Reduced visual contrast suppression during major depressive episodes.

We observed no differences between patients and controls in the brightness induction test ( t 39.8 = 0.534, p = 0.60, d = 0.115; Figure 2A ), but we did observe a highly significant difference between groups in the contrast suppression test ( t 35.2 = 2.902, p = 0.006, d = 0.663; Figure 2B ).

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