Should all potential Presidential candidates undergo a brain scan to determine if it is healthy? Seems like a no-brainer to me.

As a neuropsychiatrist and brain-imaging expert, I want our elected leaders to be some of the "brain healthiest people" in the land. How do you know about the brain health of a presidential candidate unless you look? The brain is involved in everything humans do: how we think, how we feel, how we get along with others, how we negotiate, how we pay attention in meetings and how we turn away the advances of White House interns or decide to invade a country based on contradictory intelligence.

Three of the last four presidents have shown clear brain pathology. President Reagan's Alzheimer's disease was evident during his second term in office. Nonelected people were covering up his forgetfulness and directing the country's business. Few people knew it, but we had a national crisis. Brain studies have been shown to predict Alzheimer's five to nine years before people have their first symptoms.

President Clinton's moral lapses and problems with bad judgment and excitement-seeking behavior -- indicative of problems in the prefrontal cortex -- eventually led to his impeachment and a poisonous political divisiveness in the U.S. The prefrontal cortex houses the brain's supervisor, involved with conscience, forethought, planning, attention span and judgment.

One could argue that our current president's struggles with language and emotional rigidity are symptoms of temporal lobe pathology. The temporal lobes, underneath your temples and behind your eyes, are involved with language, mood stability, reading social cues and emotional flexibility.

A national leader with brain problems can potentially cost millions of people their lives. Slobodan Milosevic and Saddam Hussein give us recent historical examples. Both of Milosevic's parents committed suicide, he had serious bouts of depression and reportedly drank heavily -- all signs that point to brain problems. He was found to be unreasonable and unreliable in negotiations and heartless as a political leader. Hussein was described as paranoid and without empathy, also symptoms pointing to poor brain function. His mother suffered severe bouts of depression and attempted suicide while pregnant with him, which is known to affect a baby's developing brain. He was physically and emotionally abused by his stepfather. All of these stresses must have been involved in shaping his paranoid brain into a mind that could torture dissenters, murder relatives and launch chemical attacks that killed thousands.

I think everybody can agree that this is an idea that is long overdue. (Would have kept Bush out for damn sure!) But I do have one concern about this.

I sort of think that any person seeking to be President almost assuredly has some brain malfunction to begin with. I mean this is not the desire of a completely sane person.

Half of the country will hate you, you will age at an alarming rate while holding office, you will be confronted with the most complicated problems imaginable, and everybody will second guess every single decision that you make.

I might want their brains scanned for severe pathologies, but we may have to let some dysfunction slide just to make sure we could get somebody to take the job.

I know I would not want it.