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Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
Published on: May 12, 2019
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Automatic morpheme identification across development: Magnetoencephalography (MEG) evidence from fast periodic visual
Valentina N Pescuma1, Maria Ktori1, Elisabeth Beyersmann2,3
1Cognitive Neuroscience, International School for Advanced Studies (SISSA), Trieste, Italy.
Frontiers in Psychology
|September 26, 2022
Summary
Developing readers show automatic morpheme processing, but differently than skilled adults. Children focus on stems, while adults identify suffixes, indicating a maturing system for analyzing novel words.
Area of Science:
- Cognitive Neuroscience
- Developmental Psychology
- Linguistics
Background:
- Understanding how the brain processes word structure (morphology) is key to reading development.
- Automatic neural responses to morphemes may differ between developing and skilled readers.
- Fast periodic visual stimulation (FPVS) offers a method to probe these automatic responses.
Purpose of the Study:
- To investigate automatic neural responses to morphemes in developing (5th-6th grade) and skilled adult readers.
- To compare how children and adults process word stems versus suffixes.
- To explore the maturity of morphological processing in developing readers.
Main Methods:
- Magnetoencephalography (MEG) recordings combined with FPVS.
- Participants viewed rapid streams of visual stimuli with periodic oddballs.
- Stimuli included consonant strings, familiar words, and morphologically structured pseudowords (stems and suffixes).
Main Results:
- Both children and adults showed word-selective neural responses.
- Children exhibited a stem-selective response in central occipital sensors.
- Adults demonstrated a suffix-selective response in central and left occipital sensors.
Conclusions:
- The morpheme identification system in 5th-6th graders is not fully adult-like but can automatically analyze novel word structures.
- Developing readers show a bias towards stem identification, while skilled readers prioritize suffix identification.
- Findings contribute to understanding the developmental trajectory of morphological processing in reading.
