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- W2443595748 abstract "In order to expand the body of information concerning auditory function in the presence of the generalized cortical dysfunction associated with severe mental retardation, the discrimination of periodicity pitch signals by nonverbal severely retarded children and adults of normal intelligence was examined using an operant conditioning adaptation of the psychophysical method of constant stimulus differences. The periodicity pitch difference limens (DLs) based on changes in repetition rate were compared with frequency DLs obtained from low (150 Hz) and high frequency (2200 Hz) sinusoids. Periodicity pitch signals were generated by gating a 2200-Hz sinusoid over a range from 141 to 159 pulses per sec and passing the signals through a narrow band-pass filter to ensure no low frequency energy was present. The DLs (75% correct discriminations) were computed from the three types of discrimination performance curves. Standard errors of the means were small and retarded subjects showed good test-retest reliability. The results indicated that the simple and complex pitch discrimination abilities for both normal and retarded subjects were similar." @default.
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- W2443595748 date "1977-01-01" @default.
- W2443595748 modified "2023-09-23" @default.
- W2443595748 title "Periodicity pitch perception of retarded children." @default.
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