Abnormal contextual modulation of visual contour detection in patients with schizophrenia.

Patients performed significantly worse than controls and relatives in the Random condition (Tukey’s HSD, p values < 0.01, Cohen’s d = 1.12), significantly worse than relatives in the Orthogonal condition (Tukey’s HSD, p = 0.041, Cohen’s d = 0.68), and showed a trend toward poorer Orthogonal performance versus controls that did not survive correction for multiple comparisons (uncorrected p = 0.006, Cohen’s d = 0.50).

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