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Biomedical subjects

W H Seaton

Publications and source records attributed to W H Seaton.

10 recordsLinked to original sources
PubMed1982

DSH abstract: coverage of the world communicative disorders literature.

The percentage of journal articles covered by dsh Abstracts and the time it took these articles to appear as abstracts in this secondary publication were analyzed. Articles were obtained from nineteen communicative disorders journals every other year for the years from 1968 to 1976. Then the author index of dsh Abstracts was searched each year for up to five years following journal publication to determine whether each article was included in this abstracting service's coverage of the world literature. Of the 5548 articles included in the study, 3270 (59%) were covered by this abstracting service within a mean time of 9 months; however, time lag and coverage varied considerably for individual journals on a year by year basis. It was concluded that for historical searches and current awareness needs this secondary publication may not be meeting the information needs of communicative disorders specialists.

Abstracting and Indexing↗
PubMed1979

Level dependence of critical bandwidth: notched-noise masking paradigm.

The effect of increased stimulus level on critical bandwidth was investigated. Noise-masked, pulsed-tone thresholds were obtained by a Bekesy tracking procedure from 4 practiced normal-hearing adults at .5, 1, 2, and 4 kc/s. Tones were placed symmetrically within a band-reject region. Critical bandwidth was taken as the frequency separation between noise bands at which masked tonal threshold began to change and was found to increase fairly regularly as the spectrum level of the noise increased from 30-60 db SPL. However, the data at 60 db SPL may have been influenced a 2 and 4 kc/s by the detection of aural distortion products. The suggestion was made that when signal frequency is outside the spectral limits of the masker, critical bandwidth widens as masker level is raised; however, when signal frequency is within the spectral limits of the masker (as with a continuous noise wit no notches), critical bandwidth remains unchanged up to 80 bd SPL.

Adult↗