Characteristics of covert and overt visual orienting: Evidence from attentional and oculomotor capture.
Five visual search experiments found oculomotor and attentional capture consistent with predictions of contingent orienting, contrary to claims that oculomotor capture is purely stimulus driven. Separate saccade and attend-only conditions contained a color target appearing either singly, with an onset or color distractor, or both. In singleton mode, onsets produced oculomotor and attentional capture. In feature mode, capture was absent or greatly reduced, providing evidence for top-down modulation of both types of capture. Although attentional capture by color abstractors was present throughout, oculomotor capture by color occurred only when accompanied by transient change, providing evidence for a dissociation between oculomotor and attentional capture. Oculomotor and attentional capture appear to be mediated by top-down attentional control settings, but transient change may be necessary for oculomotor capture. ((c) 2003 APA, all rights reserved)
National Aeronautics & Space Administration, Ames Research Ctr, Moffett Field, CA, USA. scwu@mail.arc.nasa.gov
Shu-Chieh
SC
Wu
Roger W
RW
Remington
D000328:Adult; D001288:Attention / Q000502:physiology*; D005403:Fixation, Ocular / Q000502:physiology*; D006801:Humans; D009801:Oculomotor Muscles / Q000502:physiology*; D009949:Orientation / Q000502:physiology*; D010775:Photic Stimulation; D012438:Saccades / Q000502:physiology*; D013028:Space Perception / Q000502:physiology; D013037:Spatial Behavior / Q000502:physiology; D014796:Visual Perception / Q000502:physiology