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
Begg, I., &Denny, J. P. Empirical reconciliation of atmosphere and conversion interpretations of syllogistic reasoning errors.Journal of Experimental Psychology, 1969,111, 351–354.
Braine, M. D. S. On the relation between the natural logic of reasoning and standard logic.Psychological Review, 1978,85, 1–21.
Cohen, L. J. Can human irrationality be experimentally demonstrated?Behavioural and Brain Sciences, 1981,4, 317–370.
Dickstein, L. S. The effect of figure on syllogistic reasoning.Memory & Cognition, 1978,6, 76–83. (a)
Dickstein, L. S. Error processes in syllogistic reasoning.Memory & Cognition, 1978,6, 537–543. (b)
Dickstein, L. S. Inference errors in deductive reasoning.Bulletin of the Psychonomic Society, 1980,6, 414–416.
Dickstein, L. S. Conversion and possibility in syllogistic reasoning.Bulletin of the Psychonomic Society, 1981,18, 229–232.
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.
Ericsson, K. A., &Simon, H. A. Verbal reports as data.Psychological Review, 1980,117, 215–251.
Evans, J. St. B. T. Linguistic factors in reasoning.Quarterly Journal of Experimental Psychology, 1977,29, 297–306. (a)
Evans, J. St. B. T. Toward a statistical theory of reasoningQuarterly Journal of Experimental Psychology, 1977,29, 621–635. (b)
Evans, J. St. B. T. The psychology of deductive reasoning. London: Routledge & Kegan Paul, 1982.
Falmagne, R. J. (Ed.),Reasoning: Representation and process. Hillsdale, N.J: Erlbaum, 1975.
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.
Gorden, R. Attitudes toward Russia on logical reasoning.Journal of Social Psychology, 1953,37, 103–111.
Guyote, M. J., &Sternberg, R. J. A transitive-chain theory of syllogistic reasoning.Cognitive Psychology, 1981,13, 461–525.
Henle, M. On the relation between logic and thinking.Psychological Review, 1962,69, 366–378.
Henle, M., &Michael, M. The influence of attitudes on syllogistic reasoning.Journal of Social Psychology, 1956,44, 115–127.
Inhelder, B., &Piaget, J. The growth of logical thinking. New York: Basic Books, 1958.
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.
Janis, I., &Terwilliger, R. An experimental study of psychological resistances to fear arousing communications.Journal of Abnormal and Social Psychology, 1962,65, 403–410.
Johnson-Laird, P., &Steedman, M. The psychology of syllogisms.Cognitive Psychology, 1978,10, 64–99.
Kaufman, H., &Goldstein, S. The effects of emotional value of conclusions upon distortion in syllogistic reasoning.Psychonomic Science, 1967,7, 367–368.
Lefford, A. The influence of emotional subject matter on logical reasoning.Journal of General Psychology, 1946,34, 127–151.
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.
Morgan, J., &Morton, J. The distortion of syllogistic reasoning produced by personal convictions.Journal of Social Psychology, 1944,20, 39–59.
Nisbett, R. E., &Ross, L. Human inference: Strategies and short-comings of social judgment. Englewood Cliffs, N.J: Prentice-Hall, 1980.
Nisbett, R. E., &Wilson, T. D. Telling more than we can know: Verbal reports on mental processes.Psychological Review, 1977,14, 231–259.
Pollard, P. Human reasoning: Logical and nonlogical explanations. Unpublished doctoral thesis, Plymouth Polytechnic, 1979.
Pollard, P. Human reasoning: Some possible effects of availability.Cognition, 1982,12, 65–96.
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)
Revlin, R. Two models of syIlogistic reasoning: Feature selection and conversion.Journal of Verbal Learning and Verbal Behavior, 1975,14, 180–195. (b)
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.
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.
Revlin, R., &Mayer, R. E. (Eds.).Human reasoning. Washington, D.C: Winston-Wiley, 1978.
Siegel, S. Nonparametric statistics. New York: McGraw-Hill, 1956.
Wason, P. C., &Evans, J. St. B. T. Dual processes in reasoning?Cognition, 1975,3, 141–154.
Wilkins, M. The effect of changed material on ability to do formal syllogistic reasoning.Archives of Psychology, 1928,16, 83.
Wilson, W. The effect of competition on the speed and accuracy of syllogistic reasoning.Journal of Social Psychology, 1965,65, 27–32.
Winthrop, H. Semantic factors in the measurement of personality integration.Journal of Social Psychology, 1946,14, 149–175.
Woodworth, R. S., &Sells, S. B. An atmosphere effect in syllogistic reasoning.Journal of Experimental Psychology, 1935,18, 451–460.
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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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DOI: https://doi.org/10.3758/BF03196976
Keywords
- Irrelevant Information
- Syllogistic Reasoning
- Logical Validity
- Prose Passage
- Logic Interaction