RF shape channels: The processing of compound Radial Frequency patterns.
نویسندگان
چکیده
منابع مشابه
Radial frequency adaptation reveals interacting contour shape channels
Combinations of radial frequency (RF) patterns may be used to represent the contours of complex shapes. Previous work has shown that many radial frequency patterns are processed globally and multiple curvature mechanisms have been proposed to account for human performance in detecting these patterns. The current paper provides a direct test of this proposal and also, investigates how different ...
متن کاملGlobal shape aftereffects in composite radial frequency patterns.
Individual radial frequency (RF) patterns are generated by modulating a circle's radius as a sinusoidal function of polar angle and have been shown to tap into global shape processing mechanisms. Composite RF patterns can reproduce the complex outlines of natural shapes and examining these stimuli may allow us to interrogate global shape mechanisms that are recruited in biologically relevant ta...
متن کاملEvaluating shape after-effects with radial frequency patterns
Mechanisms selective for complex shape are vulnerable to adaptation techniques historically used to probe those underlying performance in lower-level visual tasks. We explored the nature of these shape after-effects using radial frequency patterns. Adapting to a radial frequency pattern resulted in a strong and systematic after-effect of a pattern that was 180 degrees out of phase with the adap...
متن کاملNarrow-band radial frequency shape channels revealed by sub-threshold summation
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,...
متن کاملGlobal processing of random-phase radial frequency patterns but not modulated lines.
Previously, researchers have used circular contours with sinusoidal deformations of the radius (radial frequency [RF] patterns) to investigate the underlying processing involved in simple shape perception. On finding that the rapid improvement in sensitivity to deformation as more cycles of modulation were added was greater than expected from probability summation across sets of local independe...
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ژورنال
عنوان ژورنال: Journal of Vision
سال: 2017
ISSN: 1534-7362
DOI: 10.1167/17.10.1255