Slide Slam E3
Electrophysiological signatures of spoken word production
Matteo Mascelloni1, Vitoria Piai2,3, Katie McMahon4, Catherine Liegeois-Chauvel5, Greig de Zubicaray1; 1chool of Psychology and Counselling, Faculty of Health, Queensland University of Technology, 2Donders Centre for Cognition, Radboud University, 3Donders Centre for Medical Neuroscience, Radboud University Medical Centre, 4School of Clinical Sciences, Faculty of Health, Queensland University of Technology, 5School of Medicine, University of Pittsburgh
Spoken word production models assume multiple stages of processing are needed to retrieve and produce a word (i.e., conceptual, lexical, and phonological word form retrieval, and articulation). One naming paradigm that has been used to test these models is Picture-Word Interference (PWI). In PWI, participants are asked to name a picture while ignoring written distractor words Two effects observed in this paradigm are semantic interference and phonological facilitation. The former refers to slower target naming latencies when distractors are semantically related to the target compared to unrelated (e.g., wolf-PIG vs. violin-PIG), while the latter refers to facilitated naming with phonologically related distractors (e.g., pin-PIG). These two effects have been well investigated with behavioural studies, with many studies demonstrating them within a limited range of Stimuli Onset Asynchronies (SOAs; between -150 and 150 ms). Behavioural data can provide insight on how different stages of the production process interact with each other, the use of electrophysiology can shed light, thanks to the high temporal resolution, on the timing of different stages and help to resolve the debate about different model architectures (e.g., serial, cascade, interactive). Additionally, it can contribute in updating current neurophysiological models of speech production. However, the reported electrophysiological findings for these PWI effects are inconsistent across studies. The result most commonly reported for semantic interference is an N400-like ERP modulation while no clear result has been reported for phonological facilitation (de Zubicaray & Piai, 2019). While ERPs can provide information about the timing of the process, analysis of oscillatory activity can provide additional information about underlying, non-phase locked, neural processes. The aim of this experiment is firstly to replicate the ERP effects previously reported for semantic interference (e.g. Dell’Acqua et al., 2010; Piai, Roelofs, Jensen, Schoffelen, & Bonnefond, 2014). Secondly, we aim to identify the ERP effects associated with phonological facilitation, and thirdly we aim to analyse the neuronal oscillations associated with lexical and phonological word form retrieval processes, hypothesized to be represented in the Beta (12-30 Hz) and Theta (4-7 Hz) frequency ranges, distinguishing them from the oscillations underpinning other processes (e.g. articulation). EEG data (64 channels) from 24 subjects has now been collected using a PWI paradigm in two separate experiments (semantic interference and phonological facilitation). Data analysis is ongoing, and results will be presented at SNL.