Topic: Conditioning

(<a href="http://www.shutterstock.com/gallery-109192p1.html">David Royal Hanson</a> <a href='http://www.shutterstock.com/gallery-306199p1.html'>nando viciano</a> via <a href='http://www.shutterstock.com/'>Shutterstock</a>)

A traumatic memory can be hard to shake

Jacek Debiec - The Conversation