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Studied the nature of dysfunction in the selective attention of schizophrenics. 12 schizophrenics and 12 alcoholic controls were tested in dichotic listening in a 2* 4 (Groups* Conditions) repeated-measures design. Schizophrenics made significantly more omission-type errors than alcoholic controls with a fast rate of presentation but not with a slow rate. In the latter case, when they were asked to listen to the distractor words during shadowing, schizophrenics were more susceptible than controls to interpenetration-type errors. Considered together with findings in tests of memory, results implicate speed and filtering efficiency as the most important determinants of schizophrenic performance. The filtering inefficiency appears to be centered at some stage or stages beyond the sensory input.(22 ref)(PsycINFO Database Record (c) 2016 APA, all rights reserved)