title: Rapid processing of closure and viewpoint-invariant symmetry: behavioral criteria for feedforward processing.
abstract: To pin down the processing characteristics of symmetry and closure in contour processing, we investigated their ability to activate rapid motor responses in a primed flanker task. In three experiments, participants selected as quickly and accurately as possible the one of two target contours possessing symmetry or closure. Target pairs were preceded by prime pairs whose spatial arrangement was consistent or inconsistent with respect to the required response. We tested for the efficiency and automaticity of symmetry and closure processing. For both cues, priming effects were present in full magnitude in the fastest motor responses consistent with a simple feedforward model. Priming effects from symmetry cues were independent of skewing and the orientation of their symmetry axis but sometimes failed to increase with increasing prime-target interval. We conclude that closure and (possibly) viewpoint-independent symmetry cues are extracted rapidly during the first feedforward wave of neuronal processing.
authors: Faculty of Social Sciences, Psychology I, University of Kaiserslautern, Erwin-Schrödinger-Str. Geb. 57, 67663, Kaiserslautern, Germany, filipp.schmidt@sowi.uni-kl.de.
authors: Filipp
authors: F
authors: Schmidt
authors: Thomas
authors: T
authors: Schmidt
mesh_terms: D000328:Adult; D005260:Female; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D008297:Male; D010466:Perceptual Closure / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology*; D055815:Young Adult
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