in: The Cybernetics of Complex Systems - Self-organization, Evolution and Social Change, F. Geyer (ed.), (Intersystems, Salinas, California, 1991), p. 75-91. COGNITIVE LEVELS OF EVOLUTION: from pre-rational to meta-rational Francis Heylighen* PESP, Free University of Brussels, Pleinlaan 2, B-1050 Brussels, Belgium; E-mail:
[email protected] ABSTRACT: The principle of natural selection is taken as a tautological principle that stable (intrinsically and with starting point for an analysis of evolutionary levels. respect to the environment) systems tend to maintain, and Knowledge and values are conceived as vicarious selectors hence will be "naturally" selected (Heylighen, 1989b), of actions from a repertoire. The concept of metasystem whereas unstable systems will be eliminated. transition is derived from the law of requisite variety and the Each system is undergoing changes, either generated by principle of hierarchy. It is defined as the increase of variety internal processes, or by changes in the environment. at the object level, accompanied by the emergence of a Evolutionary selective systems will be those systems that situation-dependent control at a metalevel. It produces a new "survive" the changes, i.e. that maintain a continuous iden- level of evolution, with a much higher capacity for adapta- tity, even though their state may have changed. We will sup- tion. The most important levels are discussed, with an em- pose that the system is internally stable, i.e. that it is not phasis on the level characterizing man as distinct from the destroyed by its own internal processes. In that case, the animals. An analysis of the shortcomings of this "rational" system will have to cope with external changes, which might system of cognition leads to a first sketch of how the next perturb its internal organization, by adequate reactions.