Calif. neuroscientist helps light up Hart’s shows

File-This Sept. 9, 2009 file photo shows Mickey Hart of the Grateful Dead performing at a memorial service for the late CBS News anchorman Walter Cronkite at the Lincoln Center in New York. Hart has a new piece of equipment accompanying him on his latest tour — a cap fitted with electrodes that capture his brain activity and direct the movements of a light show while he's jamming on stage. (AP Photo/Charles Dharapak, File)SAN FRANCISCO (AP) — Former Grateful Dead drummer Mickey Hart has a new piece of equipment accompanying him on his latest tour — a cap fitted with electrodes that capture his brain activity and direct the movements of a light show while he's jamming on stage.