Accession Number : AD0730283

Title :   Human Estimation of Proportional Distances and Distance Ratios with the Aid of a Reference Length.

Descriptive Note : Final rept. Mar-Nov 68,

Corporate Author : AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Aume,Nilss M.

Report Date : JUN 1971

Pagination or Media Count : 31

Abstract : Two experiments were conducted to investigate human ability to estimate the location of a target point. In the first experiment, a lateral distance between two remote points was displayed, and subjects were required to define, by means of a sighting device, a second lateral distance bearing a prescribed ratio to the first. In the second experiment, subjects were required to estimate the ratio of two displayed distances. Both experiments were conducted on an indoor, table-top range. A reference distance and a ratio aided accuracy in estimating distances. The findings suggest the value of a physically present reference distance for communicating the location of an obscure point. (Author)

Descriptors :   (*TARGET DISCRIMINATION, PERFORMANCE TESTS), (*VISUAL PERCEPTION, OPTIMIZATION), INSTRUMENTATION, TEST EQUIPMENT, TEST METHODS, PERFORMANCE(HUMAN), STATISTICAL ANALYSIS

Subject Categories : Anatomy and Physiology
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE