Accession Number : ADA112837

Title :   Lateral Spreading of Visual Adaptation,

Corporate Author : ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL

Personal Author(s) : Holly,Franklin F

PDF Url : ADA112837

Report Date : 02 Mar 1982

Pagination or Media Count : 8

Abstract : Most previous studies of dark adaptation have first light-adapted a portion of the retina and then determined the subsequent course of sensitivity changes (threshold changes) within the area just adapted. In the operational environment, however, adapting sources and target lights seldom occur in such an orderly fashion; we are interested in knowing the sensitivity changes produced not only within an adapting source but also outside of it. This report concludes that: (1) With no moonlight field, under the stimuli configuration used in this experiment a large proportion of the sensitivity changes outside of the adaptation field can be accounted for by assuming a stray light background approximately 1 log unit less intense than the adaptation field; (2) The failure to achieve complete congruence of the Point 1 and Point 2 curves, however, indicates that the sensitivity changes outside of the adaptation field cannot be completely accounted for by stray light; and (3) The addition of the moonlight field causes a curious reversal.

Descriptors :   *Dark adaptation, Sensitivity, Light, Targets, Retina

Subject Categories : Psychology
      Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE