In contrast to amodal properties,arbitrary cross-modal relations are argued to be multisensory properties that specify information in a non-redundant way across the senses (e.g., therelation between the color of a car and the noise it makes). Some arbitrarycross-modal relations are preferred by infants and adults, and may beconsistent in the environment (e.g., the relation between visual height andauditory pitch).
See Amodal, Cross-modal coordination, Cross-modal matching, Developmental integration, Intersensory redundancy hypothesis