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Orientation acuities for CW/ACW judgments with respect to vertical for four observers. Dotted and dashed lines reflect acuities for white and green targets, respectively, without distractors. Different columns reflect different conditions, e.g. “W/G” indicates a green target and white distractors. Each column summarises a minimum of 360 trials. Error bars contain 95% confidence intervals. Acuity was worst when target and distractors shared the same colour.
