Education about sex is very important.

It's difficult to understand his mental state.

Deep emotion was reflected on her face.

His words were filled with deep feelings.

He is an expert in experimental psychology.

He is known as an expert in criminology.

She is majoring in clinical psychology.

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.