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Updated: May 12, 2026
06:33
Decomposing the Variance in Reading Comprehension to Reveal the Unique and Common Effects of Language and Decoding
Published on: October 11, 2018
The unexplained nature of reading.
James S Adelman1, Suzanne J Marquis1, Maura G Sabatos-DeVito1
1Department of Psychology.
Summary
This study precisely measured word reading aloud speed, finding that word properties explain only a fraction of the variation. Current reading models may need revision to account for unexplained variance in word reading times.
Area of Science:
- Cognitive Psychology
- Psycholinguistics
- Computational Neuroscience
Background:
- Word properties significantly influence reading aloud response times (RTs), offering insights into the reading process.
- Accurately predicting RTs is crucial for understanding reading, but individual differences often obscure this precision.
Purpose of the Study:
- To precisely estimate the predictability of word reading aloud RTs by word properties, free from individual differences.
- To evaluate the explanatory power of current cognitive models of reading.
Main Methods:
- Collected precise RT data for 2,820 words read 50 times each by 4 participants.
- Estimated unexplained variance at the individual level to isolate the effects of word properties.
- Compared individual precision estimates with a 31-variable regression model.
Main Results:
- A sophisticated regression model, outperforming existing cognitive models, still left approximately two-thirds of meaningful word-level variance unexplained.
- Most systematic variance in word reading times could not be accounted for by known word properties.
Conclusions:
- Contemporary accounts of reading mechanisms at the word level may be incomplete.
- The substantial unexplained variance highlights limitations in current theoretical and computational models of reading.
- A precise, participant-level database is now available for future model assessments.
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