This socially avoidant part of his personality would have caused him to withdraw from the trial.

BBC: Why did Fritzl change his mind?

In fact, in interviews to determine personality type, therapists consider short, concise answers to be a marker of an avoidant attachment style.

WSJ: What Makes People Overshare?

Avoidant people, about 15% of the population, try to minimize closeness.

WSJ: What Makes People Overshare?

But, he is obviously socially avoidant and anxious in social situations.

BBC: Why did Fritzl change his mind?

There are three basic attachment types: Secure, anxious and avoidant.

WSJ: What Makes People Overshare?

Avoidant cultures were negatively related to creativity.

FORBES: For Argument's Sake: Why Conflict Cultures Matter