Several types of amygdala-dependent learning can be blocked
by local infusion of NMDA antagonists into the amygdala. This blockade
shows anatomical, pharmacological, temporal, and behavioral
specificity, providing a pattern of data more consistent with a role
for NMDA receptors in learning than in arousal or attention, and
supporting the contention that an “LTP-like” process
is a neural substrate for memory formation.