Majority of studies on letter frequency effect failed to find a significant letter frequency effect.6 These studies, however, used the same-different matching task7 in which the participants see two letters and are to respond if these letters are same or different.8 Therefore, the absence of letter frequency effect in these studies may be due to the participants using the visual form of a letter instead of a letter itself to match the letters.9
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Egeth, H., & Blecker, D. (1971). Differential effects of familiarity on judgments of sameness and difference. Perception & Psychophysics, 9 (4), 321-326. ↩
Latimer, C. R. (1972). Search time as a function of context letter frequency. Perception, 1 , 57-71. ↩
Miozo, Michele & Bastiani, Pierluigi de (2002). The Organization of Letter-Form Representations in Written Spelling: Evidence from Acquired Dysgraphia. Brain and Language 80, 366–392 ↩
Appelman, I. B., & Mayzner , M. S. (1981). The letter-frequency effect and the generality of familiarity effects on perception.Perception & Psychophysics, 30, 436 – 446. ↩
Boris, New & Grainger, Johnatan (2011). On letter frequency effects. Acta Psychologica 138, 322 –328 ↩