Biomaterial Database

[Chromatic adaptation produces opposite effects on the on and off responses of the photopic electroretinogram (author's transl)]. 1977

H J Langhof

The electrical response of the light adapted human eye to onset (a-wave) and offset (d1-wave of the positive off-effect) of monochromatic test stimuli between 448 and 654 nm (Ganzfeld stimulation, duration of test flash 0.3 s) was recorded by means of the electroretinogram in 10 normal observers during steady illumination of various wavelengths of 2.2 log Troland. During exposure to white light the spectral sensitivity of the a-wave and off-effect as determined by a criterion amplitude of 25 micronV were similar, the sensitivity of the off-effect being 0.4 log units lower as compared to the a-wave. Blue adaptation (467 nm) decreased the sensitivity of the a-wave and increased the sensitivity of the off-effect within the short wavelengths region of the spectrum. Red adaptation (630 nm) decreased the sensitivity of the a-wave and increased the sensitivity of the off-effect within longer wavelengths. Green adaptation (530 nm) produced only a small decrease of sensitivity of the a-wave for green test light, the sensitivity of the off-effect remained constant. The opposite changes of the a-wave and off-effect during chromatic adaptation demonstrate different participation of these components in the generation of color mechanisms in the human retina.

UI	MeSH Term	Description	Entries
D010775	Photic Stimulation	Investigative technique commonly used during ELECTROENCEPHALOGRAPHY in which a series of bright light flashes or visual patterns are used to elicit brain activity.	Stimulation, Photic,Visual Stimulation,Photic Stimulations,Stimulation, Visual,Stimulations, Photic,Stimulations, Visual,Visual Stimulations
D010783	Photometry	Measurement of the various properties of light.	Photometries
D011680	Pupil	The aperture in the iris through which light passes.	Pupils
D012160	Retina	The ten-layered nervous tissue membrane of the eye. It is continuous with the OPTIC NERVE and receives images of external objects and transmits visual impulses to the brain. Its outer surface is in contact with the CHOROID and the inner surface with the VITREOUS BODY. The outer-most layer is pigmented, whereas the inner nine layers are transparent.	Ora Serrata
D003118	Color Perception	Mental processing of chromatic signals (COLOR VISION) from the eye by the VISUAL CORTEX where they are converted into symbolic representations. Color perception involves numerous neurons, and is influenced not only by the distribution of wavelengths from the viewed object, but also by its background color and brightness contrast at its boundary.	Color Perceptions,Perception, Color,Perceptions, Color
D004596	Electroretinography	Recording of electric potentials in the retina after stimulation by light.	Electroretinographies
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000221	Adaptation, Ocular	The adjustment of the eye to variations in the intensity of light. Light adaptation is the adjustment of the eye when the light threshold is increased; DARK ADAPTATION when the light is greatly reduced. (From Cline et al., Dictionary of Visual Science, 4th ed)	Light Adaptation,Adaptation, Light,Adaptations, Light,Adaptations, Ocular,Light Adaptations,Ocular Adaptation,Ocular Adaptations

Related Publications

H J Langhof

[Studies on photopic monochromatic ERG. II. On effects of chromatic adaptation (author's transl)].

September 1973, Nippon Ganka Gakkai zasshi,

H J Langhof

[Studies on the nature of the oscillatory potential of the human electroretinogram. II. Photopic oscillatory potential (on, off response) (author's transl)].

September 1978, Nippon Ganka Gakkai zasshi,

H J Langhof

On- and off-responses in the photopic electroretinogram in complete-type congenital stationary night blindness.

January 1996, Documenta ophthalmologica. Advances in ophthalmology,

H J Langhof

[Potential distribution of scotopic and photopic component of human electroretinogram (author's transl)].

June 1977, Nippon Ganka Gakkai zasshi,

H J Langhof

[Spectral sensitivity of off-response in human VECP during selective chromatic adaptation (author's transl)].

May 1978, Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie. Albrecht von Graefe's archive for clinical and experimental ophthalmology,

H J Langhof

Photopic-scotopic variations of the electroretinogram during dark adaptation.

July 1969, Canadian journal of ophthalmology. Journal canadien d'ophtalmologie,

H J Langhof

[Effects of polarizing current on the electroretinogram. (VII) Effects on the human electroretinogram (author's transl)].

April 1978, Nippon Ganka Gakkai zasshi,

H J Langhof

[Photopic and scotopic components of the human electroretinogram and visually evoked cortical potential (author's transl)].

September 1979, Nippon Ganka Gakkai zasshi,

H J Langhof

On- and off-responses in photopic electroretinogram in complete and incomplete types of congenital stationary night blindness.

January 1987, Japanese journal of ophthalmology,