ABSTRACT
Experimental evidence demonstrates intensive and extensive interactions between the nervous and immune systems.
The central capacity of associating a certain immune response or status (allergen, toxin, antigen) with a specific stimulus (environment or flavor) seems to be of high adaptive value; this special kind of associative learning may have been acquired as an adaptive strategy during evolution in order to protect an organism and/or prepare it for danger. Furthermore, it is possible that, depending on the different environmental challenges, the species formed speciesspecific associations during evolution.
