Duration of spiral aftereffect as a function of retinal size, retinal place, and hemiretinal transfer.

Freud, Sheldon L.

i

Duration of spiral aftereffect as a function of retinal size, retinal place, and hemiretinal transfer.

1964-01-01
By Freud, Sheldon L.

File Language:

English

Details

Creators:

Freud, Sheldon L.
Corporate Creators:

United States. Office of Aviation Medicine
Subject/TRT Terms:
Publication/ Report Number:

AM 64-9 ; DOT/FAA/AM-64/09
Resource Type:

Journal Article
Geographical Coverage:

United States
Corporate Publisher:

Civil Aerospace Medical Institute
Abstract:

This experiment has shown that, although both rods and cones mediate the spiral aftereffect, cone areas give a larger response. Increasing size of the retinal image results in longer durations of SAE but rods are more affected by this increase than are cones. There is a general weakening in aftereffect resulting from "transfer" from one hemiretina to another with cone areas showing greater loss than rod areas. Size of retinal image has been shown to be a potent variable and, in fact, under some small size conditions, normal Ss fail to observe any effect whatsoever. In view of these findings, it is apparent that size of retinal image is a variable which must be carefully controlled if comparable results are to be obtained. Review of the clinical literature, however, reveals that distance from S to spiral and objective spiral size often vary from experiment to experiment. This variation could well account for some of the differences in results of clinical studies. It is proposed that a standard spiral size and testing distance be introduced for clinical use.
Format:

PDF
Download URL:

https://rosap.ntl.bts.gov/view/dot/20717/dot_20717_DS1.pdf
File Type:

[PDF - 108.46 KB]
Collection(s):

US Transportation Collection ; FAA Civil Aerospace Medical Institute
Main Document Checksum:

urn:sha-512:cdcf3b02a56187b44a31a8e6876985a32f8acf60fef99eeed2b3af386b155b26fe3e5abf8b3e24c0ecf27d7adddf522d74bb96121a96bc2dc95df2c26d461e6d

File Language:

English

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