tailieunhanh - Báo cáo y học: "A psychophysiological investigation of laterality in human emotion elicited by pleasant and unpleasant film clips"

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành y đề tài: A psychophysiological investigation of laterality in human emotion elicited by pleasant and unpleasant film clips. | Kaviani et al. Annals of General Psychiatry 2010 9 38 http content 9 1 38 ANNALS OF GENERAL PSYCHIATRY PRIMARY RESEARCH Open Access A psychophysiological investigation of laterality in human emotion elicited by pleasant and unpleasant film clips Hossein Kaviani1 2 Veena Kumari2 Glenn D Wilson2 Abstract Background Research on laterality in emotion suggests a dichotomy between the brain hemispheres. The present study aimed to investigate this further using a modulated startle reflex paradigm. Methods We examined the effects of left and the right ear stimulation on the modulated startle reflex as indexed by eyeblink magnitude measured from the right eye employing short 2 min film clips to elicit emotions in 16 right-handed healthy participants. The experiment consisted of two consecutive sessions on a single occasion. The acoustic startle probes were presented monaurally to one of the ears in each session counterbalanced across order during the viewing of film clips. Results The findings showed that eyeblink amplitude in relation to acoustic startle probes varied linearly as expected from pleasant through neutral to unpleasant film clips but there was no interaction between monaural probe side and foreground valence. Conclusions Our data indicate the involvement of both hemispheres when affective states and associated startle modulations are produced using materials with both audio and visual properties. From a methodological viewpoint the robustness of film clip material including audio properties might compensate for the insufficient information reaching the ipsilateral hemisphere when using static pictures. From a theoretical viewpoint a right ear advantage for verbal processing may account for the failure to detect the expected hemispheric difference. The verbal component of the clips would have activated the left hemisphere possibly resulting in an increased role for the left hemisphere in both positive and negative affect .