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. Author manuscript; available in PMC: 2009 Jul 13.
Published in final edited form as: Psychophysiology. 1994 Jan;31(1):29–36. doi: 10.1111/j.1469-8986.1994.tb01022.x

Table 1.

Behavioral and Performance Measures for Schizophrenics and Controls

Conditions
Group Loud, far Loud, near Soft, far Soft, near
Perceptual sensitivitya
  Control
    A′ 0.996 (0.002) 0.972 (0.029) 0.940 (0.056) 0.867 (0.107)
    B′ 0.459 (0.469) 0.699 (0.310) 0.793 (0.150) 0.739 (0.216)
  Schizophrenic
    A′ 0.969 (0.056) 0.869 (0.125) 0.896 (0.147) 0.800 (0.242)
    B′ 0.621 (0.496) 0.595 (0.324) 0.503 (0.594) 0.390 (0.565)
Reaction time (ms)
  Control 0.394 (0.055) 0.470 (0.052) 0.488 (0.089) 0.534 (0.085)
  Schizophrenic 0.570 (0.129) 0.631 (0.137) 0.622 (0.138) 0.624 (0.128)
Peak P3 latency at Pz (ms)
  Control 335.72 (27.97) 394.38 (39.60) 385.16 (37.04) 448.37 (78.09)
  Schizophrenic 349.65 (58.76) 454.25 (96.98) 417.38 (85.13) 431.46 (57.52)

Note: Values are mean (standard deviation).

a

A′ = nonparametric measure of sensitivity; 0.5 = chance performance, 1.0 = perfect descrimination. B′ = nonparametric measure of response bias; negative values indicate liberal bias, positive values indicate conservative bias.