  Secondly, it is now known that neural localization for language is  very much a relative, rather than an all-or-nothing matter (Dronkers  et al. 2000, Dick et al. 2001, Martin 2003). Not only is language processing widely distributed over the brain (see Fig. 4), but traditionally language-specific areas of cortex are implicated in a variety of non-linguistic tasks as well. Broca's area, for instance, ‘lights up’ on MEG scans (magnetoencephalography, a method for measuring changes in the magnetic properties of the brain due to electrical activity) when subjects hear a discordant musical sequence in much the same way as it does when they hear an ungrammatical utterance. (Maess et al. 2001; a special issue of Nature Neuroscience, 6(7), July 2003, explores the implications of this finding.)