Abstract
Confusion matrices were compiled for uppercase letters and for braille characters presented to observers in two ways: as raised touch stimuli and as visual stimuli that had been optically filtered of their higher spatial frequencies. These and other existing matrices were subjected to a number of analyses, including the choice model and hierarchical clustering. The strong similarity of the visual and tactile matrices from this study lends additional support to the claim that visual recognition of low-pass filtered characters, to a first approximation, can be taken as a model of tactile recognition of small two-dimensional raised patterns. Besides this, the analysis questions the widely held assumption that response bias contributes significantly to the stimulus-response contingencies in a character-recognition task.
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Brkitmeyer, B. G., &Ganz, L. Implications of sustained and transient channels for theories of visual pattern masking, saccadic suppression, and information processing.Psychological Review, 1976,83, 1–36.
Bükklen, K.Touch reading of the blind (F. K Merry, trans.). New York: American Foundation for the Blind, 1932.
Campbell, F. W., &Robson, J. G. Application of Fourier analysis to the visibility of gratings.Journal of Physiology (London), 1968,197, 551–566.
Carlson, C. R., &Heyman, P. M. A large format optical display for the generation of generalized visual stimuli.Vision Research, 1979,19, 99–103.
Craig, J. C. A confusion matrix for tactually presented letters.Perception & Psychophysics, 1979,26, 409–411.
Darian-Smith, I., &Renins, P. Innervation density of mechano-receptive fibers supplying glabrous skin of the monkey’s index finger.Journal of Physiology (London), 1980,309, 147–155.
Dixon, W. J., &Brown, M. B. (Eds.).Biomedical computer pro-grams: P-series. Los Angeles: University of California Press, 1977.
Gilmore, G. C, Hersh, H., Caramazza, A., &Griffin, J. Multidimensional letter similarity derived from recognition errors.Perception à Psychophysics, 1979,25, 425–431.
Ginsburg, A. P.Visual information processing based on spatial filters constrained by biological data. Doctoral dissertation, University of Cambridge, England, 1978.
Hubert, L., &Baker, F. B. Data analysis by single-link and complete-link hierarchical clustering.Journal of Educational Statistics, 1976,1, 87–111.
Johansson, R. S., &Vallbo, A. B. Tactile sensibility in the human hand: Relative and absolute densities of four types of mechanoreceptive units in glabrous skin.Journal of Physiology (London), 1979,286, 283–300.
Johnson, K. O., &Lamb, G. D. Neural mechanisms of spatial tactile discrimination: Neural patterns evoked by Braille-like dot patterns in the monkey.Journal of Physiology (London), 1981,310, 117–144.
Johnson, K. O., &Phillips, J. R. Tactile spatial resolution: I. Two-point discrimination, gap detection, grating resolution, and letter recognition.Journal of Neurophysiology, 1981,46, 1177–1191.
Johnson, S. C. Hierarchical clustering schemes.Psychometrika, 1967,32, 241–254.
Kikuchi, T., Yamashita, Y., Sagawa, K., &Wake, T. An analysis of tactile letter confusions.Perception & Psychophysics, 1979,26, 295–301.
Loomis, J. M. Tactile letter recognition under different modes of stimulus presentation.Perception & Psychophysics, 1974,16, 401–408.
Loomis, J. M. On the tangibility of letters and braille.Perception & Psychophysics, 1981,29, 37–46.
Luce, R. D. Detection and recognition. In R. D. Luce, B. R. Bush, & E. Galanter (Eds.),Handbook of mathematical psychology (Vol. 1). New York: Wiley, 1963.
Massaro, D. W., &Schmuller, J. Visual features, preperceptual storage, and processing time in reading. In D. W. Massaro (Ed.),Understanding language. New York: Academic Press, 1975.
McNemar, Q.Psychological statistics. New York: Wiley, 1962.
Nolan, C. Y., &Kederis, C. J.Perceptual factors in braille word recognition. New York: American Foundation for the Blind, 1969.
Phillips, J. R., &Johnson, K. O. Tactile spatial resolution: III. A continuum mechanics model of skin predicting mechanoreceptor responses to bars, edges, and gratings.Journal of Neurophysiology, 1981,46, 1204–1225.
Townsend, J. T. Theoretical analysis of an alphabetic confusion matrix.Perception & Psychophysics, 1971,9, 40–50.
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This research was supported by Grant 1 ROI NS15129 from Nincds
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Loomis, J.M. Analysis of tactile and visual confusion matrices. Perception & Psychophysics 31, 41–52 (1982). https://doi.org/10.3758/BF03206199
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DOI: https://doi.org/10.3758/BF03206199