Averaged evoked responses and psychometric intelligence.
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Adolescent↗
Biomedical subjects
D E Hendrickson
Publications and source records attributed to D E Hendrickson.
Psychological test performance and sedation thresholds of elderly dements, depressives and depressives with incipient brain change.
As expected, dements, depressives and patients with a mixed psychopathology were differentiated from one another on the sedation threshold measure and on a number of psychological tests. In depressives responding to treatment significant changes in physiological and psychological measures, which had been reported in an earlier study could not be replicated except for an increase of psychomotor speed. In the present sample of patients there were significant correlations between various psychological measures and between them and the levels of the sedation threshold, suggesting that sedation thresholds and psychological tests measured related cerebral functions. Evidence obtained from the earlier investigations to the effect that cerebral age changes short of those occurring in dementia may facilitate the occurrence of depression in late life was only weakly confirmed by the replication study.
Aged↗
An auditory illusion predicted by a theory of brain function.
A theory of brain function has resulted in the hypothesis that dichotic auditory stimuli of differing intensities would be subjectvely heard to occur at different times if presented together. The louder of the two tones would always be heard first. The results of an experiment designed to test the hypothesis have established that the predicted illusory judgment will invariably be made. The further prediction that the magnitude of the effect would closely parallel certain reaction time data was substantiated. It seems reasonable to conclude that the same paradigm must underlie both sets of data. The theory and obtained results provide a possible neurophysiological basis for the perception of rhythm. A review of the literature has shown that results analogous to those reported here have previously been reported for the visual and tactile modalities, as would be predicted from the general considerations of the theory which gave rise to the specific hypotheses tested in this experiment.
Acoustic Stimulation↗