Fig. 2.

Grand-averaged difference waveforms (‘anomalous’ minus ‘best-fit’) for schizophrenics (n = 12, continuous lines) and normal controls (n= 12, dashed lines). In normal controls, increased negativity (N400) was apparent in the 300–500 ms range, but is negligible for schizophrenics. Normal controls showed increased positivity (late positive component) in the 600–300 ms range; schizophrenics showed virtually no positivity in this time range. Arrows (at Cz and Pz) indicate the approximate position of the mean N400 peak component latencies for both schizophrenic patients and normal controls. Group latency differences were statistically significant.