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Related Experiment Videos

Adaptive changes in grain-size in morphological processing.

Chang H Lee1

  • 1Department of Psychology, Sogang University, Shinsu-dong, Mapo-gu, Seoul 121-742, Korea. chleehoan@sogang.ac.kr

Journal of Psycholinguistic Research
|September 11, 2007
PubMed
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Skilled word recognition relies on processing words within their morpheme units. This study shows that morpheme boundaries limit how word recognition speed increases with repetition, suggesting unitization within, not across, these structures.

Area of Science:

  • Neurobiology
  • Cognitive Science
  • Psycholinguistics

Background:

  • Neurobiological evidence indicates a shift in the dominant cortical region for printed-word recognition from temporo-parietal (dorsal) to occipito-temporal (ventral) areas with increased experience.
  • These distinct neural circuits exhibit different response speeds and word preferences.
  • Prior research suggested that the 'grain-size' of word recognition processing increases with word repetition.

Purpose of the Study:

  • To investigate the role of morpheme boundaries in limiting the increase of grain-size during word recognition with repetition.
  • To determine if manipulating the visual representation of morphemic structure affects word recognition processing.

Main Methods:

  • Experimental manipulation of type font within words to either emphasize or disguise their morphemic structure.

Related Experiment Videos

  • Assessing the effect of word repetition on recognition, considering the influence of morpheme boundaries.

    • Main Results:

    • Morphemic structure significantly impacted word recognition, even after multiple repetitions.
    • The influence of morphemic structure diminished with extensive repetition, eventually becoming nonsignificant.
    • The spread of grain-size during word recognition does not readily cross morpheme boundaries.

    Conclusions:

    • Skilled word recognition speed is substantially achieved by unitizing letters within morphological units, rather than across them.
    • Morpheme boundaries act as constraints on the generalization of processing units during the development of reading expertise.