The role of rat dorsomedial prefrontal cortex in working memory for egocentric responses.

The present experiment studied the effects of quinolinic acid (90 mM) lesions of the medial precentral and anterior cingulate on working memory for egocentric responses. Rats were trained on a delayed match-to-sample task that involved memory for a 90 degrees right or left turn. The results indicated that lesioned rats had significantly decreased scores during the 10 s delay condition compared to presurgery levels. An increase in the delay to 20 s significantly reduced working memory performance in the lesioned rats compared to that of controls. These findings suggest that the rat medial precentral and/or anterior cingulate area play an important role in working memory for egocentric responses.