Abnormal and subnormal rigidity

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To analyze rigidity or perseveration, four experiments were conducted with 18 pairs of mentally retarded and brain-injured children, matched for MA and IQ. In reproducing tone rhythms, pictures, dot patterns, and words the brain-injured children showed more delayed and repetitive perseverations than did the endogenous retarded children. Results of two experiments indicate that endogenous (subnormal) rigidity involves failure to differentiate within coarse groupings, whereas the brain-injured perseveration is disintegrative or abnormal, with elements remaining isolated or ungrouped. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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