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Biomedical subjects

W J Gunn

Publications and source records attributed to W J Gunn.

25 records · Page 2Linked to original sources
PubMed1978

Annoyance response to recorded aircraft noise. I. Effect of intensity of illumination.

Normal-hearing adults aged 19--49 yrs watched TV in a simulated living room and made magnitude estimations of the annoyance of each of 27 levels of noise from 83.9 to 91.8 dbA. Each item was a simulated flyover of an aircraft presented from 4 loudspeakers each outside one of the upper corners of the room. The 27 items were all presented in each of 3 sessions (counterbalanced across groups of 4 S) under room illumination of 21.53 lumens/sg m (i.e., "normal" room illumination), and 2.69 ("dim") and 129.17 ("bright") illumination. Split-half reliabilities indicated that Ss can make reliable responses in these conditions. The intercept of the regression lines of annoyance on noise levels significantly differed, and the slopes tended to differ, among the illumination conditions; indicating that the annoyance may grow more rapidly with increasing noise level under dim than normal illumination. Data predicted that annoyance reduction, which may be equivalent to 5 db attenuation, is obtained when normal illumination is reduced to dim. Similarly, judged annoyance tended to differ between bright and normal illumination.

Adult↗
PubMed1977

Annoyance response to spectrally modified recorded aircraft noise during television-viewing.

Magnitude estimations of the annoyance of 27 individual noise stimuli were made by 24 Ss while viewing television; 8 different spectrum modifications of a basic aircraft noise were introduced at 3 overall intensities. The basic spectrum was that of an untreated commercial jet aircraft takeoff noise; the other 8 were created by removal of one of two amounts of energy from an octave band centerered at either .315, .8, 1.6, or 4 kc/s. An ANOVA showed significant annoyance differences for spectrum modification, overall noise intensity and their interaction. Annoyance reduction was greatest when energy was removed at the octave band centered at 1.6 kc/s, next at .8, and .315, and least at 4 kc/s. Although greater overall intensity reduction yielded progressively less annoyance with various spectrally-modified noises as well as unmodified noise, the spectrum modification was apparently most effective in reducing annoyance when the overall maximum noise intensity ranged from 88.0 to 89.1 dbA, and was least effective from 83.9 to 85.3 dbA. Annoyance reduction resulting from spectrum modification at a single octave band (centered at either .8 or 1.6 kc/s) was equivalent to that resulting from a 2.7 dbA overall intensity reduction. The results are discussed in terms of speech interference as well as intermodal effects of noise during television viewing.

Adult↗
PubMedDate not supplied

Pneumococcal vaccination practices among private physicians.

It is estimated that less than 10 percent of patients thought to be at high risk of invasive pneumococcal diseases have received 14-valent pneumococcal polysaccharide vaccine. To determine if any of these groups are more likely to be vaccinated than others, 893 private, primary-care physicians were surveyed nationwide. Although there was general agreement that the vaccine is indicated for the high-risk groups, patients with cardiorespiratory diseases were the only ones usually immunized by more than half of the survey respondents. The discrepancy between attitudes and practices could not be attributed to any specific factor.

Aged↗