Abstract: 1. Simple reactions of schizophrenics of paranoid type with different clinical pictures, to sound stimuli of two intensities were slower than that of normal persons. Among these patients, those with active symptoms made the slowest reaction, the unstable ones came next, and the reaction time of the remissive patients was the shortest.2. Schizophrenics of the paranoid type showed 3 kinds of characteristics in simple reaction: (1) Short reaction time with obvious regularity in accordance with intensity of the stimulus. This might be the indication that the general disturbance of cerebral function was not severe. These were mostly patients in remission; (2) Short reaction time with no obvious regularity in accordance with intensity of the stimulus. This was evidently an indication of cerebral functional disturbance in an equalization phase and a paradoxical phase; (3) Long reaction time. This indicated serious functional disturbance of the narcotic phase. Patients with active and unstable symptoms belonged to this group.3. After talking about matters related to paranoid delusions, or after performing a complex discrimination reaction test, the cerebral functional disturbance in most of the patients became more severe in various extents.

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