Abstract
The roles of different forebrain structures in stages of memory formation were investigated by injecting agents into either the left medial hyperstriatum ventrale (MHV) or right lateral neostriatum (LNS) close to the time of one-trial taste-avoidance training. With L-glutamate injected into either the left MHV or right LNS 5 minutes pretraining, retention was good 1 minute posttraining but significantly impaired at 5 minutes and each subsequent time point. With emetine injected into either area, retention was still good 60 minutes posttraining but significantly impaired at 90 minutes. With ouabain, retention declined more slowly following injection into the right LNS (at 45 minutes) compared to injection in the left MHV (at 30 minutes). A second experiment confirmed the regional difference in amnesia development produced by ouabain. These results indicate that the duration of short-term memory is longer following inhibition of intermediate-term memory (ITM) in the right LNS, compared to inhibition of ITM in the left MHV.
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