Accession Number : AD0772994

Title :   Research on Stadimetric Ranging: Visually Matching the Apparent Size of Objects.

Descriptive Note : Technical rept.,

Corporate Author : HUMAN RESOURCES RESEARCH ORGANIZATION ALEXANDRIA VA

Personal Author(s) : Baldwin,Robert D.

Report Date : NOV 1973

Pagination or Media Count : 33

Abstract : ;HUMRRO-TR-73-27DAHC19-73-C-0004DA-2-Q-062107-A-745*Visual acuity, *Range finding, *Performance(Human), *Antiaircraft gunnery, Target discrimination, Sizes(Dimensions), Test methods, Simulation, Errors, Estimates, Optical equipment, Statistical analysis*Stadimetric ranging, JudgmentFive experimental tasks were devised that simulated a stadimetric ranging task requiring observers to estimate when air defense open- and cease-fire events should occur when engaging inbound and outbound aircraft. The laboratory tasks varied the location of the stadimetric aid with respect to the target's location. The results indicated that accuracy and bias (differential error for inbound and outbound judgments) in the perceptual judgments were affected by the location of the size-judgment aid. Variation in visual acuity was related to perceptual errors for some tasks. (Modified author abstract)

Descriptors :   *VISUAL ACUITY, *RANGE FINDING, *PERFORMANCE(HUMAN), *ANTIAIRCRAFT GUNNERY, TARGET DISCRIMINATION, SIZES(DIMENSIONS), TEST METHODS, SIMULATION, ERRORS, ESTIMATES, OPTICAL EQUIPMENT, STATISTICAL ANALYSIS

Subject Categories : Psychology

Distribution Statement : APPROVED FOR PUBLIC RELEASE