When left-handed mice live in right-handed worlds

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Science  17 Jan 1975:
Vol. 187, Issue 4172, pp. 181-184
DOI: 10.1126/science.1111097


Many C57BL/6J inbred mice were tested for paw preference. In unbiased worlds, approximately 10 percent exhibited lateral preferences inconsistent with the world bias, and males were more strongly lateralized. Influences of world bias appear to be superimposed upon an already laterally dichotomized population. Initial left-right sense, it is posited, arises as an outcome of a seemingly random process.