English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Visual contrast is a psychologically remarkable phenomenon , but it is difficult to account for this phenomenon in physiological terms, because there was no method available to measure the physiological process under lying it. Motokawa1) showed that the color-effect manifests itself in the temporal pattern of electrical excitability of the retina following illumina tion. Utilizing this method, Motokawa2) succeeded in exploring a retinal process to be correlated with the visual contrast and designated it retinal induction. There are two kinds of retinal induction, that is, direct and indirect retinal induction. The former represents a correlate of suc cessive contrast, and the latter a correlate of simultaneous contrast. Both phenomena are in character complementary to each other. They remain unaltered for a periode of about 20 seconds after removal of the inducing light, and then decrease gradually to disappear in 30-40 seconds. This phenomenon was found not only in the human eyes, but also, in animal retinas,3),4) and further it was shown that the retinal induction is caused not only by colored light, but also by intermittent white light,5) by al ternating currents6) and by direct currents of various forms.'' The capaci ty to produce retinal induction is different from part to part in the retina. As to the regional difference of direct induction some experiments were made by Kurosawa and Katayama.s) In the present experiment a sys tematic survey on the spatial distribution of indirect induction was undertaken with special reference to the blind spot.

Indirect Retinal Induction in Various Regions of the Human Retina