Figure 1.

The mean (n= 8; ± SEM) performance on the vsPAL task following acute challenge with doses of 4-methylmethcathinone. The percentage of trials correctly performed on the initial attempt (upper left) and after a maximum of six attempts (upper right), as well as the % task completed (lower left) and choice latency (lower right) data, are presented. Shaded symbols represent significant differences from the vehicle condition within a trial type. The open symbols for overall attempts depict significant differences from both the vehicle condition (overall attempts) and the corresponding initial-attempt score for the overall-attempt measure. Significant differences from the 1-stimulus trials within a treatment condition are indicated by # and from the 4-stimulus trials by *.