Head Movement
In most cultures nodding one’s head is seen as agreeing.
Shaking one’s head is seem as rejecting, although Bulgarians do the opposite
They shake their heads when agreeing In southern India moving one’s head from side to side is not a negation .
Even in this area where most cultures agree, there is some disagreement.
A speaking may nod her head to affirm what she is saying and emphasize the verbal message. The listener may nod to signal understanding and approval. Nodding can be a signal that the listener understanding and that the speaker can continue with the discussion.