Automatic morpheme identification across development : Magnetoencephalography (MEG) evidence from fast periodic visual stimulation

Journal article


Pescuma, Valentina N, Ktori, Maria, Beyersmann, Elisabeth, Sowman, Paul F., Castles, Anne and Crepaldi, Davide. (2022). Automatic morpheme identification across development : Magnetoencephalography (MEG) evidence from fast periodic visual stimulation. Frontiers in Psychology. 13, pp. 1-13. https://doi.org/10.3389/fpsyg.2022.932952
AuthorsPescuma, Valentina N, Ktori, Maria, Beyersmann, Elisabeth, Sowman, Paul F., Castles, Anne and Crepaldi, Davide
Abstract

The present study combined magnetoencephalography (MEG) recordings with fast periodic visual stimulation (FPVS) to investigate automatic neural responses to morphemes in developing and skilled readers. Native English-speaking children (N = 17, grade 5–6) and adults (N = 28) were presented with rapid streams of base stimuli (6 Hz) interleaved periodically with oddballs (i.e., every fifth item, oddball stimulation frequency: 1.2 Hz). In a manipulation-check condition, tapping into word recognition, oddballs featured familiar words (e.g., roll) embedded in a stream of consonant strings (e.g., ktlq). In the experimental conditions, the contrast between oddball and base stimuli was manipulated in order to probe selective stem and suffix identification in morphologically structured pseudowords (e.g., stem + suffix pseudowords such as softity embedded in nonstem + suffix pseudowords such as trumess). Neural responses at the oddball frequency and harmonics were analyzed at the sensor level using non-parametric cluster-based permutation tests. As expected, results in the manipulation-check condition revealed a word-selective response reflected by a predominantly left-lateralized cluster that emerged over temporal, parietal, and occipital sensors in both children and adults. However, across the experimental conditions, results yielded a differential pattern of oddball responses in developing and skilled readers. Children displayed a significant response that emerged in a mostly central occipital cluster for the condition tracking stem identification in the presence of suffixes (e.g., softity vs. trumess). In contrast, adult participants showed a significant response that emerged in a cluster located in central and left occipital sensors for the condition tracking suffix identification in the presence of stems (e.g., softity vs. stopust). The present results suggest that while the morpheme identification system in Grade 5–6 children is not yet adult-like, it is sufficiently mature to automatically analyze the morphemic structure of novel letter strings. These findings are discussed in the context of theoretical accounts of morphological processing across reading development.

Keywordsmagnetoencephalography; fast periodic visual stimulation; morphological processing; automatic morpheme identification; reading development; English
Year01 Jan 2022
JournalFrontiers in Psychology
Journal citation13, pp. 1-13
PublisherFrontiers Media S.A.
ISSN1664-1078
Digital Object Identifier (DOI)https://doi.org/10.3389/fpsyg.2022.932952
Web address (URL)https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2022.932952/full
Open accessPublished as ‘gold’ (paid) open access
Research or scholarlyResearch
Page range1-13
Publisher's version
License
File Access Level
Open
Output statusPublished
Publication dates
Online07 Sep 2022
Publication process dates
Accepted08 Aug 2022
Deposited30 Jul 2024
Additional information

© Copyright, 2022, Pescuma, Ktori, Beyersmann,
Sowman, Castles and Crepaldi.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted,
provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
http://creativecommons.org/licenses/by/4.0/

Place of publicationSwitzerland
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https://acuresearchbank.acu.edu.au/item/90w3x/automatic-morpheme-identification-across-development-magnetoencephalography-meg-evidence-from-fast-periodic-visual-stimulation

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