Journal
CONSCIOUSNESS AND COGNITION
Volume 17, Issue 4, Pages 1345-1358Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.concog.2007.08.005
Keywords
Masked priming; Proportion effect; Bottom-up effect; Top-down effect
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The global neuronal workspace theory [Dehaene, S., & Naccache, L. (2001). Towards it Cognitive neuroscience of consciousness: basic evidence and a workspace framework. Cognition, 79, 1-37.] proposes that it is impossible for an unconscious stimulus to be used strategically to enhance task performance (bottom-up effect), while a fully consciously perceived stimulus can be used to improve task performance (top-down effect). Two experiments were designed to investigate these hypotheses. In a first experiment we investigated whether it manipulation of the proportion of Arabic/number word targets had a top-down effect. Since the subjects were fully aware of the target, we expected that this manipulation could be used to enhance task performance. In a second experiment we determined whetheer a manipulation of the proportion of Arabic/number word primes had a bottom-up effect. Since the subjects were unaware of the prime, we hypothesized that they would be unable to use the manipulation to enhance task performance and therefore the manipulation would have no effect. Both hypotheses were largely confirmed. (C) 2007 Elsevier Inc. All rights reserved.
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