Journal of Mental Science (1958) 104: 466-471. doi: 10.1192/bjp.104.435.466
© 1958 The Royal College of Psychiatrists
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The Spiral After-Effect as a Test of Brain Damage

H. C. Holland and H. R. Beech

Institute of Psychiatry, Maudsley Hospital, London

ABSTRACT

An attempt was made to validate certain previous observations which pointed to a relationship between brain-damage and failure to perceive the negative after-effect of the Archimedes spiral. The results of comparing scores for the duration of after-effect indicated that the length of this period was reduced in brain-damaged subjects, while scores on an all-or-none basis failed to confirm previous findings.

Two possible explanations for the results of this and other studies were put forward. First, individual differences in the degree of cortical inhibition, and differences in the type of brain damage sustained.