Skip to main content
. Author manuscript; available in PMC: 2010 May 5.
Published in final edited form as: Schizophr Res. 1993 Oct;10(3):247–257. doi: 10.1016/0920-9964(93)90059-r

Fig. 4.

Fig. 4

Topographic distribution of late positive component (600–800 ms) and Mann-Whitney Z-SPM. Left and middle panels: Voltage maps show that normal controls produced a relatively symmetrical pattern of positivity (lighter greys equal greater positivity), with a posterior maximum at the central midline (lightest grey). By contrast, schizophrenics showed their greatest positivity over left occipital scalp. Grey-coded voltages are scaled differently for schizophrenics and normal controls to make scalp distributions clearly visible. Voltage scale maxima and minima are the following: normal controls = 4.5 to 0.0 μV; schizophrenics = +0.5 to –2.0 μV. Right panel, SPM: scale maxima and minima were the following: Z= +4.0 to 0.0. The largest Z-values were in the left temporal scalp region (T3, TCPl, C3, Cz), with Z-values ranging from 3.61 to 3.90. The Z-values of neighboring electrode sites ranged from 0.92 to 3.70.