Dear experts would you be kind and help me with this.

One of the most eminent of psychologists, Clark Hull, claimed that the essence of reasoning lies in the putting together of two ‘behavior segments’ in some novel way, never actually performed before, so as to reach a goal.


The main difficulty is the term "behavior segment", which is some kind of psychology jargon, apparently referring to a "unit of behaviour". In layman's terms, I suppose the general idea is that it is one individual "thing that one does". When we combine two (or more, I suppose) of these things together in a new way (new to us, I suppose), in order to achieve a desired result, then that's "reasoning".


Until we know what a behavior segment is, we can't know what he's trying to say. The quotation marks seem to mean that the term is defined elsewhere in the work.

 GPY's reply was promoted to an answer.