Asymmetrical brain activity discriminates between positive and negative affective stimuli in human infants

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Science  17 Dec 1982:
Vol. 218, Issue 4578, pp. 1235-1237
DOI: 10.1126/science.7146906


Ten-month-old infants viewed videotape segments of an actress spontaneously generating a happy or sad facial expression. Brain activity was recorded from the left and right frontal and parietal scalp regions. In two studies, infants showed greater activation of the left frontal than of the right frontal area in response to the happy segments. Parietal asymmetry failed to discriminate between the conditions. Differential lateralization of the hemispheres for affective processes seems to be established by 10 months of age.

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