Species, endowed with an open-ended capacity for learning, which is one of the highest evolutionary achievements,will profit most from this ability, if they are urged one way or other to invest any surplus of energy in expanding and refining their behavioural repertoire and in adapting it to prevailing circumstances, while incurring as little risk and stress as possible.It is therefore argued that an open-ended capacity for learning is maximally adding to survival if paired to two distinct tendencies: a tendency to (...) seek high-arousal evoking situations whenever surplus energy is available, and a tendency to seek arousal reducing situations as soon as the surplus energy is exhausted.This suggests that a bi-stable “telic/paratelic” system of prefered levels of arousal, as described for humans by Apter & Smith's theory of motivational reversals, and as expressed in Kortmulder's model of the “centripetal/centrifugal” bi-polarity of animal behavioural tendencies, can be considered an Evolutionarily Stable Strategy , as compared to homeostatic systems of arousal and motivation. (shrink)

Classical ethology, with its emphasis on separability of parts, has largely failed to do justice to the wholeness of the individual animal, to the integrity of group behaviour and to the continuity between observable behaviour and consciousness. Field theory has potentialities to do better, as illustrated in this paper with reference to morphogenetic and behavioural fields. A behavioural domain is delineated — playlike behaviour — where field theory is particularly relevant. It is shown that the concept of symmetry can suggest (...) new questions as well as explain some generally known phenomena of group behaviour. New interpretations of displacement activities and of etho-ecological adaptations are offered, both of which involve the whole individual animal. (shrink)

The sociobiological fashion has for a long time discouraged the development of theories of the immediate causation of behaviour. It is only recently that new approaches are being developed to improve on the classical ethological theory originated by Lorenz and Tinbergen. One new departure is behavioural field theory (BFT) which brings back the concept of energy in behaviour, without being susceptible to the drawbacks of the energy or fuel concept of classical theory. In this paper the new theory is explained (...) in some detail and it is shown to be illuminating, predictive and testable in examples of play-like and territorial behaviour. (shrink)