It has repeatedly been demonstrated that both acutely psychotic and remitted schizophrenics, as well as some relatives of schizophrenics, show experimentally assessable cognitive dysfunctions, i.e. attentional or information-processing deficits. It is therefore assumed that these are at least potential vulnerability indicators for schizophrenia (Nuechterlein & Dawson, 1984; Nuechterlein, 1987).