Separating transducer non-linearities and multiplicative noise in contrast discrimination.

Separating transducer non-linearities and multiplicative noise in contrast discrimination. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Separating transducer non-linearities and multiplicative noise in contrast discrimination. Abstract Text:

Stanley A Klein,

It has been difficult to isolate the factors that limit contrast discrimination, one of the most fundamental aspects of the visual system. claim to have found a method that can answer the question of why discrimination thresholds increase with reference contrast. Is it because of a saturating contrast response function or because of increasing (multiplicative) noise? Based on four datasets they conclude that multiplicative noise is the controlling factor. disagree and claim the jury is still out because only one of the four datasets has sufficiently good statistics to support the KCT claim. I reanalyze the KCT data and come to a different conclusion. I agree with GM that two of the four datasets have thresholds that are too low to be useful in discriminating models and that one dataset supports the KCT claim. The fourth dataset is the most interesting one in that it provides the strongest support for the KCT claim, but GM throw it out because the chi(2) of the best fit is high. The present paper makes a number of points: (1) two novel methods are used to fit the fourth dataset. One pair of models is based on the strong "finger error" asymmetry between the high and low contrast asymptotes of the psychometric function in the fourth dataset. I find that some version of multiplicative noise is needed. However, it may be multiplicative noise that depends on prior trials rather than just on the present trial. (2) Another model that allows the contrast response function to have maximal freedom fits the fourth dataset with a reasonable chi square, and with a need for multiplicative noise. (3) I examine alternative parameterizations of the model functions used by KCT and GM that provide a more intuitive interpretation of the parameters. In summary, although I find the data do support a generalized form of multiplicative noise, I agree with GM that the jury remains out about what are the factors that limit contrast discrimination.

Separating transducer non-linearities and multiplicative noise in contrast discrimination. Publishing Authors By Initials

SA Klein,

For similar psychological phenomena and processes: mental processes: perception: sensory thresholds research abstracts see: psychological phenomena and processes: mental processes: perception: sensory thresholds research

PUBMED ID PMID:

MEDLINE DATE:

Separating transducer non-linearities and multiplicative noise in contrast discrimination. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Vision research

VOLUME: 46

Page Numbers: 4279-93

Journal Abbreviation: Vision Res.

ISSN: 0042-6989

DAY: 2

MONTH: 10

YEAR: 2006

Separating transducer non-linearities and multiplicative noise in contrast discrimination. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 417402

Separating transducer non-linearities and multiplicative noise in contrast discrimination. Keywords Mesh Terms:

KEYWORDS: Sensory Thresholds

MESH TERMS:

Chemical & Substance for Abstract: Separating transducer non-linearities and multiplicative noise in contrast discrimination. Information

Substance Name:

Registry Number:

Grant and Affiliation Information for Separating transducer non-linearities and multiplicative noise in contrast discrimination.

AFFILIATION: University of California, Berkeley, USA. sklein@socrates.berkeley.edu <sklein@socrates.berkeley.edu>

Country: England

AGENCY: United States NEI

GRANT: EY 04776

ACRONYM: EY

MEDLINETA: Vision Res

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Separating transducer non-linearities and multiplicative noise in contrast discrimination Related Publications

• A liquid chromatographic-mass spectrometric method to evaluate the distribution kinetics of 1,2-diethylbenzene and its metabolite 1,2-diacetylbenzene in the F344 male rat.
• Adipose tissue, hepatic, and skeletal muscle insulin sensitivity in extremely obese subjects with acanthosis nigricans.
• Alcohol use and health outcomes in the oldest old.
• Clinical approach to a child with abdominal pain who might have appendicitis.
• Confirmation of linkage to ocular refraction on chromosome 22q and identification of a novel linkage region on 1q.
• Disruption in Th1/Th2 immune response in young adult smokers.
• Does solitary substance use increase adolescents' risk for poor psychosocial and behavioral outcomes? A 9-year longitudinal study comparing solitary and social users.
• Effect of lifestyle intervention on metabolic coronary heart disease risk factors in obese older adults.
• Endocrine function tests in pediatric practice.
• Endogenous opiates and behavior: 2005.
• Expanded genome scan in extended families with age-related macular degeneration.
• Laboratory transmission of Japanese encephalitis, West Nile, and Getah viruses by mosquitoes (Diptera: Culicidae) collected near Camp Greaves, Gyeonggi Province, Republic of Korea 2003.
• Monoclonal antibodies that target pathological assemblies of Abeta.
• Neonatal adrenal physiology.
• Nonseminomatous germ cell tumor after chemotherapy with residual mass invading the spine.
• Opportunities for prevention of prostate cancer: genetics, chemoprevention, and dietary intervention.
• Physical activity and the 15-year cumulative incidence of age-related macular degeneration: the Beaver Dam Eye Study.
• Role of GABAergic antagonism in the neuroprotective effects of bilobalide.
• Role of Toll-like receptor 9 in Legionella pneumophila-induced interleukin-12 p40 production in bone marrow-derived dendritic cells and macrophages from permissive and nonpermissive mice.
• Self-assembling cyclic peptides: molecular dynamics studies of dimers in polar and nonpolar solvents.
• Separating transducer non-linearities and multiplicative noise in contrast discrimination.
• Serotonin in trigeminal ganglia of female rodents: relevance to menstrual migraine.
• Serum prostate-specific antigen levels in older men with or at risk of HIV infection.
• The American filler experience - a response to Dr Baumann.
• The PharmGKB: integration, aggregation, and annotation of pharmacogenomic data and knowledge.
• The challenge of preparation for a chemical, biological, radiological or nuclear terrorist attack.
• The effects of EDTA-Tris infusion on the equine endometrium.
• V beta1+ J beta1.1+/V alpha2+ J alpha49+ CD4+ T cells mediate resistance against infection with Blastomyces dermatitidis.
• Yeast recombination factor Rdh54 functionally interacts with the Rad51 recombinase and catalyzes Rad51 removal from DNA.
• [Relative study of soluble syndecan-1 and prognosis of patients with multiple myeloma]