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Cerebral Cortex Advance Access published online on November 13, 2006
Cerebral Cortex, doi:10.1093/cercor/bhl110
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© The Author 2006. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Article

Cerebral Bases of Subliminal and Supraliminal Priming during Reading

Sid Kouider 1 *, Stanislas Dehaene 2, Antoinette Jobert 3, and Denis Le Bihan 4

1 Cognitive Neuroimaging Unit, INSERM U562, SHFJ, CEA/DSV, Orsay, France; Laboratoire des Sciences Cognitives et Psycholinguistique (EHESS/CNRS/DEC-ENS), Paris, France
2 Cognitive Neuroimaging Unit, INSERM U562, SHFJ, CEA/DSV, Orsay, France; Collège de France, Paris, France
3 Cognitive Neuroimaging Unit, INSERM U562, SHFJ, CEA/DSV, Orsay, France
4 Anatomical and Functional Neuroimaging Unit, SHFJ, CEA/DSV, Orsay, France

* To whom correspondence should be addressed.
Sid Kouider, E-mail: sidk{at}lscp.ehess.fr


  Abstract

Several studies have investigated the neural correlates of conscious perception by contrasting functional magnetic resonance imaging (fMRI) activation to conscious and nonconscious visual stimuli. The results often reveal an amplification of posterior occipito-temporal activation and its extension into a parieto-frontal network. However, some of these effects might be due to a greater deployment of attentional or strategical processes in the conscious condition. Here, we examined the brain activity evoked by visible and invisible stimuli, both of which were irrelevant to the task. We collected fMRI data in a masking paradigm in which subliminal versus supraliminal letter strings were presented as primes while subjects focused attention on another subsequent, highly visible target word. Under those conditions, prime visibility was associated with greater activity confined to bilateral posterior occipito-temporal cortices, without extension into frontal and parietal cortices. However, supraliminal primes, compared with subliminal primes, evoked more extensive repetition suppression in a widely distributed set of parieto-frontal areas. Furthermore, only supraliminal primes caused phonological repetition enhancement in left inferior frontal and anterior insular cortex. Those results suggest a 2-stage view of conscious access: Relative to masked stimuli, unmasked stimuli elicit increased occipito-temporal activity, thus allowing them to compete for global conscious access and to induce priming in multiple distant areas. In the absence of attention, however, their access to a second stage of distributed parieto-frontal processing may remain blocked.

Keywords: consciousness; fMRI; priming; reading; subliminal.
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S. Kouider, E. Eger, R. Dolan, and R. N. Henson
Activity in Face-Responsive Brain Regions is Modulated by Invisible, Attended Faces: Evidence from Masked Priming
Cereb Cortex, April 9, 2008; (2008) bhn048v1.
[Abstract] [Full Text] [PDF]


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