Representations of feed-sideward modulation

To account for phenomena that occur when three or more rhythmic entities interact, called feedsidewards, models from engineering are considered as a possibly useful scaffolding from which to formulate tests of the mechanisms underlying such observations. Rhythms at different organizational levels and cephaloadrenal interactions are discussed. A description of an experiment involving the effects of light on mice is presented. Models for biological and biochemical rhythms are also discussed