Accession Number : AD0283412

Title :   THE INFLUENCE OF PRACTICE AND TIME ON TASK ON SENSORY DISCRIMINATION

Corporate Author : LOUISVILLE UNIV KY

Personal Author(s) : LOEB,MICHEL ; HAWKES,GLENN R.

Report Date : NOV 1961

Pagination or Media Count : 1

Abstract : The effect of practice and of time on task on sens ry thresholds was studied. The nature of the mechanism underlying the practice effect for low frequency auditory thresholds was investigated. Results suggest that the effect was due to a sharpening of discrimination with practice between the tone to be discriminated and the background physiologic noise. Vigilance for auditory, electrical cutaneous and vibratory cutaneou signals over an appreciable period of time was also investigated. Detection of faint cutaneous cues is inferior to detection of faint auditory cues and detection for the former signals declines as a function of time on task. Detection of vibratory signals is more efficient than detection of cutaneous electrical signals but less efficient than detection of auditory cues. The increase in response time noted for auditory pure tone low frequency signals with increasing time on task was not noted for auditory faint white noise signals. Moderately intense cutaneous signals can be readily discriminated and detection is maintained, but detection of differences in inten e cutaneous cues is poor and declines wit time. A wider spacing of faint cutaneous cues lends to a greater decline in performance. A tentative explanation was offered in terms of a combined filter an arousal hypothesis involving differential habituation for cutaneous and auditory signals. (Author)

Descriptors :   *HEARING, *SENSES(PHYSIOLOGY), ATTENTION, DETECTION, ELECTRICITY, PITCH DISCRIMINATION, THEORY, TIME, VIBRATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE