29 Pages Posted: 6 Feb 2008
Date Written: January 31, 2008
This paper reports the results of an experiment designed to test competing conjectures about the evolution of public attitudes toward nanotechnology. The rational enlightenment hypothesis holds that members of the public will become favorably disposed to nanotechnology as balanced and accurate information about it disseminates. The cultural cognition hypothesis, in contrast, holds that members of the public are likely to polarize along cultural lines when exposed to such information. Using a between-subjects design (N = 1,862), the experiment compared the perceptions of subjects exposed to balanced information on the risks and benefits of nanotechnology to the perceptions of subjects exposed to no information. The results strongly confirmed the cultural polarization hypothesis and furnished no support for the rational enlightenment hypothesis. Data obtained in the experiment also suggested that the observed correlation in the general public between familiarity with nanotechnology and a positive view of it is spurious: familiarity does not cause a favorable view; rather other influences, including individualistic cultural values, incline certain individuals both to form a positive view and to learn about nanotechnology. The paper also discusses the implications of these findings for promoting informed public understandings of nanotechnology.
Keywords: nanotechnology, cultural cognition, risk perception
Suggested Citation: Suggested Citation
Kahan, Dan M. and Braman, Donald and Slovic, Paul and Gastil, John and Cohen, Geoffrey L., The Future of Nanotechnology Risk Perceptions: An Experimental Investigation of Two Hypotheses (January 31, 2008). Harvard Law School Program on Risk Regulation Research Paper No. 08-24. Available at SSRN: https://ssrn.com/abstract=1089230 or http://dx.doi.org/10.2139/ssrn.1089230
By Dan Kahan