In Peter Jackson's The Lord of the Rings: The Fellowship of the Ring, Aragorn notably makes a gesture where he places his hand on his forehead when he appears to be emotionally overwhelmed.
He does this in two scenes:
Upon reaching Lothlórien when the Fellowship first meets Galadriel and Celeborn
Shortly after the battle at Amon Hen
Was this gesture ever cited in the books or justified by Aragorn's character? Or is it merely something Viggo Mortensen and/or Peter Jackson improvised?