re: Monkeys Use Mind to Move Objects . . .
Nicolelis and colleagues first implanted microelectrodes -- each smaller than the diameter of a human hair -- into the brains of two female rhesus macaque monkeys named Aurora and Ivy.
One got 96 electrodes in her frontal and parietal lobes -- known to be the source of commands for muscular movement. The second monkey got 320 implants.
Ouch.
Rumor has it there was an incident where one scientist had to have emergency surgery when a monkey-controlled robot arm got a grip on his crotch. ;)