摘要：Single word production has been intensively investigated with electrophysiological techniques, leading to good estimation of the relative time course of the underlying encoding processes (Indefrey & Levelt, 2004). In addition, previous EEG investigations on aphasie speakers have shown that diverging ERP correlates in a picture naming task appeared in different time-windows according to the underlying (lexical-semantic or lexical-phonological) impairments (Laganaro et al., 2009; 2011). By contrast, the estimation of the time-course of phonetic encoding and its impairment has not been investigated directly so far. Here we take advantage of methodological developments in the analysis of EEG data allowing analysis of ERPs covering the entire encoding processes (from stimulus onset to articulation (Laganaro & Perret, 2011) to investigate (1) the time-window associated with phonetic encoding in non-brain damaged speakers and (2) the time-windows of diverging ERP correlates in two stroke patients with apraxia of speech (AoS). The hypotheses are that (1) modulations of ERPs related to the manipulation of a phonetic variable (syllable frequency) will be observed in a late time-window (close to articulation) in healthy controls; (2) ERP will diverge from controls in this late time-window in patients with AoS.
