PMID: 708800Sep 28, 1978Paper

A model for light adaptation: producing Weber's law with bleaching-type kinetics

Biological cybernetics
S M Dawis


An "adaptation model" having two stages is introduced and its mathematical properties are examined. The two stages are the "adaptive process" (parameter Kb), which has bleaching-type kinetics, and the "response function" (parameters Kr and n), which incorporates response saturation. In order to study the increment threshold functions generated by the "adaptation model" the concept of a "detector" is required. It is demonstrated that without an adaptive process the compression hypothesis, in the form of the "difference equation", produces increment threshold functions which saturate and do not obey Weber's law. It is then shown that an adaptive process with bleaching-type kinetics can prevent saturation and produce Weber's law behavior provided that the "adaptive strength" of the system exceeds the "detector sensitivity".


Jan 1, 1978·Annual Review of Psychology·D I MacLeod
Jan 1, 1977·Vision Research·T P Williams, J G Gale
Nov 1, 1975·The Journal of General Physiology·J Kleinschmidt, J E Dowling
Jan 1, 1974·The Journal of General Physiology·R A Normann, F S Werblin
Dec 1, 1972·The Journal of General Physiology·J E Dowling, H Ripps
Apr 1, 1973·The Journal of General Physiology·P WitkovskyH Ripps
Feb 1, 1973·The Journal of Physiology·D G Green
Jun 16, 1972·Science·S R GrabowskiW L Pak
Nov 1, 1971·Vision Research·N W Daw, A L Pearlman
Jan 1, 1965·Cold Spring Harbor Symposia on Quantitative Biology·H B Barlow
Jan 20, 1967·Science·J E Dowling
Jun 1, 1968·Vision Research·W A RUSHTON, G H Henry
Aug 1, 1966·The Journal of Physiology·K I Naka, W A RUSHTON
Jul 8, 1967·Nature·G W WeinsteinJ E Dowling
Mar 16, 1965·Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character·W A RUSHTON


Jan 1, 1981·Biological cybernetics·S M Dawis
Jan 1, 1981·Vision Research·S M Dawis
Oct 20, 1998·Progress in Retinal and Eye Research·I Perlman, R A Normann
Oct 1, 1991·Visual Neuroscience·S M Dawis
Apr 12, 1979·Nature·H Bülthoff, K G Götz

Related Concepts

Light Adaptation
Ciliary Photoreceptor Cells

Trending Feeds


Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Lipidomics & Rhinovirus Infection

Lipidomics can be used to examine the lipid species involved with pathogenic conditions, such as viral associated inflammation. Discovered the latest research on Lipidomics & Rhinovirus Infection.

Spatio-Temporal Regulation of DNA Repair

DNA repair is a complex process regulated by several different classes of enzymes, including ligases, endonucleases, and polymerases. This feed focuses on the spatial and temporal regulation that accompanies DNA damage signaling and repair enzymes and processes.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Torsion Dystonia

Torsion dystonia is a movement disorder characterized by loss of control of voluntary movements appearing as sustained muscle contractions and/or abnormal postures. Here is the latest research.

Archaeal RNA Polymerase

Archaeal RNA polymerases are most similar to eukaryotic RNA polymerase II but require the support of only two archaeal general transcription factors, TBP (TATA-box binding protein) and TFB (archaeal homologue of the eukaryotic general transcription factor TFIIB) to initiate basal transcription. Here is the latest research on archaeal RNA polymerases.

Alzheimer's Disease: MS4A

Variants within the membrane-spanning 4-domains subfamily A (MS4A) gene cluster have recently been implicated in Alzheimer's disease in genome-wide association studies. Here is the latest research on Alzheimer's disease and MS4A.

Central Pontine Myelinolysis

Central Pontine Myelinolysis is a neurologic disorder caused most frequently by rapid correction of hyponatremia and is characterized by demyelination that affects the central portion of the base of the pons. Here is the latest research on this disease.