Properties of spatial attention in conscious and nonconscious visual information processing

Consciousness and Cognition 20 (2):426-431 (2011)
A modified flanker task was used to assess the effects of spatial attention during conscious and nonconscious processing. In line with prior findings, we demonstrated that increasing spatial separation between flankers and probes diminished the differences between reaction times to the incongruent and congruent probe–flanker pairs. This trend occurred even when the identity of flankers was suppressed from awareness by a metacontrast mask, indicating that spatial attention can be allocated to information processed at the nonconscious, in addition to the conscious, levels, that effects of spatial attention at these two levels can be equivalent, and that attention deployed at the nonconscious level of processing can be characterized by a spatial gradient that is nearly identical to that found at the conscious level of processing
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DOI 10.1016/j.concog.2010.07.001
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Michael I. Posner (1994). Attention: The Mechanisms of Consciousness. Proceedings of the National Academy of Sciences Usa 91:7398-7403.

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