THE LANCET Neurology Vol 1 June 2002 http://neurology.thelancet.com 80 If you respond to the question “what is apathy?” by saying “I don’t know and I don’t care”, you’ve got the correct answer. But if you didn’t get this joke, you may be suffering from impaired humour appreciation, according to research presented at this year’s Rotman Research Institute Conference (Toronto, ON, Canada; March 25...