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How predictable is spelling? Developing and testing metrics of phoneme-grapheme contingency
Conrad Perry1, Johannes C Ziegler, Max Coltheart
1Marquarie Centre for Cognitive Science, Macquarie University, Sydney, Australia. conrad@currawong.maccs.mq.edu.au
Summary
This study developed new metrics for sound-spelling relationships, finding that skilled adult spelling depends on word position, morphology, and vowel type, not just simple frequency.
Area of Science:
- Cognitive Psychology
- Linguistics
- Psycholinguistics
Background:
- Previous research suggested infrequent phoneme-grapheme correspondences increase spelling difficulty.
- Defining phoneme-grapheme relationships is complex and involves various assumptions.
- The precise nature of sound-spelling contingency in word spelling remains debated.
Purpose of the Study:
- To develop and evaluate novel metrics of sound-spelling contingency.
- To test the psychological reality of these metrics against empirical spelling data.
- To identify key factors influencing skilled adult spelling.
Main Methods:
- Developed four distinct metrics of sound-spelling contingency for monosyllabic English words.
- Metrics varied in their assumptions about spelling conventions and complexity.
- Evaluated metrics using data from skilled adult spelling and a nonword spelling experiment.
Main Results:
- Skilled adult spellers demonstrate sensitivity to positional information within words.
- Morphological status significantly influences spelling accuracy and strategy.
- Vowel type and idiosyncratic constraints also play a role in spelling.
Conclusions:
- Simple frequency of phoneme-grapheme correspondences is insufficient to explain spelling difficulty.
- Spelling processes are complex, integrating multiple linguistic and positional cues.
- The developed metrics offer a more nuanced understanding of sound-spelling relationships in cognition.