Amygdala responses to unpleasant pictures are influenced by task demands and positive affect trait

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dc.contributor.authorSanchez, Tiago A.
dc.contributor.authorMocaiber, Izabela
dc.contributor.authorErthal, Fatima S.
dc.contributor.authorJoffily, Mateus
dc.contributor.authorVolchan, Eliane
dc.contributor.authorPereira, Mirtes G.
dc.contributor.authorAraújo, Dráulio Barros de
dc.contributor.authorOliveira, Leticia
dc.date.accessioned2017-05-26T14:01:09Z
dc.date.available2017-05-26T14:01:09Z
dc.date.issued2015-03-04
dc.description.resumoThe role of attention in emotional processing is still the subject of debate. Recent studies have found that high positive affect in approach motivation narrows attention. Furthermore, the positive affect trait has been suggested as an important component for determining human variability in threat reactivity. We employed functional magnetic resonance imaging to investigate whether different states of attention control would modulate amygdala responses to highly unpleasant pictures relative to neutral and whether this modulation would be influenced by the positive affect trait. Participants (n = 22, 12 male) were scanned while viewing neutral (people) or unpleasant pictures (mutilated bodies) flanked by two peripheral bars. They were instructed to (a) judge the picture content as unpleasant or neutral or (b) to judge the difference in orientation between the bars in an easy condition (0 or 90∘ orientation difference) or (c) in a hard condition (0 or 6∘ orientation difference). Whole brain analysis revealed a task main effect of brain areas related to the experimental manipulation of attentional control, including the amygdala, dorsolateral prefrontal cortex, and posterior parietal cortex. Region of interest analysis showed an inverse correlation (r = -0.51, p < 0.01) between left amygdala activation and positive affect level when participants viewed unpleasant stimuli and judged bar orientation in the easy condition. This result suggests that subjects with high positive affect exhibit lower amygdala reactivity to distracting unpleasant pictures. In conclusion, the current study suggests that positive affect modulates attention effect on unpleasant pictures, therefore attenuating emotional responses.pt_BR
dc.identifier.doi10.3389/fnhum.2015.00107
dc.identifier.urihttps://repositorio.ufrn.br/jspui/handle/123456789/23114
dc.languageengpt_BR
dc.rightsAcesso Abertopt_BR
dc.subjectamygdalapt_BR
dc.subjectattentionpt_BR
dc.subjectemotionpt_BR
dc.subjectemotion regulationpt_BR
dc.subjectpositive affectpt_BR
dc.subjectfMRIpt_BR
dc.subjectPANASpt_BR
dc.titleAmygdala responses to unpleasant pictures are influenced by task demands and positive affect traitpt_BR
dc.typearticlept_BR

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