The human brain is one of the great mysteries of life - a remarkable feat of engineering and the seat of imagination, it's something we each possess, but that very few people understand. Dr Simon McMullan of the Department of Biomedical Sciences here at Macquarie, stops by for a chat about the key neurological insights from his research. From neuron activity and the regulation of blood pressure, to sufferers of post-traumatic stress disorder, Dr McMullan leads us through the fragile labyrinth of our brains.