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Functional magnetic resonance imaging (fMRI) of the human brain
was used to compare changes in amygdala activity associated with viewing
facial expressions of fear and anger. Pictures of human faces bearing
expressions of fear or anger, as well as faces with neutral
expressions, were presented to 8 healthy participants. The blood
oxygen-level dependent (BOLD) fMRI signal within the dorsal
amygdala was significantly greater to Fear versus Anger, in a direct
contrast. Significant BOLD signal changes in the ventral amygdala were
observed in contrasts of Fear versus Neutral expressions and, in a more
spatially circumscribed region, to Anger versus Neutral
expressions. Thus, activity in the amygdala is greater to
fearful facial expressions when contrasted with either neutral or angry
faces. Furthermore, directly contrasting fear with angry faces
highlighted involvement of the dorsal amygdaloid region.