He believes that he is an extra-sensory person.

His eyes are a deep blue.

It's difficult to understand his mental state.

He is an expert in experimental psychology.

He is known as an expert in criminology.

She is majoring in clinical psychology.

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

This lake is very deep.

His eyes were filled with deep sorrow.

He is known as a person with learning.