As debates featuring Richard M. Nixon and former presidential candidate Al Gore have shown, sometimes movements speak louder than words. Nearly every politician knows that body language can be nearly as important as the message itself.

Crossed arms can be seen as a sign of aggression. Clasped hands can indicate humility. But what of the finger-to-the-mouth move?

The index finger seems to play a key role for many in politics, from Lt. Gov. Anthony G. Brown to state schools Superintendent Nancy S. Grasmick - perhaps as the go-to gesture for the thinking legislator.

Is the finger-to-the-mouth move a new trend in nonverbal politics?