The brain with these regions lighting up most comes from a 73-year-old former guard with dementia and depression who suffered 20 concussions with short losses of consciousness, but one with a 12-hour coma.
The troubled opener was caught behind attempting to evade a short ball, although television replays showed the ball brushed the left-hander's arm guard rather than glove.
California Gov. Arnold Schwarzenegger said troops might provide short-term relief but he did not believe border protection was an appropriate role for the National Guard.
About 400 people signed up for the guard program this year, but fewer than 90 were needed because the season was so short, said April Dombrowski, another warden supervisor.