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. Author manuscript; available in PMC: 2007 Sep 1.
Published in final edited form as: Learn Mem. 2006;13(5):590–598. doi: 10.1101/lm.301206

Figure 3.

Figure 3

Post-training antagonism of opioid receptors alters the pattern of learning-induced Fos protein expression. Opioid receptor antagonism prevented the increase of Fos expression in the anterior piriform cortex and produced a significant increase of Fos expression in the central nucleus of the amygdala. Bars represent the number (mean ± SEM) of Fos-positive cells counted bilaterally in each brain area for subjects receiving paired presentations of odor–shock (SAL, n = 4; NTX, n = 4–6), or control presentations (SAL, n = 5–6; NTX, n = 6–7). SAL indicates saline; NTX, naltrexone; GCL, granule cell layer of olfactory bulb; ant or post PIR, anterior or posterior piriform cortex; and BLA/LA or CeA, basolateral/lateral or central nucleus of the amygdaloid complex. *P < 0.05.