Two sets of evidence suggest that mirror neurons in the monkey have a role in action understanding. First, the activation of mirror neurons requires biological effectors such as the hand or mouth. Mirror neurons do not respond to actions undertaken by tools like pliers.
Two types of evidence indicate that mirror neurons in monkeys play a part in understanding actions. Initially, the activation of mirror neurons necessitates biological effectors such as hands or mouths. Mirror neurons do not react to actions carried out with tools like pliers.