title: Dynamics of phonological-phonetic encoding in word production: evidence from diverging ERPs between stroke patients and controls.
abstract: While the dynamics of lexical-semantic and lexical-phonological encoding in word production have been investigated in several event-related potential (ERP) studies, the estimated time course of phonological-phonetic encoding is the result of rather indirect evidence. We investigated the dynamics of phonological-phonetic encoding combining ERP analyses covering the entire encoding process in picture naming and word reading tasks by comparing ERP modulations in eight brain-damaged speakers presenting impaired phonological-phonetic encoding relative to 16 healthy controls. ERPs diverged between groups in terms of local waveform amplitude and global topography at ∼400 ms after stimulus onset in the picture naming task and at ∼320-350 ms in word reading and sustained until 100 ms before articulation onset. These divergences appeared in later time windows than those found in patients with underlying lexical-semantic and lexical-phonological impairment in previous studies, providing evidence that phonological-phonetic encoding is engaged around 400 ms in picture naming and around 330 ms in word reading.
authors.affiliation: FAPSE, University of Geneva, Switzerland. marina.laganaro@unige.ch
authors.forename: Marina
authors.initials: M
authors.lastname: Laganaro
authors.forename: Grégoire
authors.initials: G
authors.lastname: Python
authors.forename: Ulrike
authors.initials: U
authors.lastname: Toepel
mesh_terms: D000328:Adult; D001184:Articulation Disorders / Q000503:physiopathology*; D004569:Electroencephalography; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010700:Phonetics; D010775:Photic Stimulation; D012660:Semantics; D012815:Signal Processing, Computer-Assisted; D013060:Speech / Q000502:physiology*; D020521:Stroke / Q000503:physiopathology*
keywords: Aphasia; ERP; Phonological–phonetic; Picture naming; Speech production