title: Task-dependent modulation of word processing mechanisms during modified visual search tasks.
abstract: During visual search for words, the impact of the visual and semantic features of words varies as a function of the search task. This event-related potential (ERP) study focused on the way these features of words are used to detect similarities between the distractor words that are glanced at and the target word, as well as to then reject the distractor words. The participants had to search for a target word that was either given literally or defined by a semantic clue among words presented sequentially. The distractor words included words that resembled the target and words that were semantically related to the target. The P2a component was the first component to be modulated by the visual and/or semantic similarity of distractors to the target word, and these modulations varied according to the task. The same held true for the later N300 and N400 components, which confirms that, depending on the task, distinct processing pathways were sensitized through attentional modulation. Hence, the process that matches what is perceived with the target acts during the first 200 ms after word presentation, and both early detection and late rejection processes of words depend on the search task and on the representation of the target stored in memory.
authors.affiliation: a Centre de Recherches sur la Cognition et l'Apprentissage , Université de Poitiers, Université François Rabelais de Tours, CNRS UMR 7295, Maison des Sciences de l'Homme et de la Société , Poitiers , France.
authors.forename: Julien
authors.initials: J
authors.lastname: Dampure
authors.affiliation: a Centre de Recherches sur la Cognition et l'Apprentissage , Université de Poitiers, Université François Rabelais de Tours, CNRS UMR 7295, Maison des Sciences de l'Homme et de la Société , Poitiers , France.
authors.forename: Abdelrhani
authors.initials: A
authors.lastname: Benraiss
authors.affiliation: a Centre de Recherches sur la Cognition et l'Apprentissage , Université de Poitiers, Université François Rabelais de Tours, CNRS UMR 7295, Maison des Sciences de l'Homme et de la Société , Poitiers , France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Vibert
mesh_terms: D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D001288:Attention / Q000502:physiology*; D001921:Brain / Q000502:physiology*; D004569:Electroencephalography; D004585:Electrooculography; D005074:Evoked Potentials, Visual / Q000502:physiology*; D005133:Eye Movements / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D010775:Photic Stimulation; D011930:Reaction Time / Q000502:physiology; D012660:Semantics; D014825:Vocabulary; D055815:Young Adult
keywords: Categorization; Cognitive task-set; Electroencephalography; Event-related potentials; Word processing pathways