Table 2.

Percentage cells (mean ± sem) expressing immediate early genes Arc or Homer1a in medial and lateral divisions of the amygdala central nucleus (CeA). Because equal areas and nearly-equal (see text) numbers of cells were sampled in the two subregions, the percentages shown are directly comparable across subregions. The group designations indicate the nature of training received. Group Omission-Shock (O-S, 8 brains) received training with both a food omission cue and a shock-paired cue, Group Omission Control-Shock (OC-S, 8 brains) received training with a control cue unpaired with food or food omission and with a shock-paired cue, and Group Omission-Shock Control (O-SC, 7 brains) received training with a food omission cue and a control cue unpaired with shock.

Omission cue		Shock cue	Both cues
Group	Medial CeA
O-S	5.59±1.18	8.10±1.56	0.74±0.40
OC-S	2.63±0.60	9.48±2.43	0.55±0.26
O-SC	10.11±1.87	4.35±0.96	0.89±0.34
Group	Lateral CeA
O-S	8.53±1.74	9.13±2.67	1.12±0.36
OC-S	2.44±0.93	10.09±2.15	0.99±0.65
O-SC	7.57±1.27	3.66±1.02	0.55±0.41