On the conflict between logic and belief in syllogistic reasoning

Abstract

Three experiments are reported that investigate the weighting attached to logic and belief in syllogistic reasoning. Substantial belief biases were observed despite controls for possible conversions of the premises. Equally substantial effects of logic were observed despite controls for two possible response biases. A consistent interaction between belief and logic was also recorded; belief bias was more marked on invalid than on valid syllogisms. In all experiments, verbal protocols were recorded and analyzed. These protocols are interpreted in some cases as providing rationalizations for prejudiced decisions and, in other cases, as reflecting a genuine process of premise to conclusion reasoning. In the latter cases, belief bias was minimal but still present. Similarly, even subjects who focus primarily on the conclusion are influenced to an extent by the logic. Thus a conflict between logic and belief is observed throughout, but at several levels of extent.

References

  1. Begg, I., &Denny, J. P. Empirical reconciliation of atmosphere and conversion interpretations of syllogistic reasoning errors.Journal of Experimental Psychology, 1969,111, 351–354.

    Article  Google Scholar 

  2. Braine, M. D. S. On the relation between the natural logic of reasoning and standard logic.Psychological Review, 1978,85, 1–21.

    Article  Google Scholar 

  3. Cohen, L. J. Can human irrationality be experimentally demonstrated?Behavioural and Brain Sciences, 1981,4, 317–370.

    Article  Google Scholar 

  4. Dickstein, L. S. The effect of figure on syllogistic reasoning.Memory & Cognition, 1978,6, 76–83. (a)

    Article  Google Scholar 

  5. Dickstein, L. S. Error processes in syllogistic reasoning.Memory & Cognition, 1978,6, 537–543. (b)

    Article  Google Scholar 

  6. Dickstein, L. S. Inference errors in deductive reasoning.Bulletin of the Psychonomic Society, 1980,6, 414–416.

    Google Scholar 

  7. Dickstein, L. S. Conversion and possibility in syllogistic reasoning.Bulletin of the Psychonomic Society, 1981,18, 229–232.

    Google Scholar 

  8. Erickson, J. A set analysis theory of behavior in formal syllogistic reasoning tasks. In R. L. Solso (Ed.),Theories of cognitive psychology: The Loyola Symposium. Hillsdale, N.J: Erlbaum, 1974.

    Google Scholar 

  9. Ericsson, K. A., &Simon, H. A. Verbal reports as data.Psychological Review, 1980,117, 215–251.

    Article  Google Scholar 

  10. Evans, J. St. B. T. Linguistic factors in reasoning.Quarterly Journal of Experimental Psychology, 1977,29, 297–306. (a)

    Article  Google Scholar 

  11. Evans, J. St. B. T. Toward a statistical theory of reasoningQuarterly Journal of Experimental Psychology, 1977,29, 621–635. (b)

    Article  Google Scholar 

  12. Evans, J. St. B. T. The psychology of deductive reasoning. London: Routledge & Kegan Paul, 1982.

    Google Scholar 

  13. Falmagne, R. J. (Ed.),Reasoning: Representation and process. Hillsdale, N.J: Erlbaum, 1975.

    Google Scholar 

  14. Feather, N. T. Acceptance and rejection of arguments in relation to attitude strength, critical ability and intolerance of inconsistency.Journal of Abnormal and Social Psychology, 1964,69, 127–36.

    Article  Google Scholar 

  15. Gorden, R. Attitudes toward Russia on logical reasoning.Journal of Social Psychology, 1953,37, 103–111.

    Article  Google Scholar 

  16. Guyote, M. J., &Sternberg, R. J. A transitive-chain theory of syllogistic reasoning.Cognitive Psychology, 1981,13, 461–525.

    Article  Google Scholar 

  17. Henle, M. On the relation between logic and thinking.Psychological Review, 1962,69, 366–378.

    PubMed  Article  Google Scholar 

  18. Henle, M., &Michael, M. The influence of attitudes on syllogistic reasoning.Journal of Social Psychology, 1956,44, 115–127.

    Article  Google Scholar 

  19. Inhelder, B., &Piaget, J. The growth of logical thinking. New York: Basic Books, 1958.

    Google Scholar 

  20. Janis, I., &Frick, P. The relationship between attitudes toward conclusions and errors in judging logical validity of syllogisms.Journal of Experimental Psychology, 1943,33, 73–77.

