A combination of psychophysical methods to limit the psycho-anatomical basis for such generalization (Julesz, 1972) and neurophysiological studies to limit the neural spatiotemporal correlates of learning (Bruns et al., 2011; van der Linden et al., 2011) will help to predict when such generalization occurs, given that spatiotemporal congruence appears to be at the core of multisensory integration and processing