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. Author manuscript; available in PMC: 2012 Jan 1.
Published in final edited form as: J Psychophysiol. 2011;25(2):60–66. doi: 10.1027/0269-8803/a000042

Table 1.

Attentional influences in S1, S2 amplitudes for P50, N100, P200 and gating ratios.

Mean amplitudes and standard deviations for P50, N100, P200 responses (to both S1 and S2 stimuli in the paired-click paradigm) and gating ratios in schizophrenia patients (N=12) and healthy controls (N=15) under three different attention conditions.

Healthy Schizophrenia
Task Measures passive auditory attention visual attention passive auditory attention visual attention
P50 S1 amplitude (μV) 3.35 (2.36) 4.27 (2.39) 3.83 (2.24) 2.51 (1.40) 3.64 (2.30) 2.78 (2.32)
P50 S2 amplitude (μV) 1.82 (1.83) 2.49 (2.03) 2.55 (2.86) 2.25 (2.03) 1.78 (1.52) 2.00 (1.26)
P50 ratio (S2/S1 × 100) 62.80 (50.47) 59.13 (25.1) 64.96 (50.24) 88.21 (47.05) 70.76 (67.61) 99.55 (65.28)
N100 S1 amplitude (μV) 12.38 (5.93) 12.18 (6.41) 12.39 (5.66) 8.49 * (3.14) 8.48 (3.15) 6.71 ** (3.91)
N100 S2 amplitude (μV) 6.28 (4.39) 6.65 (3.31) 6.13 (3.99) 3.48 (1.21) 4.84 (2.73) 4.81 (1.70)
N100 ratio (S2/S1 × 100) 43.12 (17.87) 59.80 (29.87) 49.39 (16.95) 44.76 (18.28) 62.86 (43.76) 89.06 * (54.25)
P200 S1 amplitude (μV) 19.38 (10.46) 17.93 (8.89) 18.43 (11.76) 13.42 * (4.70) 12.79 (4.46) 11.02 (4.31)
P200 S2 amplitude (μV) 8.71 (4.47) 11.85 (4.90) 7.94 (4.93) 6.67 (2.15) 9.25 (3.52) 6.56 (1.82)
P200 ratio (S2/S1 × 100) 46.72 (14.56) 69.99 (19.82) 48.58 (20.13) 53.52 (19.25) 76.55 (31.39) 69.62 (38.93)
*

p<0.05,

**

p<0.01 (independent samples t-tests between groups)