Brain asymmetry and autonomic conditioning: Sensitization control |
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Authors: | Bjørn Helge Johnsen Kenneth Hugdahl |
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Affiliation: | 1. Department of Biological and Medical Psychology, University of Bergen, Aarstadveien 21, N-5009, Bergen, Norway
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Abstract: | In the present experiment we report effects of cerebral asymmetry, or laterality, during classical conditioning to facial emotional stimuli. Twenty-five female subjects were presented with slides of a happy face in one visual half-field (VHF), and simultaneously a slide of an angry face in the other VHF, followed by shock as the unconditioned stimulus (UCS). To control for effects of sensitization, a new stimulus, never associated with the UCS, was introduced in the extinction phase. Dependent measures were phasic heart rate responses (HR) and skin conductance responses (SCR). The HR results showed a significant right hemisphere effect for the CS-UCS association, that was not attributable to UCS sensitization. No significant effects were found for the SCRs. The basic HR finding was a right hemisphere superiority for learning of a conditioned association. |
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Keywords: | Classical conditioning sensitization hemispheric asymmetry heart rate responses skin conductance responses facial emotional expressions visual half-field |
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