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The Journal of Neuroscience, 0000, 20:RC97:1-5

RAPID COMMUNICATION
Emotional Cognition without Awareness after Unilateral Temporal Lobectomy in Humans

Yasutaka Kubota¹, Wataru Sato², Toshiya Murai³, Motomi Toichi⁴, Akio Ikeda⁵, and Akira Sengoku¹

¹ Department of Neuropsychiatry, Faculty of Medicine, Kyoto University, Kyoto, Japan, ² Department of Cognitive Psychology in Education, Kyoto University, Kyoto, Japan, ³ Max-Planck-Institute of Cognitive Neuroscience, Leipzig, Germany, ⁴ Health and Medical Services Center, Shiga University, Shiga, Japan, and ⁵ Department of Brain Pathophysiology, Faculty of Medicine, Kyoto University, Kyoto, Japan

To investigate the function of the amygdala in human emotional cognition, we investigated the electrodermal activity (EDA) in response to masked (unseen) visual stimuli. Six epileptic subjects were investigated after unilateral temporal lobectomy. Emotionally valenced photographic slides (10 negative, 10 neutral) from the International Affective Picture System were presented to their unilateral visual fields under either subliminal or supraliminal conditions. An interaction between hemispheres and emotional valences was found only under the subliminal conditions; greater EDA responses to negative stimuli compared with neutral ones were observed when stimuli were presented to the intact hemispheres. The findings suggest that nonconscious emotional processing is reflected in EDA in a different manner from conscious emotional processing. Medial temporal structures, including the amygdala, thus appear to play a critical role in the neural substrates for this automatic processing.

Key words: amygdala; unilateral temporal lobectomy; emotion; emotional visual stimuli; backward masking; awareness; EDA

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Copyright © 0000 Society for Neuroscience  0270-6474/00/$05.00/0

This article has been cited by other articles:

				H. Oya, H. Kawasaki, M. A. Howard III, and R. Adolphs Electrophysiological Responses in the Human Amygdala Discriminate Emotion Categories of Complex Visual Stimuli J. Neurosci., November 1, 2002; 22(21): 9502 - 9512. [Abstract] [Full Text] [PDF]

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