How to I perform a head nod?

The head nod should be performed at a moderate speed, just like gesturing a very calm but deliberate ‘yes’ to communicate that you agree with another person. Start from a neutral head position, then dip the chin down to the chest, and come up again immediately. A movement that is too quick or too slow will not trigger the start. Bowing from the hips will not trigger the start. Avoid tipping the head backwards into extension.

An example how to perform the head nod to trigger the scan process.

An example how to perform the head nod to trigger the scan process.