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We investigated the role of the visual similarity of masked primes to targets in a lexical decision experiment. In the primes, some letters in the target (e.g., A in ABANDON) had either visually similar letters (e.g., H), dissimilar letters (D), visually similar digits (4), or dissimilar digits (6) substituted for them. The similarities of the digits and letters to the base letter were equated and verified in a two-alternative forced choice (2AFC) perceptual identification task. Using targets presented in lowercase (e.g., abandon) and primes presented in uppercase, visually similar digit primes (e.g., 484NDON) produced more priming than did visually dissimilar digit primes (676NDON), but little difference was found between the visually similar and dissimilar letter primes (HRHNDON vs. DWDNDON). These results were explained in terms of task-driven competition between the target letter and the visually similar letter. [ABSTRACT FROM AUTHOR]

Reynolds and Besner (2005) examined contextual control over the use of lexical and nonlexical routes by requiring participants to alternate between reading pairs of low-frequency exception words and pairs of nonwords. Their main finding was that latencies for both words (e.g., wad) and nonwords (e.g.,flad) were slower when the immediately preceding trial involved the opposite item type rather than the same item type (a switch cost). The authors interpreted this result as evidence that under certain circumstances, readers have the ability to shift emphasis between their lexical and nonlexical routes. The present research shows that these results can be replicated using Reynolds and Besner's items; however, the switch cost for words, but not for nonwords, disappears when more easily named nonwords are used. This result suggests that Reynolds and Besner's results were likely due to something other than shifting route emphasis.