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Morphological decomposition and the reverse base frequency effect.

Marcus Taft1

  • 1School of Psychology, University of New South Wales, Sydney, Australia. m.taft@unsw.edu.au

The Quarterly Journal of Experimental Psychology. A, Human Experimental Psychology
|June 19, 2004
PubMed
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See all related articles

Morphological processing may involve obligatory decomposition. High base frequency words can be harder to recombine, counteracting stem frequency advantages and explaining absent base frequency effects.

Area of Science:

  • Psycholinguistics
  • Cognitive Science
  • Computational Linguistics

Background:

  • The frequency of a word's stem (base frequency) influences lexical decision-making.
  • Previous research shows base frequency effects inconsistently, leading to the dual-pathway model of morphological processing.
  • The dual-pathway model posits both word decomposition and whole-word access.

Purpose of the Study:

  • To investigate the obligatory decomposition account of morphological processing.
  • To explain the absence of base frequency effects under certain conditions.
  • To challenge the dual-pathway model by demonstrating an alternative explanation.

Main Methods:

  • Two experiments were conducted using lexical decision tasks.
  • Stimuli were controlled for surface frequency but varied in base frequency.

Related Experiment Videos

  • The role of the stem-affix recombination stage was analyzed.

    • Main Results:

    • High base frequency words showed slower recombination of stem and affix compared to low base frequency words when surface frequency was matched.
    • This recombination difficulty counterbalanced the advantage of higher stem frequency.
    • A reverse base frequency effect emerged when recombination was critical for word/non-word discrimination.

    Conclusions:

    • The obligatory decomposition model can account for the absence of base frequency effects.
    • The difficulty in recombining high base frequency words poses a challenge for the dual-pathway model.
    • Findings support an obligatory decomposition mechanism in morphological word recognition.