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Results revealed that the right amygdala and left amygdala/substantia innominata were sensitive to the pupil size of others, exhibiting increased activity for faces with relatively large pupils.

K.E. Demos et al.

Cerebral Cortex (New York, NY) 18 (12), 01 Dec 2008

This effect was observed bilaterally, in the amygdala proper (right amygdala ROI: 27 −7 −15; t [26] = 3.32, P < 0.005) and extended into the substantia innominata within the ventral basal forebrain in the left hemisphere (Left Amygdala/SI ROI: −30 −1 −10; t [26] = 3.96, P < 0.005) ( Fig.

K.E. Demos et al.

Cerebral Cortex (New York, NY) 18 (12), 01 Dec 2008

Greater activity to BIG versus SMALL pupils was observed in both the right amygdala (27 −7 −15) and the left amygdala extending into the substantia innominata within the ventral basal forebrain (−30 −1 −10).

K.E. Demos et al.

Cerebral Cortex (New York, NY) 18 (12), 01 Dec 2008

Results of this analysis revealed a main effect of pupil size in both the left and right amygdala (R Amygdala: F 1,26 = 9.33, P < 0.005; L Amygdala/SI: F 1,26 = 25.67, P < 0.0001), no main effect of facial expression (R Amygdala: F 1,26 = 2.24, P = 0.15; L Amygdala/SI: F < 1), and no interaction (R Amygdala: F < 1; L Amygdala/SI: F 1,26 = 1.84, P = 0.19).

K.E. Demos et al.

Cerebral Cortex (New York, NY) 18 (12), 01 Dec 2008

These findings demonstrate that modulation of pain by ERK signaling in the CeA is functionally lateralized to the right hemisphere, suggesting a dominant role of the right amygdala in pain processing.

Yarimar Carrasquillo et al.

Molecular Pain 4 (7), 23 Jun 2008

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