1
Robert Plomin is in the Institute of Psychiatry, Social, Genetic & Developmental Psychiatry Research Center, 111 Denmark Hill, London SE5 8AF, UK. r.plomin@iop.kcl.ac.uk
2
Stephen Kosslyn is in the Department of Psychology, Harvard University, William James Hall, 33 Kirkland Street, Cambridge, Massachusetts 02138, USA. smk@wjh.harvard.edu
By making maps of the differences in cortical gray matter volume between twins, Thompson et al. describe which brain regions are strongly determined by genetic factors; they further investigate how these brain differences correlate with measures of cognitive performance.
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