Twenty-four braille readers in grades 4 to 12 performed a line-tracking task on tactile line graphs which differed in the type of raised line used to represent the data curve (continuous-interrupted, narrow-wide) and the nature of the display background (grid, no grid). A grid was found to impair the trackability of every line tested, despite high levels of discriminability between the test lines and the grid line. Line type and grade level had only marginal effects on tracking proficiency. Implications for the design of tactile line graphs for the blind are discussed.
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References
1.
Angwin, J.B.P.Maps for mobility-I. New Beacon, 1968 , 52, 115-119.
2.
Bentzen, B.L., & Peck, A.F.Factors affecting traceability of lines for tactile graphs. Journal of Visual Impairment & Blindness, 1979 , 73, 264-269.
3.
Berlá, E.P., Butterfield, L.H., Jr. , & Murr, M.Tactile political map reading by blind students: A videomatic behavioral analysis. Journal of Special Education , 1976, 10, 264-276.
4.
Berlá, E.P., & Murr, M.The effects of tactual noise on locating point symbols and tracing a line on a tactile pseudomap. Journal l of Special Education , 1975, 9, 183-190. (a)
5.
Berlá, E.P., & Murr, M.Psychophysical functions for active discrimination of line width by blind children. Perception & Psychophysics, 1975, 17, 607-612. (b)
6.
Easton, R.E., & Bentzen, B.L.Perception of tactile route configurations by blind and sighted observers . Journal of Visual Impairment & Blindness, 1980, 74, 254-265.
7.
Gill, J., & James, G.A study of the discriminability of tactual point symbols. American Foundation for the Blind, Research Bulletin, 1973 , No. 26, 19-34.
8.
Hollander, M., & Wolfe, D.A.Nonparametric statistical methods. New York: Wiley, 1973.
9.
James, G., & Gill, J.A pilot study on the discriminability of tactile area and line symbols for the blind. American Foundation for the Blind, Research Bulletin , 1975, No. 29, 23-31.
10.
Kirchner, C.Non-text reading matter: How should it be represented?Journal of Visual Impairment & Blindness, 1979, 73, 329.
11.
Nolan, C.Y., & Morris, J.E.Improvement of tactual symbols for blind children: Final Report. Louisville: American Printing House for the Blind, 1971.
12.
Wiedel, J., & Groves, P.Tactual mapping: design, reproduction, reading, and interpretation: Final report. College Park: University of Maryland, 1969.
13.
Winer, B.J.Statistical principles in experimental design. New York : McGraw-Hill, 1971.
