VAST DATA INPUT. “If there are about 15 environmental factors acting in differing degrees and affecting the perception of each other then the combination of possible environments in which any individual can find itself and to which it must respond is enormous. Thus, the necessity for learning rather than rote behaviour. Moreover, long‐ and short‐term responses to environmental variables will be different.”
http://aob.oxfordjournals.org/content/92/1/1.full