He is a behaviouralist psychologist.

The behaviouralist conducted a study on human behavior.

Behaviouralists study human behavior and its impact on society.

He is a well-known behaviourist in the field of psychology.

Behaviourists study the behavior of animals.

He has a behaviouristic approach to psychology.

He is very well-behaved behaviourwise.

The behaviouremes of the children were quite different.

His behaviour is unacceptable.