CHICAGO (AP) — A neurosurgeon says Sen. Mark Kirk's prospects for a full physical recovery from a stroke that's affected his left side "are not great."But Northwestern Memorial Hospital's Dr. Richard Fessler said Monday that the Illinois Republican's chances for a full mental recovery are good. Fessler says Kirk's job is "cerebral" and he believes the functions required to do it "are going to be fine."The 52-year-old Kirk underwent surgery Sunday to alleviate pressure on his brain after doctors discovered he had a tear in his carotid artery and had suffered the stroke.Fessler says the stroke affected Kirk's ability to move his left arm, possibly his left leg and could cause paralysis of his face. But doctors say Kirk appears to recognize those around him and is responding to commands.