Fixation and response latency to “short” and “long” levers on generalization trials.

<p>Upper panels present latency to attain a 100 msec fixation on trials where subjects later responded to the 200 (A) or 800 (B) msec keys; lower panels present latency to emit categorization response of stimulus duration by responding to the 200 (C) or 800 (D) msec key. The performance of subjects (N = 15) of the CNTR group is represented by open circles while closed circles represent the performance of subjects (N = 15) of the PRPH group; the group that used BOTH is presented with red triangles. Only symbols at intervals close to or at the extreme durations present mean of 15 subjects since some subjects never emitted erroneous categorizations (e.g. response to 200 msec key after an 800 or larger than 400 msec stimulus). Stars and horizontal bars indicate significant differences between denoted groups after two-way ANOVA followed by Bonferroni´s test (p<0.05) (see text); only data from anchor intervals with N = 15 were included in statistical analysis.