    Article  Google Scholar 

  21. Janis, I., &Terwilliger, R. An experimental study of psychological resistances to fear arousing communications.Journal of Abnormal and Social Psychology, 1962,65, 403–410.

    PubMed  Article  Google Scholar 

  22. Johnson-Laird, P., &Steedman, M. The psychology of syllogisms.Cognitive Psychology, 1978,10, 64–99.

    Article  Google Scholar 

  23. Kaufman, H., &Goldstein, S. The effects of emotional value of conclusions upon distortion in syllogistic reasoning.Psychonomic Science, 1967,7, 367–368.

    Google Scholar 

  24. Lefford, A. The influence of emotional subject matter on logical reasoning.Journal of General Psychology, 1946,34, 127–151.

    PubMed  Article  Google Scholar 

  25. Lord, C., Lepper, M. R., & Ross, L. Biased assimilation and attitude polarization: The effect of prior theories on subsequently considered evidence.Journal of Personality and Social Psychology, 1979,37.

  26. Morgan, J., &Morton, J. The distortion of syllogistic reasoning produced by personal convictions.Journal of Social Psychology, 1944,20, 39–59.

    Article  Google Scholar 

  27. Nisbett, R. E., &Ross, L. Human inference: Strategies and short-comings of social judgment. Englewood Cliffs, N.J: Prentice-Hall, 1980.

    Google Scholar 

  28. Nisbett, R. E., &Wilson, T. D. Telling more than we can know: Verbal reports on mental processes.Psychological Review, 1977,14, 231–259.

    Article  Google Scholar 

  29. Pollard, P. Human reasoning: Logical and nonlogical explanations. Unpublished doctoral thesis, Plymouth Polytechnic, 1979.

  30. Pollard, P. Human reasoning: Some possible effects of availability.Cognition, 1982,12, 65–96.

    PubMed  Article  Google Scholar 

  31. Revlin, R. Syllogistic reasoning: Logical decisions from a complex data base. In R. Falmagne (Ed.),Reasoning: Representation and process. Hillsdale, N.J: Erlbaum, 1975. (a)

    Google Scholar 

  32. Revlin, R. Two models of syIlogistic reasoning: Feature selection and conversion.Journal of Verbal Learning and Verbal Behavior, 1975,14, 180–195. (b)

    Article  Google Scholar 

  33. Revlin, R., &Leirer, V. The effects of personal biases on syllogistic reasoning: Rational decisions from personalized representations. In R. Revlin & R. E. Mayer (Eds.),Human reasoning. Washington, D.C: Winston-Wiley, 1978.

    Google Scholar 

  34. Revlin, R., Leirer, V., Yopp, H., &Yopp, R. The belief-bias effect in formal reasoning: The influence of knowledge on logic.Memory & Cognition, 1980,8, 584–592.

    Article  Google Scholar 

  35. Revlin, R., &Mayer, R. E. (Eds.).Human reasoning. Washington, D.C: Winston-Wiley, 1978.

    Google Scholar 

  36. Siegel, S. Nonparametric statistics. New York: McGraw-Hill, 1956.

    Google Scholar 

  37. Wason, P. C., &Evans, J. St. B. T. Dual processes in reasoning?Cognition, 1975,3, 141–154.

    Article  Google Scholar 

  38. Wilkins, M. The effect of changed material on ability to do formal syllogistic reasoning.Archives of Psychology, 1928,16, 83.

    Google Scholar 

  39. Wilson, W. The effect of competition on the speed and accuracy of syllogistic reasoning.Journal of Social Psychology, 1965,65, 27–32.

    PubMed  Article  Google Scholar 

  40. Winthrop, H. Semantic factors in the measurement of personality integration.Journal of Social Psychology, 1946,14, 149–175.

    Article  Google Scholar 

  41. Woodworth, R. S., &Sells, S. B. An atmosphere effect in syllogistic reasoning.Journal of Experimental Psychology, 1935,18, 451–460.

    Article  Google Scholar 

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Correspondence to J. St. B. T. Evans.

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The manuscript was prepared for publication while the first author was on sabbatical leave at the University of Florida.

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Evans, J.S.B.T., Barston, J.L. & Pollard, P. On the conflict between logic and belief in syllogistic reasoning. Memory & Cognition 11, 295–306 (1983). https://doi.org/10.3758/BF03196976

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Keywords

  • Irrelevant Information
  • Syllogistic Reasoning
  • Logical Validity
  • Prose Passage
  • Logic Interaction