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Journal Article

Emotional cognition without awareness after unilateral temporal lobectomy in humans


Murai,  Toshia
MPI of Cognitive Neuroscience (Leipzig, -2003), The Prior Institutes, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Kubota, Y., Sato, W., Murai, T., Toichi, M., Ikeda, A., & Sengoku, A. (2000). Emotional cognition without awareness after unilateral temporal lobectomy in humans. The Journal of Neuroscience, 20(19).

Cite as: http://hdl.handle.net/11858/00-001M-0000-0010-B0B9-1
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 sub- jects were investigated after unilateral temporal lobectomy. Emotionally valenced photographic slides (10 negative, 10 neu- tral) from the International Affective Picture System were pre- sented 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 com- pared 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.