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Letter binding and invariant recognition of masked words: behavioral and neuroimaging evidence
Authors:Dehaene S  Jobert A  Naccache L  Ciuciu P  Poline J-B  Le Bihan D  Cohen L
Affiliation:Institut National de la Santéet de la Recherche Médicale, Unit 562, and;Unitéde Neuroimagerie Anatomo-Fonctionnelle, Institut Fédératif de Recherches 49, Service Hospitalier Frédéric Joliot, Commissariat àl'Energie Atomique, Orsay, France
Abstract:Abstract— Fluent readers recognize visual words across changes in case and retinal location, while maintaining a high sensitivity to the arrangement of letters. To evaluate the automaticity and functional anatomy of invariant word recognition, we measured brain activity during subliminal masked priming. By preceding target words with an unrelated prime, a repeated prime, or an anagram made of the same letters, we separated letter-level and whole-word codes. By changing the case and theretinal location of primes and targets, we evaluated the invariance of those codes. Our results indicate that an invariant binding of letters into words is achieved unconsciously through aseries of increasingly invariant stages in the left occipito-temporal pathway.
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