Linked Life Data

19275912

Source:http://linkedlifedata.com/resource/pubmed/id/19275912

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
8
pubmed:dateCreated
2009-4-15
pubmed:abstractText
Radial Frequency (RF) contours provide a unifying system to represent familiar shapes, such as triangles (RF3), squares (RF4) and pentagons (RF5), but it is not clear whether these sorts of shapes are detected by separate RF-tuned processes, or instead by a common shape mechanism. It has been suggested that multiple mechanisms are responsible for the detection of globally processed RF patterns, at least up to RF10. In this study, we used a sub-threshold summation paradigm to determine whether multiple shape channels are required to account for detection of RF patterns in this range. To do so, the modulation detection threshold required for discriminating an RF component in isolation from a circle, was compared to that obtained when a second, half-threshold amplitude, component was added to the single closed-contour. Threshold improvement occurred when the two shape components were the same RF, but usually not when the components differed in RF. These results cannot be explained by a single broadly-tuned shape channel and suggest that several narrow-band RF channels underpin detection of patterns below RF10, where the shapes have previously been shown to be processed globally.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
1878-5646
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
49
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
843-50
pubmed:meshHeading
pubmed:year
2009
pubmed:articleTitle
Narrow-band radial frequency shape channels revealed by sub-threshold summation.
pubmed:affiliation
School of Psychology, The University of Western Australia, 35 Stirling Highway, Crawley 6009, Western Australia, Australia. jason.bell@mail.mcgill.ca
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't