Check out Matt’s recent paper in JML on frequency and plausibility effects on eye movements, which features an introduction to hypothesis testing with Bayes factors:

Abbott, M. J., & Staub, A. (2015). The effect of plausibility on eye movements in reading: Testing EZ Reader’s null predictions. Journal of Memory and Language, 85, 76-87.

For more detail on Bayes factor, here are Matt’s slides from a talk given at the UCSD Computational Psycholinguistics Lab: Talk slides.