Alzheimer's discovery

that extend well beyond our conception of normal and disordered musical processing. It provides a model that can be used to ask how potential changes at the genetic level impact upon brain structure function and, ultimately, behaviour. If amusia can be thought of as a disorder of connectivity, one might hypothesize that those genes which encode fibre tracking proteins will be found to be atypical. Though speculative at present, any such finding could shed light on a number of other developmental disorders. Though different development disorders are very different at the behavioural level, it remains possible that they are underpinned by a similar genetic mechanism operating at a different locus and/or at a different points during the developmental trajectory.