“The common clinical observation of impaired ‘reality contact’ in schizophrenia implies a deficit in the intensity or direction of responsiveness to social cues . . . specifically those involved in verbal interactions . . ‥ [Therefore] it may be predicted that the reinforcing function of listener reactions (i.e., verbal reinforcement) will be negligible for them as compared with nonschizophrenic control Ss . . ‥ The . . . results [of this experiment] confirm the hypothesis . . ‥” (PsycINFO Database Record (c) 2006 APA, all rights reserved)