Reaction times during recognition memory. Group mean reaction times and standard deviations of recognition memory judgments exhibited during neuroimaging to stimulus items with different encoding histories. Encoding occurred prior to imaging and was prompted by three conditions (1) GO stimulus items: pressing a button to earn money under one set of stimuli; (2) NO-GO stimulus items: inhibiting button pressing under a second set of stimuli; and (3) Instructed stimulus items: memorizing a third set of stimuli as prompted by verbal instructions. The item labeled "NEW" was an asterisk presented during neuroimaging that prompted a button press and functioned as the baseline condition for assessing activation correlated with the onsets of encoded stimulus items (i.e., OLD > NEW contrasts). Significant differences in reaction times were observed between GO and NO-GO conditions and GO and Instructed conditions.