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Why segmentation matters: Experience-driven segmentation errors impair "morpheme" learning.

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Summary
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Native language phonotactics can hinder adult second language learning. This study shows that conflicts with native phonotactics impede both word segmentation and morphological learning in new languages.

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Area of Science:

  • Linguistics
  • Psycholinguistics
  • Second Language Acquisition

Background:

  • Adult second language acquisition is complex.
  • Previous research indicated native language knowledge impacts word segmentation in a new language.
  • The influence of native language phonotactics on morphological learning remains less understood.

Purpose of the Study:

  • To investigate if native language phonotactics impede statistical learning in a new language beyond word segmentation.
  • To examine the effect of native-language word-form phonotactics on morpheme segmentation and phonologically triggered morphological variation.
  • To determine the cascading impact of native language knowledge on early and later stages of second language learning.

Main Methods:

  • Adult learners were exposed to an artificial language with specific phonotactic constraints.
  • The study manipulated the alignment between native-language phonotactics and morpheme boundaries in the artificial language.
  • Learners' ability to segment words into morphemes and learn phonological variations of these morphemes was assessed.

Main Results:

  • Second language learning was impaired when artificial language words and morphemes conflicted with native-language phonotactics.
  • Learning was not impaired when native-language phonotactics did not conflict with morpheme boundaries.
  • Native language phonotactic knowledge demonstrated a cascading effect on both word segmentation and morphological learning.

Conclusions:

  • Native language phonotactics significantly impact adult second language statistical learning.
  • Early success in word segmentation is crucial for acquiring more complex linguistic features like morphology.
  • Understanding phonotactic interference is key to addressing challenges in adult language acquisition.