His voice was filled with deep sadness.

People who are not well-informed find it difficult to use internet information appropriately.

This history book contains detailed information about the era of barbarian affection.

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.

His nature is very kind.

Detailed information is needed to understand the nature of that project.