Accession Number : AD0665293

Title :   PERCEIVED DEPTH BETWEEN FAMILIAR OBJECTS,

Corporate Author : CIVIL AEROMEDICAL INST OKLAHOMA CITY OKLA

Personal Author(s) : Gogel,Walter C. ; Mertens,Henry W.

Report Date : AUG 1967

Pagination or Media Count : 11

Abstract : In aviation, size cues are frequently used in a pilot's evaluation of depth or distance. In the study, the hypothesis was examined that the essential factor in the size cue to depth from familiar objects is the perceived size S' per unit of retinal size theta of each of the objects, with the object having the largest value of S'/theta appearing to be the more distant object. Five familiar objects (a box of cough drops, a half dollar, a tape dispenser, a door key, and a tube of toothpaste) were simulated. The objects were presented in pairs and the Os indicated their perceived width (S'), the perceived distance (D') of each from himself, and the perceived depth (d') between the objects in each pair. In agreement with the above hypothesis, the results indicate that the perceived depth between the objects was a monotonic function of the difference between the values of S'/theta. The average values of d' and D' were similar to the simulated values for distances up to approximately three feet from the observer. For greater distances the error in the average d' and D' values increased with an increase in the simulated distances. The study supports the notion that the familiar size cue to depth can occur between objects of dissimilar shape whenever these objects have perceived sizes. The concept of S'/theta as the significant factor in the familiar size cue to depth permits this cue system to be of significance in a wide variety of naturally occurring situations. (Author)

Descriptors :   (*SPACE PERCEPTION, PILOTS), VISION, AVIATION MEDICINE, RETINA, GEOMETRIC FORMS, CORRELATION TECHNIQUES

Subject Categories : Psychology
      Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE