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Related Experiment Videos

Working memory in spelling: evidence from backward typing.

E Service1, R Turpeinen

  • 1University of Helsinki, Finland. elisabet.service@helsinki.fi

Memory (Hove, England)
|October 12, 2001
PubMed
Summary

This study explored spelling working memory limits by typing words backward. Results suggest the graphemic buffer handles about three letters at once, using different coding for short versus long words.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Linguistics

Background:

  • Spelling theories propose a working memory system, the graphemic buffer, for storing letter information.
  • Investigating the capacity limitations of this graphemic buffer is crucial for understanding spelling processes.

Purpose of the Study:

  • To explore the capacity limitations of the graphemic buffer during spelling.
  • To determine how word length and chunking strategies affect graphemic buffer usage.
  • To investigate the role of phonological and non-phonological coding in spelling.

Main Methods:

  • Participants typed words backward, with pauses indicating graphemic buffer refresh points.
  • Word length and chunking (two or three letters) were manipulated.
  • Articulatory suppression and foot tapping were used to assess coding strategies.

Main Results:

  • Major pauses occurred at syllable boundaries for longer words (seven to eight letters).
  • Performance on longer words was affected by articulatory suppression, but not foot tapping.
  • A chunk size of approximately three letters appears to be the limit for the graphemic buffer.

Conclusions:

  • The graphemic buffer has a limited capacity, handling roughly three letters at a time.
  • Short words may rely on non-phonological coding, while longer words utilize phonological codes.
  • These findings contribute to understanding the cognitive mechanisms underlying spelling.

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