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The speed of orthographic processing during lexical decision : electrophysiological evidence for independent coding of letter identity and letter position in visual word recognition

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Mariol, Marina [UCL] Jacques, Corentin [UCL] Schelstraete, Marie-Anne [UCL] Rossion, Bruno [UCL]

Adults can decide rapidly if a string of letters is a word or not. However, the exact time course of this discrimination is still an open question. Here we sought to track the time course of this discrimination and to determine how orthographic information -- letter position and letter identity -- is computed during reading. We used a go/no-go lexical decision task while recording event-related potentials (ERPs). Subjects were presented with single words (go trials) and pseudowords (no-go trials), which varied in orthographic conformation, presenting either a double consonant frequently doubled (i.e., "ss") or never doubled (i.e., "zz") (identity factor); and a position of the double consonant was which either legal or illegal (position factor), in a 2 x 2 factorial design. Words and pseudowords clearly differed as early as 230 msec. At this latency, ERP waveforms were modulated both by the identity and by the position of letters: The fronto-central no-go N2 was the smallest in amplitude and peaked the earliest to pseudowords presenting both an illegal double-letter position and an identity never encountered. At this stage, the two factors showed additive effects, suggesting an independent coding. The factors of identity and position of double letters interacted much later in the process, at the P3 level, around 300-400 msec on frontal and central sites, in line with the lexical decision data obtained in the behavioral study. Overall, these results show that the speed of lexical decision may depend on orthographic information coded independently by the identity and position of letters in a word.

Document type Article de périodique (Journal article) – Article de recherche – Journal Article, Research Support, Non-U.S. Gov't
Access type Accès restreint
Publication date 2008
Language Anglais
Journal information "Journal of Cognitive Neuroscience" - Vol. 20, no. 7, p. 1283-1299 (2008)
Peer reviewed yes
Publisher M I T Press ((United States) Cambridge)
issn 0898-929X
e-issn 1530-8898
Publication status Publié
Affiliations UCL - MD/FSIO - Département de physiologie et pharmacologie
UCL - PSP/PSP - Faculté de psychologie et des sciences de l'éducation
MESH Subject Adolescent ; Adult ; Analysis of Variance ; Brain Mapping ; Decision Making - physiology ; Discrimination (Psychology) - physiology ; Electroencephalography - methods ; Evoked Potentials - physiology ; Female ; Humans ; Male ; Neuropsychological Tests ; Pattern Recognition, Visual - physiology ; Reaction Time - physiology ; Reading ; Recognition (Psychology) - physiology ; Semantics ; Time Factors ; Vocabulary
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Bibliographic reference Mariol, Marina ; Jacques, Corentin ; Schelstraete, Marie-Anne ; Rossion, Bruno. The speed of orthographic processing during lexical decision : electrophysiological evidence for independent coding of letter identity and letter position in visual word recognition. In: Journal of Cognitive Neuroscience, Vol. 20, no. 7, p. 1283-1299 (2008)
Permanent URL http://hdl.handle.net/2078.1/22149