Impaired Recognition of Traffic Signs in Adults With Dyslexia

Abstract

Ten adults with dyslexia (4 women and 6 men, mean age: 26.8 years, range: 19–43 years) and 11 controls (5 women and 6 men, mean age: 20.5 years, range: 18–29 years) were tested on their ability to differentiate between real and false traffic signs. The stimuli, computer-presented color pictures, were chosen to minimize the applicability of verbal or written linguistic skills to the task. The adults with dyslexia recognized the traffic signs significantly less well than did the controls. Furthermore, whereas for the controls there was a significant correlation between traffic sign recognition and driving experience, no such correlation was found for the adults with dyslexia. The results are interpreted in terms of a deficit in implicit learning.

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References

Bradley, L. , & Bryant, P. E. Difficulties in auditory organization as a possible cause of reading backwardness. Nature, 1978, 271, 746–747.

De Gelder, B. , & Vroomen, J. Phonological deficits: Beneath the surface of reading-acquisition problems. Psychological Research, 1991, 53, 88–97.

Elliott, C. D. (1992). British ability scales-Spelling scale. Windsor, England: NFER-Nelson.

Fawcett, A. J. , & Nicolson, R. I. (1993). Children with dyslexia show deficits in most primitive skills. In W. Kintsch (Ed.), Proceedings of the 15th annual conference of the Cognitive Science Society (pp. 422–427). Hillsdale, NJ: Erlbaum.

Finucci, J. M. , Guthrie, J. T. , Childs, A. L. , Abbey, H. , & Childs, B. The genetics of specific reading disability. Annals of Human Genetics, 1976, 50, 1–23.

Jorm, A. F. , Share, D. L. , McLean, R. , & Matthews, D. Cognitive factors at school entry predictive of specific reading retardation and general backwardness: A research note. Journal of Child Psychology and Psychiatry and Allied Disciplines, 1986, 27, 45–54.

Lovegrove, W. (1994). Visual deficits in dyslexia: Evidence and implications. In A. J. Fawcett & R. I. Nicolson (Eds.), Dyslexia in children: Multidisciplinary perspectives (pp. 113–136). London: Harvester Wheatsheaf.

Lovegrove, W. J. , Garzia, R. P. , & Nicholson, S. B. Experimental evidence of a transient system deficit in specific reading disability. Journal of the American Optometric Association, 1990, 61, 137–146.

McNicol, D. M. (1972). A primer in signal detection theory. London: George Allen & Unwin.

10.

Nicolson, R. I. , & Fawcett, A. J. Automaticity: A new framework for dyslexia research. Cognition, 1990, 35, 159–182.

11.

Nicolson, R. I. , & Fawcett, A. J. (1993). Towards the origins of dyslexia. In S. F. Wright & R. Groner (Eds.), Facets of dyslexia and its remediation (pp. 371–392). Amsterdam: Elsevier.

12.

Nicolson, R. I. , & Fawcett, A. J. (1994). Reaction times and dyslexia. Quarterly Journal of Experimental Psychology, 47A, 29–48.

13.

Nicolson, R. I. , Fawcett, A. J. , & Miles, T. R. (1993). Feasibility study for the development of a computerized screening test for dyslexia in adults (Report No. OL176). Sheffield: Employment Department.

14.

Olson, R. K. , Gillis, J. J. , Rack, J. P. , DeFries, J. C. , & Fulker, D. W. Confirmatory factor analysis of word recognition and process measures in the Colorado reading project. Reading and Writing, 1991, 3, 235–248.

15.

Stanovich, K. E. Matthew effects in reading: Some consequences of individual differences in the acquisition of literacy. Reading Research Quarterly, 1986, 16, 32–71.

16.

Stein, J. F. Visuospatial perception and reading problems. Irish Journal of Psychology, 1989, 10, 521–533.

17.

Stein, J. F. (1994). A visual defect in dyslexics? In A. J. Fawcett & R. I. Nicolson (Eds.), Dyslexia in children: Multidisciplinary perspectives (pp. 137–157). London: Harvester Wheatsheaf.

18.

Thomson, M. E. (1984). Developmental dyslexia: Its nature, assessment and remediation. London: Edward Arnold.

19.

Vellutino, F. R. (1979). Dyslexia: Theory and research. Cambridge, MA: MIT Press.