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Detection facilitation by collinear stimuli in humans: Dependence on strength and sign of contrast
- Source :
- Vision Research, Vision Research, Elsevier, 1998, 38 (3), pp.423-8, Vision Research, 1998, 38 (3), pp.423-8
- Publication Year :
- 1998
-
Abstract
- International audience; We measured detection of a thin vertical line (target) in the presence of a slightly thicker collinear, adjacent line (inducer). Sign and strength of contrast of the inducer were varied. Test lines could be either bright or dark. Detection thresholds were obtained through a temporal two-alternative forced-choice (2AFC) procedure with the method of constant stimuli. When target and inducer had equal contrast polarity, low thresholds of target lines were observed for low inducer contrasts and increased with increasing inducer contrast. With opposite contrast polarity of target and inducer, thresholds were high for low inducer contrasts and decreased for increasing contrast thereof. Our results support the hypothesis that cortical mechanisms with different sensitivity to the sign and strength of contrast participate in the detection facilitation of line contours.
- Subjects :
- Male
[INFO.INFO-AI] Computer Science [cs]/Artificial Intelligence [cs.AI]
Rotation
[SDV.BA] Life Sciences [q-bio]/Animal biology
Subthreshold summation
Polarity (physics)
050105 experimental psychology
MESH: Psychophysics
[INFO.INFO-AI]Computer Science [cs]/Artificial Intelligence [cs.AI]
Contrast Sensitivity
03 medical and health sciences
MESH: Rotation
0302 clinical medicine
Optics
Nuclear magnetic resonance
Orientation
Contrast polarity
Psychophysics
Humans
0501 psychology and cognitive sciences
Inducer
MESH: Contrast Sensitivity
MESH: Humans
MESH: Visual Perception
Chemistry
Detection threshold
business.industry
[SDV.BA]Life Sciences [q-bio]/Animal biology
05 social sciences
[SDV.NEU.SC]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Cognitive Sciences
Contrast (statistics)
Long-range spatial interactions
MESH: Male
Sensory Systems
Detection
Ophthalmology
Sensory Thresholds
Visual Perception
Facilitation
Female
MESH: Sensory Thresholds
business
MESH: Female
030217 neurology & neurosurgery
[SDV.NEU.SC] Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Cognitive Sciences
Sign (mathematics)
Subjects
Details
- ISSN :
- 00426989
- Database :
- OpenAIRE
- Journal :
- Vision Research, Vision Research, Elsevier, 1998, 38 (3), pp.423-8, Vision Research, 1998, 38 (3), pp.423-8
- Accession number :
- edsair.doi.dedup.....d0049d679ad09c772c1f5760ff0641f7