Document Detail


Color and brightness encoded in a common L- and M-cone pathway with expansive and compressive nonlinearities.
MedLine Citation:
PMID:  24591566     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Lights near 560 nm appear brighter when flickered, whereas lights near 520 or 650 nm appear yellower. Both effects are consistent with signal distortion within the visual pathway-brightness changes at an expansive nonlinearity, and hue shifts at a compressive one. We previously manipulated the distortion products generated by each nonlinearity to extract the temporal properties of stages of the L- and M-cone pathways that signal brightness and color before (early stages) and after (late stages) each nonlinearity. We find that the attenuation characteristics of the early and late stages are virtually identical in both pathways: The early temporal stage acts like a band-pass filter peaking at 10-15 Hz, while the late stage acts like low-pass filter with a cut-off frequency near 3 Hz. We propose a physiologically relevant model that accounts for the filter shapes and incorporates both nonlinearities within a common parvocellular pathway. The shape of the early band-pass filter is consistent with antagonism between center signals and more sluggish and delayed surround signals, while the late filter is consistent with a simple two-stage low-pass filter. Modeling suggests that the brightness change and hue shift are both initially caused by the half-wave rectification and partition of signals into ON and OFF components. However, the hue shift is probably caused by the additional effects of a later nonlinearity that compresses chromatic red and green signals. Plausible sites for the expansive half-wave rectifying nonlinearity are after surround antagonism, possibly from horizontal cells, but the compressive nonlinearity is likely to be after the late filter.
Authors:
Andrew Stockman; Daniela Petrova; G Bruce Henning
Related Documents :
25347406 - Evaluation of heading performance with vibrotactile guidance: the benefits of informati...
19532196 - Etendue-preserving mixing and projection optics for high-luminance leds, applied to aut...
25276706 - Assessment of sound levels in a neonatal intensive care unit in tabriz, iran.
12118876 - Relation between glare and driving performance.
18687716 - Allelic variance between grm6 mutants, grm6nob3 and grm6nob4 results in differences in ...
19826266 - Analysis of upper extremity motion in children after axillary burn scar contracture rel...
Publication Detail:
Type:  Journal Article     Date:  2014-03-03
Journal Detail:
Title:  Journal of vision     Volume:  14     ISSN:  1534-7362     ISO Abbreviation:  J Vis     Publication Date:  2014  
Date Detail:
Created Date:  2014-03-04     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101147197     Medline TA:  J Vis     Country:  United States    
Other Details:
Languages:  eng     Pagination:  -     Citation Subset:  IM    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Surface dynamics of GluN2B-NMDA receptors controls plasticity of maturing glutamate synapses.
Next Document:  Dynamic illusory size contrast: A relative-size illusion modulated by stimulus motion and eye moveme...