A number of studies have linked the amygdala to the processing of motivational significance of stimuli and to the control of emotion (Davis 1992; Everitt et al 2003; LeDoux 2000, 2003). These include studies based on single-unit recordings in rats (eg, Schoenbaum et al 2000), studies in monkeys (Rolls 1999), and human fMRI studies (eg, Aharon et al 2001; Breiter et al 2001).