Accession Number : AD0437334

Title :   THE EFFECT ON THE LEVEL OF VIGILANCE OF AN ADJACENT SECONDARY VIGILANCE TASK,

Corporate Author : HUMAN FACTORS RESEARCH INC LOS ANGELES CALIF

Personal Author(s) : O'HANLON,J. ',Jr. ; Schmidt,E. A.

Report Date : APR 1964

Pagination or Media Count : 27

Abstract : The purpose of this study was to determine whether performance of a main visual vigilance task could be enhanced by presenting observers with knowledge concerning their performance of an adjacent and concurrent secondary visual vigilance task. Observers were instructed that adequate or inadequate performance of the secondary task, as give by a form of knowledge of results, connoted the adequacy of their performance of the main task. It was concluded that performance of a main visual vigilance task is impaired by the presence of an adjacent visual vigilance display on which occasional 'secondary' signals are presented. This is true regardless of whether instructions indicate that secondary signals are to be responded to (with knowledge of results to signals on the main task), or ignored. (Author)

Descriptors :   (*VISUAL PERCEPTION, PERFORMANCE(HUMAN)), (*ATTENTION, JOB ANALYSIS), VISUAL SIGNALS, ERRORS, ACUITY, DISPLAY SYSTEMS, EXPERIMENTAL DATA, TABLES(DATA)

Distribution Statement : APPROVED FOR PUBLIC RELEASE