He is known as an expert in criminology.

He has a deep interest in parapsychology.

Gestalt psychology is an important means to understand human cognitive processes.

He is known as a person with learning.

They (referring to women or girls) are my best friends.

I am majoring in psychology.

He is known as an expert in criminology.

He engaged in psychological warfare in the chess match.

He is a famous psychologist, influencing many people.

We conducted a psychological test in today's class.