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Related Experiment Video

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Interaction between Phonological and Semantic Processes in Visual Word Recognition using Electrophysiology

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Published on: June 29, 2021

Parallel or sequential? Decoding conceptual and phonological/phonetic information from MEG signals during language

Francesca Carota^1,2, Jan-Mathijs Schoffelen^1,2, Robert Oostenveld^2,3

¹Max Planck Institute for Psycholinguistics, Nijmegen, The Netherlands.

Cognitive Neuropsychology

|December 18, 2023

Summary

Neural activity for speech planning shows early parallel activation of multiple variables, challenging cascade models. This suggests complex, interactive processing during word preparation for speaking.

Keywords:

Conceptual preparation cascading vs. parallel processes magnetoencephalography pattern classification phonological encoding

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Detecting Pre-Stimulus Source-Level Effects on Object Perception with Magnetoencephalography

Detecting Pre-Stimulus Source-Level Effects on Object Perception with Magnetoencephalography

Published on: July 26, 2019

Area of Science:

Neuroscience
Psycholinguistics
Cognitive Science

Background:

Speech production involves complex, timed planning from meaning to articulation.
Previous research presented conflicting evidence on whether neural events occur sequentially or in parallel.

Purpose of the Study:

To investigate the temporal dynamics of neural activation during speech planning.
To differentiate between sequential cascade and early parallel processing models of speech preparation.

Main Methods:

Used magnetoencephalography (MEG) to record neuromagnetic activity from 34 participants.
Participants overtly named images from four object categories, with word length and phonological density manipulated.
Applied multivariate pattern analysis (MVPA) searchlights in source space to decode neural patterns.

Main Results:

Object categories were decoded in occipitotemporal and middle temporal cortex.
Phonological and phonetic variables were decoded early in left inferior frontal cortex (BA 44) and motor cortex.
Findings indicate early, parallel activation of multiple linguistic variables.

Conclusions:

The results support an early parallel processing model for speech preparation.
Interactivity and correlated properties of linguistic information likely drive this early activation.
Raises questions about how word representations are structured during speech planning.