[jwvideo id="radio2-44_emotional_brain_extra"]
Meet Matt Chaney. He's been diagnosed with pseudobulbar affect, a neurological condition which shows up in about one of three people with ALS or Lou Gehrig's disease. The result? Uncontrollable fits of laughter and crying that strike as often as three or four times a day. Watch Matt's episodes from the outside, and from within an fMRI machine, as scientists try to figure out how emotions play out in the human brain.