Analysis of Evoked EEG Synchronization and Desynchronization During Perception of Emotiogenic Stimuli: Association with Autonomic Activation Processes |
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Authors: | L I Aftanas L N Savotina V P Makhnev N V Reva |
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Institution: | (1) Psychophysiology Laboratory, State Science Research Institute of Physiology, Siberian Division, Russian Academy of Medical Sciences, 4 Timakov Street, 630117 Novosibirsk, Russia |
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Abstract: | The cortical apparatus involved in performing autonomic responses in conditions of emotional activation has received little
study. The aim of the present work was to assess the dynamics of evoked EEG synchronization and desynchronization at different
frequency ranges during the perception of emotiogenic visual stimuli depending on the extent of accompanying autonomic activation
as measured by skin galvanic responses. Studies were performed on 33 students (all right-handed) aged 18–28 years. Difference
between subjects with weak (SGR-) and strong (SGR+) skin galvanic responses were seen only in the θ1 range (4–6 Hz). At the stage at which emotiogenic information was perceived
(the first second after the start of stimulus presentation), both groups showed similar dynamics of increases in evoked synchronization
in the parietal-temporal-occipital areas of the cortex, with greater involvement of the right hemisphere. From the second
second to the end of presentation (2–6 sec), emotiogenic signals gave significantly greater levels of evoked synchronization
in these cortical areas as compared with neutral stimuli, and only in the SGR+ group. These data provide evidence for the involvement of the posterior areas of the cortex of the right hemisphere in the
mechanisms of motivational attention and sympathetic activation.
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Translated from Rossiiskii Fiziologicheskii Zhurnal imeni I. M. Sechenova, Vol. 90, No. 11, pp. 1314–1323, November, 2004. |
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Keywords: | EEG emotion theta rhythm evoked synchronization/desynchronization skin galvanic responses |
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