Accession Number : AD0284459

Title :   DURATION AS A MEASURE OF THE SPIRAL AFTER EFFECT

Corporate Author : AIR FORCE HOSPITAL ANDREWS AFB WASHINGTON D C

Personal Author(s) : FREUD,SHELDON L.

Report Date : 26 SEP 1962

Pagination or Media Count : 1

Abstract : I DENTIFI RS: Spiral aftereffect. It is demonstr ted that duration of the spiral f ereff c (S i a r liable m sur . C ORREL IO COEFFICIE S FOR !%, ) AND > ECOND FIXATION PERIODS ARE SIGNIFICANT. Ev n naive subjects experienc d o ifficul y in consi e tly reporti g ter i tion of the effect Such high reliability with naive subjects indicates that duration of the SAE s ould be a very useful measure for both experimen al and applied purpose . In addi ion, the or erly progre sion of SAE uratio with increasing fix tio time furt r adds to the confidence that duration is a stable measure. T HE OBSERVED RELATIONSHIP BETWEEN SAE DUR TION AND FIXATION TIME SUGGESTS THAT A RELATIVELY SHORT E POSURE IS SUFFICIENT TO PRODUCE A SUBSTANTI L AFTEREFFECT. On t basis of these results, 15 s conds woul appear to be an optimal fixation period. Thi dura ion has the dv ntage over the s andard 30 s conds used in clinical practice in that it reduces both fatigue and testing ti . (Author)

Descriptors :   *AFTERIMAGES, DETERMINATION, HELIXES, INTENSITY, RELIABILITY, ROTATION, STIMULATION(PHYSIOLOGY), TEST METHODS, TIME

Distribution Statement : APPROVED FOR PUBLIC RELEASE