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Description: An investigation of individual differences in cognitive skills in relation to reader's eye movements. We examined eye movement patterns in response to reading sentences that contained an invisible boundary paradigm where a preview was replaced by a correct target word when an invisible boundary was crossed by the participant's gaze. Preview conditions: Identity, transposed letters, substituted letters. Language: English Abstract When a preview contains substituted letters (SL; markey) word identification is more disrupted for a target word (monkey), compared to when the preview contains transposed letters (TL; mnokey). The transposed letter effect demonstrates that letter positions are encoded more flexibly than letter identities, and is a robust finding in adults. However, letter position encoding has been shown to gradually become more flexible as reading skills develop. It is unclear whether letter position encoding flexibility reaches maturation in skilled adult readers, or whether some differences in the magnitude of the TL effect remain in relation to individual differences in cognitive skills. We examined 100 skilled adult readers who read sentences containing a correct, TL or SL preview. Previews were replaced by the correct target word when the reader’s gaze triggered an invisible boundary. Cognitive skills were assessed and grouped based on overlapping variance via Principal Components Analysis (PCA) and subsequently used to predict eye movement measures for each condition. Consistent with previous literature, adult readers were found to generally encode letter position more flexibly than letter identity. Very few differences were found in the magnitude of TL effects between adults based on individual differences in cognitive skills. The flexibility of letter position encoding appears to reach maturation (or near maturation) in skilled adult readers. Keywords: Transposed letter effect, Skilled Reading, Individual Differences, Individual Skills, Eye Movements Paper Published in PLOS ONE: https://doi.org/10.1371/journal.pone.0298351