric asymmetry in expression and perception of happiness

Hemispheric asymmetries in happiness expression -which has an important role in interpersonal communication and its perception- have been studied using different techniques. However, it is not clear whether the source of the asymmetry is the poser or the observer. In Experiment I, we investigated on which hemiface (right/left) the expression of happiness was better identified. Subjects evaluated right-sided happy chimeric faces as more expressive. In Experiment II, we examined whether the source of the bias was the observer's hemispheric asymmetry or the poser's facial asymmetry. Stimuli were briefly presented unilaterally, either in the left visual field(LVF)/right hemisphere(RL) or in the right visual field(RVF)/left hemisphere(LH). Faces were recognized faster in LVF condition, but they were evaluated as more expressive in RVF condition. Right-sided happy faces were found to be more expressive in RVF condition. Results indicated LH superiority in the recognition of happy expression and a RH superiority in the duration of facial processing. Additionally findings pointed out a sex difference in subjects' evaluation time and evaluation scores. Men evaluated the stimuli faster in the RH condition than they did in the LH condition; while women evaluated the faces with higher scores in LH than they did in RH condition.

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