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By Charles M. Gaitz M.D. (auth.), Charles M. Gaitz (eds.)

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Extra info for Aging and the Brain: The Proceedings of the Fifth Annual Symposium held at the Texas Research Institute of Mental Sciences in Houston, October 1971

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The latter, however, present very easy tasks for normal subjects and this circumstance precludes disclosing any possible relationships with age for these types of performance. For example, 90 of 100 control patients made perfect performances on the three-dimensional block construction task. On the other hand, a modification of the task in which the patient was required to make his constructions on the basis of photographs instead of actual block models resulted in a systematically lower level of performance with only 35 percent making perfect scores.

Arch. Neurol. 1:357. F. 1971. Sensory processes and age effects in normal adults. J. Geront. 26:90. W. 1970. Apraxia in relation to hemispheric locus of lesion and aphasia. Trans. Amer. Neurol. Assoc. 95: 147. ; and Spinnler, H. 1968. The performance of patients with unilateral brain damage on face recognition tasks. Cortex 4:17. , and Spinnler, H. 1966. Facial recognition in brain-damaged patients. Neurology 16: 145. Fisher, M. 1956. Left hemiplegia and motor impersistence. J. Nerv. Ment. Dis.

It is in the field of visuoperceptive and visuoconstructive performances that most of the work concerned with the functional properties of the right hemisphere has been done. Some representative studies will be described to show what the outcome of this work has been. Meier and French (1965) studied visual discrimination in patients who had undergone resection of either the right or the left temporal lobe for psychomotor seizures, the two groups having been equated for age and WAIS IQ. The task assessed the ability to discriminate between circular patterns on the basis of either rotational or structural cues (Figure 1).

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