Remember This! - Losing Control (Part 2 of 3)

Losing grip on your memory is terrifying. The brutal memories that plague those with Post Traumatic Stress Disorder can revive the visceral emotions of traumas past. In part 2 of this series on the science of memory, BBC presenter Pam Rutherford explores why memory goes haywire during both PTSD and depression, and the important role emotions play in the machinations of your mind's memory vault.