Linked Life Data

20883335

Source:http://linkedlifedata.com/resource/pubmed/id/20883335

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
2010-10-4
pubmed:abstractText
Transient visual evoked cortical potentials (VECP) were recorded from the scalp of healthy normal trichromats (n = 12). VECPs were elicited by onset/offset presentation of patterned stimuli of two kinds: isochromatic luminance-modulated, and equiluminant red-green modulated, sine wave gratings. The amplitude and latency of the major onset components of the onset/offset VECP were measured and plotted as a function of the logarithm of pooled cone contrast. The early onset components, achromatic C1 and chromatic N1, increase linearly with log contrast, but N1 has a higher contrast gain than C1. The late onset components, achromatic C2 and chromatic N2, have similar contrast gain, and similar response as a function of contrast level: both increase in the low-to-medium range of contrasts and saturate at high contrast levels. In the range of pooled cone contrast tested, C1 and N1 show similar latencies, whilst C2 shows shorter latencies than N2. We suggest that C1 and N1 are generated by the same visual mechanism with high red-green contrast gain and low luminance contrast gain, whilst C2 and N2 are generated by different visual mechanisms.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
1475-1313
pubmed:author
pubmed:copyrightInfo
© 2010 The Authors, Ophthalmic and Physiological Optics © 2010 The College of Optometrists.
pubmed:issnType
Electronic
pubmed:volume
30
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
518-24
pubmed:meshHeading
pubmed:year
2010
pubmed:articleTitle
Cone contrast influence on components of the pattern onset/offset VECP.
pubmed:affiliation
Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, PA, Brazil. brunodgomes@ufpa.br
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't