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Processing Nasals with and without Consecutive Context Phonemes: Evidence from Explicit Categorization and the N100.

Heidrun Bien1, Pienie Zwitserlood

  • 1Institute for Psychology, Otto-Creutzfeldt Center for Cognitive and Behavioral Neuroscience, University of Münster Münster, Germany.

Frontiers in Psychology
|February 2, 2013
PubMed
Summary

German nasal processing is influenced by following sounds, showing early, pre-lexical phonetic categories are flexible. Assimilated nasals behave like standard nasals, not their assimilated form.

Keywords:
N100assimilationcontextnasalphonemesspeech perceptionunderspecification

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Area of Science:

  • Phonetics and Phonology
  • Psycholinguistics
  • Auditory Neuroscience

Background:

  • Understanding speech sound processing is crucial for linguistics and cognitive science.
  • Nasal sounds in German exhibit assimilation, where their place of articulation changes based on context.
  • Previous research often relies on lexical information, but pre-lexical processing remains key.

Purpose of the Study:

  • To investigate the pre-lexical processing of German nasal consonants (/n/, /m/, and assimilated /n'/).
  • To determine how following phonemes and their place of articulation affect nasal processing.
  • To examine the role of context in phonetic categorization and assimilation.

Main Methods:

  • Utilized neurophysiological measures (N100 event-related potentials) and explicit behavioral measures (two-alternative forced-choice categorization).
  • Employed speech stimuli excised from natural utterances, including isolated nasals and nasals followed by context phonemes.
  • Manipulated context phonemes for voicing and place of articulation relative to the nasal.

Main Results:

  • Explicit categorization showed assimilated /n'/ falling between /n/ and /m/.
  • /m/ elicited a higher N100 amplitude than /n/ and /n'/ in implicit processing, with no difference between the latter two.
  • Context phonemes significantly affected explicit categorization and early N100 processing, with assimilated /n'/ behaving like /n/.

Conclusions:

  • Results support the existence and early activation of pre-lexical phonetic categories.
  • Phonetic categories are flexible, accommodating assimilation by potentially ignoring inappropriate place cues.
  • Findings challenge models relying solely on lexical information for assimilation processes.