Have you considered that it might be the result of innate toy preference? It's pretty well established that the difference is innate (http://www.scribd.com/full

Have you considered that it might be the result of innate toy preference? It's pretty well established that the difference is innate (http://www.scribd.com/full/36579212?access_key=key-1ztjrngs92zr5fszbpve http://www.scribd.com/full/36579212?access_key=key-1ztjrngs9...), and it might have an influence on these early stories.