Summary
Analyses of alphabetic confusion matrices have produced feature lists defined in terms of confusability of characters thought to contain them. Identical shapes of low confusability (e.g., b, d, p, q) therefore share few or no features. Several researchers have observed mutual inhibition of feature extraction with simultaneously presented confusable shapes. Mutual inhibition observed in the current experiments provides a basis for a definition of features in terms of orientation-independent structural relationships. In the first experiment, four alphanumeric characters were each confused with one other character in this same set; however, when another set was formed by reorienting some of these same shapes to become different characters (e.g., 6 to 9), these confusions disappeared. In the second experiment, characters within each set were exposed parafoveally in pairs to different groups of subjects. If members of a pair were similar in shape (disregarding orientation), identification accuracy was poorer than if they were not. Similar shapes in the same orientation were not signficantly more mutually inhibiting than similar shapes in different orientations.
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References
Bjork EL, Murray JT (1977) On the nature of input channels in visual processing. Psychol Rev 84:472–484
Blake J (1976) Parallel processing of position and form information in young children. Percept Psychophys 20:403–407
Bouma H (1971) Visual recognition of isolated lower-case letters. Vis Res 11:459–474
Estes WK (1972) Interactions of signal and background variables in visual processing. Percept Psychophys 12:278–286
Estes WK (1974) Redundancy of noise elements and signals in visual detection of letters. Percept Psychophys 16:53–60
Gibson EJ, Osser H, Schiff W, Smith J (1963) An analysis of critical features of letters, tested by a confusion matrix. In: A basic research program on reading. Cooperative Research Project No. 639, US Office of Education
Kinney GC, Marsetta M, Showman DJ (1966) Studies in display symbol legibility, Part XII. The legibility of symbols for digitalized television. ESD-TR-66-117. The Mitre Corporation, Bedford Mass
Krumhansl CL, Thomas EAC (1976) Extracting identity and location information from briefly presented letter arrays. Percept Psychophys 20:243–258
Krumhansl CL. Thomas EAC (1977) Effect of level of confusability on reporting letters from briefly presented visual displays. Percept Psychophys 21:269–279
Leitner EF (1978) Independent processing of letter location and identity information. Presented at the Nineteenth Annual Meeting of the Psychonomic Society in San Antonio, Texas
Rumelhart DE (1971) A multicomponent theory of confusion among briefly exposed alphabetic characters. CHIP 22. Center for Human Information Processing, University of California, San Diego
Rumelhart DE, Siple P (1974) Process of recognizing tachistoscopically presented words. Psychol Rev 81:99–118
Santee JL, Egeth HE (1980) Interference in letter identification: A test of feature specific inhibition. Percept Psychophys 27:321–330
Selfridge O (1959) Pandemonium: A paradigm for learning. In: Symposium on the mechanization of thought processes. HMSO, London
Townsend JT (1971) Theoretical analysis of an alphabetic confusion matrix. Percept Psychophys 9:40–50
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Chastain, G. Inhibition of feature extraction with multiple instances of the target feature in different orientations. Psychol. Res 43, 45–56 (1981). https://doi.org/10.1007/BF00309637
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DOI: https://doi.org/10.1007/BF00309637