Biomedical subjects
Publications and source records attributed to P Arnold.
Six tests of intellectual performance were administered to 25 deaf and 21 hearing adult signers. The two groups were not significantly different on tests of Lip Reading and Reception of Signed English but the hearing subjects were superior on tests of non-verbal reasoning and perceptual speed. The hearing were greatly superior on a test of verbal reasoning.
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An experiment is described in which 26 profoundly deaf children are shown to be superior to 33 hearing children in their ability to rotate mental images of random dots in matrices. This suggests that their poor linguistic skills may be augmented by the use of visual imagery in certain situations.
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In a number of conditions characterised by major disturbance of myocardial contractility (15 cases of thyrotoxicosis, 18 of hypokinetic cardiomyopathy and 9 of hypertrophic cardiomyopathy), the authors have compared the results of measuring the systolic intervals as derived from the quotient PPE/TE with an analysis of the upstroke of the apex electrocardiogram derived from measurement of the t-da/dt interval and from the quotient da/dt/A. The quotient PPE/TE is markedly lowered in the hypokinetic cardiomyopathies. On the other hand this quotient does not differentiate between normal subjects and patients with thyrotoxicosis or hypertrophic cardiomyopathy. By contrast the measurements derived from the electrocardiogram, and especially the quotient da/dt/A, differentiate very clearly between the various pathological conditions.