RT Journal Article
SR Electronic
T1 Visual field rehabilitation in the cortically blind?
JF Journal of Neurology, Neurosurgery & Psychiatry
JO J Neurol Neurosurg Psychiatry
FD BMJ Publishing Group Ltd
SP 1113
OP 1124
DO 10.1136/jnnp.48.11.1113
VO 48
IS 11
A1 R Balliet
A1 K M Blood
A1 P Bach-y-Rita
YR 1985
UL http://jnnp.bmj.com/content/48/11/1113.abstract
AB Investigators have recently reported that specific practice facilitates the restitution of visual fields in partially blinded humans with lesions to the striate cortex. In order to further evaluate this work, attempts were made to retrain twelve homonymous hemianopic or quadrantanopic patients with similar methods, but under conditions in which possible contaminating experimental variables were controlled, including: reliance on gross subjective impressions, large visual stimuli response variability, changes in detection strategies with practice and compensatory eccentric fixation. The results indicate that visual field increases are not trainable. It is concluded that previous studies should be regarded with caution and the restitution of visual fields after damage to the striate cortex in humans is probably not possible with existing methods.