Another application of the spiral aftereffect in the determination of brain damage.

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Abstract
"Significant differences were obtained between a group of patients suffering cortical brain damage and a matched group of patients with a functional diagnosis in the perception of a negative spiral figural aftereffect. Organic patients were less likely to report the effect. The results were interpreted as providing additional support to the theoretical implications of this measurement, but as providing less evidence that the aftereffect may serve as an effective diagnostic device.".