Inter-point interval (IPI) patterns. (a) Time between end of a point to correct lettern-1 and point to correct lettern as a function of whether the transition from lettern-1 to lettern crossed a word boundary (light blue) or was within a word (dark blue). Each dot represents an individual datapoint. Yellow lines show the medians, and red lines show the means. (7 of 350 between-word observations and 6 of 2417 within-word observations were slower than 4250 ms and are not shown.) (b) Individual model fits for each participant predicting IPI between consecutive points to correct letters within words, using as predictors the distance between those letters on the letterboard and how frequently they occur consecutively in English. Bigram frequency is shown as a median split but was a continuous variable in the linear mixed-effects analysis reported in the text. Shading represents 95% confidence intervals.