Assimetrias hemisféricas na percepção de expressões faciais: um estudo com a técnica de campo visual dividido

Abstract

Resumo: Foram investigadas as diferenças hemisféricas na percepção de expressões faciais de alegria, tristeza, raiva e medo. Vinte e um voluntários (9H, 12M) participaram do experimento. Foi utilizada a técnica de estudo campo visual dividido com a apresentação de faces à esquerda e à direita do ponto de fixação nas condições: 1) face com emoção à esquerda e face neutra à direita; 2) face neutra à esquerda e face com emoção à direita; 3) face com emoção à direita e à esquerda; 4) face neutra à direita e à esquerda. Os participantes determinaram o lado em que havia sido apresentada a face que aparentava expressar mais emoção.As análises de tempo de resposta revelaram que tristeza e medo foram identificadas mais rapidamente no campo visual esquerdo, o que indicaria uma vantagem do hemisfério direito no reconhecimento dessas expressões. O reconhecimento de expressões negativas pelo hemisfé-rio direito concorda parcialmente com a hipótese da valência.

Conscious and unconscious processing of facial expressions: Evidence from two split‐brain patients

“…The present results are also in agreement with the findings of Tamietto et al . () and Torro‐Alves, de Sousa, and Fukusima () that, presenting explicit emotional faces bilaterally to healthy subjects, found better performance with emotional stimuli presented in the LVF, mainly when they were negative.…”

Right hemisphere or valence hypothesis, or both? The processing of hybrid faces in the intact and callosotomized brain

“…As mentioned above, however, the results of the majority of studies have tended to interpret their laterality results as exclusively in favor of either the VH or the RHH. For example, asked participants to recognize a target emotion in a divided visual field paradigm in which the target and a distracting expression were simultaneously presented, finding that emotional targets were better and faster recognized when presented in the left visual field, supporting the RHH (Torro-Alves et al, 2011). In contrast, Jansari et al ( 2Q4 011), using a similar paradigm, found support for the VH, since positive emotions were better recognized when presented in the right visual field (RVF) and negative emotions were better recognized when presented in the left visual field (LVF).…”

Contrasting hemispheric asymmetries for emotional processing from event-related potentials and behavioral responses.

“…By using a similar lateralized presentation, different results have been collected. For instance, Torro-Alves, de Sousa, and Fukusima (2011) asked participants to recognize a target emotion in a paradigm in which the target and a distracting expression were simultaneously presented. The authors found that emotional targets were better and faster recognized when presented in the LVF, supporting the RHH.…”