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Biomedical subjects

J R Antes

Publications and source records attributed to J R Antes.

12 recordsLinked to original sources
PubMed1993

Effects of capacity demands on picture viewing.

Effects of cognitive-resource demands on picture-viewing patterns were investigated. The eye fixations of 72 subjects were recorded as the subjects viewed pictures and concurrently performed one of three listening tasks. Half of the subjects were asked to remember certain objects from the pictures and half had no-memory instructions. Concurrent auditory monitoring increased interfixation distances and the frequency of fixations on regions of high informativeness, and decreased the area of the pictures explored and the memory for objects in the scenes. It is suggested that the demands on cognitive resources influenced subjects' ability to encode and integrate fixated information and therefore prolonged the normal first phase of viewing, described by Buswell (1935).

Acoustic Stimulation↗
PubMed1983

Hydrocortisone reduces auditory sensitivity at high tonal frequencies in adult males.

The present study was designed to investigate the effects of treatment with cortisol on auditory tonal detection. College males were given either 20 mg of hydrocortisone or a placebo (dextrose) in a double blind design. Thereafter, thresholds were determined for frequencies of 500, 1,000 and 4,000 Hz using the method of limits. These results were then converted to change scores by using thresholds obtained for the same subjects at the same frequencies prior to treatment. Planned comparisons indicated that treatment with cortisol reduced sensitivity at 4,000 Hz but had no effects at other frequencies. Also, an overall analysis of variance indicated greater right ear improvement and greater improvement at lower frequencies. These findings are explained as resulting from the ability of glucocorticoids to alter cellular metabolism or reduce levels of adrenocorticotropic hormone.

Adolescent↗
PubMed1977

Analysis of processing demands in partial report.

Processing demands in the Sperling (1960) whole- and partial-report tasks were evaluated with the simple reaction-time probe procedure. 6 subjects responded to a buzzer probe presented at various temporal locations in the processing interval associated with performance in whole or partial report. The results showed relative increases in processing demands in partial report in the temporal vicinity (+/- 200 msec.) of the delivery of the auditory indicator cue as indicated by increases in probe reaction-time. Furthermore, reacting to the probe during this interval interfered with partial-report performance. This mutual interference was not detected when whole report was performed concurrently with the probe task. The results were interpreted in terms of an analysis of central processing capacity.

Acoustic Stimulation↗
PubMed1975

Multidimensional scaling of pictorial informativeness.

The dimensions used in the judgment of the informativeness of picture sections were investigated by means of a recently proposed methodology, multidimensional similarity analysis. 10 judges (college students) rated the informational similarity of 32 areas within a single picture. The five extracted dimensions accounted for 86% of the judgmental variance and were all readily interpretable. These dimensions were discussed with respect to an earlier study in which eye movements of subjects viewing this picture were recorded.

Adult↗