A normal and various subclassified schizophrenic groups (ns = 10) were compared on two-flash threshold by a brief double staircase method and by an extensive yes-no procedure with signal-detection analytic techniques. For all groups the two techniques correlated moderately. Contrary to predictions made by Venables' arousal theory, the data obtained from the yes-no procedure showed that these schizophrenic groups performed similarly and at a lower sensitivity than the normal group.
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