Physics and Behavior

A rudimentary Physicist model of behavior is basic Behaviorism--all behavior is a response to a stimulus, i. e. is a reflexive effect of a cause.  Now, Spinoza's concept of Behavior introduces an analogue to Momentum--a principle of Persistence.  He further posits that an entity seeks to increase its strength, an event that in Sentimentalist models is known as experiencing Pleasure. But, the Physicist model offers no explanation for such a Conatus, i. e. seeking an increase in strength cannot be ascribed to Momentum, which only retains given strength.  So, the Physicist reduction of behavior, e. g. Einstein's Determinism, cannot be adequately derived from Spinoza's model.  Likewise weak is the standard Behaviorist concept.