Table 1.

Outline of behavioral training procedures

Experiment 1
Group	Element training	Compound	Test
Over (no Vis)	A→food, B→nothing, C→food	AC→food	A? B? C? V?
Over (Vis)	A→food, B→nothing, C→food	VAC→food	A? B? C? V?
CTL (no Vis)	A→food, B→nothing, C→food	BC→food	A? B? C? V?
CTL (Vis)	A→food, B→nothing, C→food	VBC→food	A? B? C? V?

Experiment 2
Group	Compound training	Summation test	Retardation test
Over	VAC→food, A→food, B→no food, C→food	A, VA, C, VC, B, VB, V, VAC, VBC	V→food
CTL	VBC→food, A→food, B→no food, C→food	A, VA, C, VC, B, VB, V, VAC, VBC	V→food

Over = Overexpectation treatment; CTL = control treatment; Vis and no Vis refer to the presence or absence of a visual cue (V) in the compound training phase. A and B were a tone or a noise (counterbalanced) and C was a clicker. Rats with excitotoxic or sham lesions of central or basolateral amygdala were equally represented in each training condition (group).

Over = Overexpectation treatment; CTL = control treatment; A and B were a tone or a noise (counterbalanced), C was a clicker, and V was a visual conditioned stimulus. All CS element and compound presentations in the summation test were nonreinforced. Rats with excitotoxic or sham lesions of central or basolateral amygdala were equally represented in each group.