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ERIC Number: ED138968
Record Type: RIE
Publication Date: 1977-Apr
Orthographic Regularity, Positional Frequency, and Visual Processing of Letter Strings. Report No. 413.
Massaro, Dominic W.; And Others
The studies reported here examined the role of orthographic regularity and summed positional frequency in the perception of letter strings. College sophomores and sixth graders were asked to indicate whether or not a target letter was present in a six-letter string. Orthographic regularity and summed positional frequency were found to have no effect on reaction time. In contrast, the number of letters in the catch string that were physically similar to the target letter had a large effect on reaction time. In another experiment, the letter string was presented for a period of short duration, followed immediately by a masking stimulus and then by the target letter. College readers indicated whether or not the target was present in the test string. Accuracy of performance was critically dependent on the orthographic regularity and summed positional frequencies of the letters in the test string. No effect of letter similarity was observed. The large differences that were observed between these two tasks can be accounted for in terms of the stages of processing that are critical for performance in the tasks. (Author/AA)
Publication Type: Reports - Research
Education Level: N/A
Sponsor: National Inst. of Education (DHEW), Washington, DC.
Authoring Institution: Wisconsin Univ., Madison. Research and Development Center for Cognitive Learning.