- Attitude polarization
Attitude polarization, also known as belief polarization, occurs when people who have a belief or attitude interpret evidence for or against that belief/attitude selectively, in a way that shows a bias in favour of their current view. [Fine 2006a] If they are given evidence that agrees with their belief, they accept that it supports their position. If they are given evidence that contradicts their belief, they either ignore the evidence, criticise it, or reinterpret it so that it also supports their original view. According to Cordelia Fine, a Research Associate, at the Centre for Applied Philosophy and Public Ethics, belief polarisation can explain why we don't seek out views that challenge us. [Fine 2007] This apparent tendency is of interest to psychologists, but also to sociologists [Baldassarri & Bearman 2006] and philosophers. [Kelly 2007]
Psychological research on attitude polarization
Since the late 1960s, psychologists have carried out a number of studies on various aspects of attitude polarization.
The effects of prior theories on subsequently considered evidence
Charles Lord, Lee Rossand Mark Leppercarried out an important piece of research on attitude polarization. [Lord, "et al." 1979] The researchers selected two groups of people; one group was strongly in favour of capital punishment, the other group were strongly opposed to capital punishment. The researchers began by measuring the strength with which people held their particular position on the death penalty. Later, both the pro- and anti-capital punishment people were put into small groups and shown one of two cards, each of which had a statement about the results of a research project written on it. For example:
Kroner and Phillips (1977) compared murder rates for the year before and the year after adoption of capital punishment in 14 states. In 11 of the 14 states, murder rates were lower after adoption of the death penalty. This research supports thedeterrent effect of the death penalty. [Lord, "et al." 1979, p. 2100]or:
Palmer and Crandall (1977) compared murder rates in 10 pairs of neighboring states with different capital punishment laws. In 8 of the 10 pairs, murder rates were higher in the state with capital punishment. This research opposes the deterrent effect of the death penalty. [Lord, "et al." 1979, p. 2100]The researchers again asked people about the strength of their beliefs about the deterrence effect of the death penalty, and, this time, also asked them about the effect that the research had had on their attitudes.
In the next stage of the research, the participants were given more information about the study described on the card they received, including details of the research, critiques of the research, and the researchers' responses to those critiques. The participants' degree of commitment to their original positions were re-measured, and the participants were asked about the quality of the research and the effect the research information had on their beliefs.
Finally, the trial was rerun on all the participants using a card that supported the opposite position to that they had initially seen.
The researchers found that people tended to hold that research that agreed with their original views had been better conducted and was more convincing than research that conflicted with their original views. [Lord, "et al." 1979, pp. 2102, 2105-6.] Whichever position they held initially, people tended to hold that position more strongly after reading about research that supported their position. Lord "et al". point out that it is reasonable for people to be less critical of research that supports their current position, but it seems less rational for people to significantly increase the strength of their attitudes when they read supporting evidence. [Lord, "et al." 1979, pp. 2106-7.] When people had read both the research that supported their current views and the research that was conflicted with their views, they tended to hold their original attitudes "more" strongly than before they received that information. [Lord, "et al." 1979, pp. 2105-6.]
Attitude polarization and belonging to a group
Social psychologists have carried out research on the effect of seeing oneself as part of a group on one's attitude towards oneself, the group and positions supported or rejected by that group. [Cooper, "et al." 2004, pp. 252 ff.] To briefly summarise, the research suggests that people are likely to accept the position that they believe their group holds, even when they have only just been put into the group and have yet to meet any of the other group members. [Mackie and Cooper 1984]
Philosophy and attitude polarization
The tendency for attitude polarization to affect people's decisions when they are in groups has implications for political philosophy. [Sunstein 2002]
*wikicite|id=idBaldassarri2006|reference=Baldassarri, Delia, and Bearman, Peter (2006). [http://www.iserp.columbia.edu/research/working_papers/2006_07.html 'Dynamics of Political Polarization'.] "Working Paper" No. 2006 | 07. ISERP,
*wikicite|id=idCooper2004|reference=Cooper, Joel, Kelly, Kimberly A. and Weaver, Kimberlee (2004). 'Attitudes, Norms and Social Groups'. In Marilynn B. Brewer and Miles Hewstone, (eds.) "Social Cognition". Oxford:
Blackwell Publishing. ISBN-10: 1405110708, ISBN-13: 978-1405110709
*wikicite|id=idFine2006a|reference=Fine, Cordelia (2006a). "A Mind of its Own - How Your Brain Distorts and Deceives".
W. W. Norton. ISBN 0393062139
*wikicite|id=idFine2006b|reference=Fine, Cordelia (2006b). [http://www.guardian.co.uk/g2/story/0,,1694848,00.html 'The Vain Brain'.] An excerpt from Fine 2006a. In "
The Guardian", January 26, 2006.
*wikicite|id=idFine2007|reference=Fine, Cordelia (2007). [http://www.abc.net.au/rn/counterpoint/stories/2007/2046078.htm 'Empathy' on "Counterpoint", ABC Radio National. 1 October 2007]
*wikicite|id=idKelly2007|reference=Kelly, Thomas (2007). [http://www.princeton.edu/~tkelly/papers/Beliefpolarizationfinal.pdf 'Disagreement, Dogmatism, and Belief Polarization',] forthcoming in "The Journal of Philosophy".]
*wikicite|id=idLord1979|reference=Lord, Charles, Ross, Lee, and Lepper, Mark (1979). [http://www.psych.umn.edu/courses/spring07/borgidae/psy5202/readings/lord,%20ross%20&%20lepper%20(1979).pdf 'Biased Assimilation and Attitude Polarization: The Effects of Prior Theories on Subsequently Considered Evidence',] "
Journal of Personality and Social Psychology", 37 (11): 2098-2109.
*wikicite|id=idMackie1984|reference=Mackie, D.M. and Cooper, J. (1984). 'Group polarization: The effects of group membership'. "Journal of Personality and Social Psychology", 46: 575-585.
*wikicite|id=idSunstein2002|reference=Sunstein, Cass (2002). 'The Law of Group Polarization', "The Journal of Political Philosophy", 10 (2): 175-195.
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