The Spiral After-Effect As a Test of Brain Damage

Abstract

A number of studies have been recently concerned with the clinical application of the Archimedes spiral, an illusory negative after-effect of apparent movement, which requires no description here. Freeman and Josey (3) reported a relationship between the presence or absence of this after-effect and a clinical judgment of memory function, while a cross-validation study by Standlee (11) failed to confirm this observation when an objective measure of memory impairment was used.