Abstract
The main method used to study the role of features for letter recognition is that of generating letter confusion matrices (Bouma, 1971; Geyer & DeWald, 1973; Gilmore, Hersh, Caramazza, & Griffin, 1979; Roethlein, 1912; Sanford, 1888; Townsend, 1971; van der Heijden, Malhas, & van den Roovart, 1984). The data of a confusion matrix are an indirect but useful measure of interletter similarity. Yet, the confusion matrix method has various problems. First, the identification task may evoke response bias phenomena due to different guessing strategies (Bouma, 1971; Sanford, 1888). Second, the data matrix is often incomplete: Some letters are not confounded at all, and the empty cells in the matrix weaken its utility. Third, it is also known that different methods used to degrade viewing conditions and to produce a sufficiently high number of confusion errors lead to different patterns of confusions (Bouma, 1971; Garner & Haun, 1978; Geyer, 1977). For researchers interested in the dynamics of letter perception, a final inconvenience is, of course, that the data of a confusion matrix tell us nothing about the timecourse of feature extraction during letter and word recognition.
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References
Appelman, IB., &Mayzner, M. S.(1982). Application of geometric models to letter recognition: Distance and density.Journal of Experimental Psychology: General,111, 60–100.
Bouma, H. (1971). Visual recognition of isolated lowercase letters.Vision Research,11, 459–474
Garner, W. R., &Haun, F. (1978). Letter identification as a function of perceptual limitation and type of attributeJournal of Experimental Psychology: Human Perception & Performance,4, 199–209.
Geyer, LH (1977). Recognition and confusion of the lowercase alphabet.Perception & Psychophysics,22, 487–490.
Geyer, L. H., &Dewald, C. G. (1973). Feature lists and confusion matrices.Perception & Psychophysics,14, 471–482.
Gilmore, G C., Hersh, H., Caramazza, A., &Griffin, J. (1979). Multidimensional letter similarity derived from recognition errors.Perception & Psychophysics,25, 425–431.
Jacobs, A. M., &Levy-Schoen, A. (1988). Breaking down saccade latency into central and peripheral processing times in a visual dual task. In G. Luer, U Lass, & J. Shallo-Hoffman (Eds.),Eye movement research: Physiological and psychological aspects (pp 267–285) Göttingen, W. Germany: Hogrefe.
Korte, W. (1923). Über die Gestaltauffassung im indirekten Sehen.Zeitschrift für Psychologie,93, 17–82.
Krumhansl, C. L. (1982). Density versus feature weights as predictors of visual identifications: Comment on Appelman & Mayzner.Journal of Experimental Psychology. General,1, 101–108.
O’regan, J. K., Levy-Schoen, A., &Jacobs, A. M (1983). The effect of visibility on eye-movement parameters in reading.Perception & Psychophysics,34, 457–464.
Podgorny, P, &Garner, W. R (1979) Reaction time as a measure of inter- and intraobject visual similarity: Letters of the alphabet.Perception & Psychophysics,26, 37–52.
Roethlein, B. E.(1912). The relative legibility of different faces of printing types.American Journal of Psychology,23, 1–36.
Sanford, E. C (1888) The relative legibility of the small letters.American Journal of Psychology,1, 402–435.
Townsend, J. T. (1971).Theoretical analysis of an alphabetic confusion matrixPerception & Psychophysics,9, 40–50.
Treisman, A., &Gormican, S. (1988). Feature analysis in early vision. Evidence fromsearch asymmetries.Psychological Review,95, 15–48
Van Der Heijden, A. H. C, Malhas, M S. M., &Van Den Roovaart, B. P. (1984).An empirical interletter confusion matrix for continuous-Une capitals.Perception & Psychophysics,35, 85–88.
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This research was supported by a fellowship from the FYSSEN foundation (Paris) to the first author. We want to thank A. F. Sanders, on an earlier draft of this paper.
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Jacobs, A.M., Nazir, T.A. & Heller, O. Perception of lowercase letters in peripheral vision: A discrimination matrix based on saccade latencies. Perception & Psychophysics 46, 95–102 (1989). https://doi.org/10.3758/BF03208079
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DOI: https://doi.org/10.3758/BF03208079