J T Sappington

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Anomalous cerebral dominance can have multiple manifestations, e.g., left-eye preference or left-foot preference in the absence of left handedness per se. The 1987 estimate of prevalence of anomalous dominance in the population by Geschwind and Behan approaches 30%, three times the estimate obtained by using handedness alone as the sorting criterion.(More)
Separate bodies of research suggest that performance in spatial reasoning covaries with gender and with gender role. Typically studies employ a spatial task whose variance is then used to account for differences in scores between gender groups or variance in a measure of gender role. A methodological issue in such research is that the tasks used to(More)
Interpreting gestures from retarded, nonvocal subjects is scientifically risky. Investigators must construe the subject's meaning without reference to an external validity measure. A procedure was devised in which message content was provided to nonvocal, severely palsied quadriplegic subjects in advance. Subjects' responses were limited to yes/no gestures.(More)
The lateral eye movements of a moderately mentally retarded adult with exceptional ability in a perpetual calendar task were examined. Questions with a perpetual calendar, mathematical, or musical and spatial content were presented to the subject in a random order and lateral eye movements were rated by blind observers. Results showed that both the(More)
The concept of cerebral dominance has attracted recent attention as a dimension in human cognition and psychopathology. Questions have been raised about the validity of the construct and the adequacy of instruments commonly used to assess it. The present study measured the test-retest reliabilities and interrelationships of four commonly used behavioral(More)
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