Nodding my head helps me pay attention.  

I am 100% more engaged when I’m in an audience and I sit close enough to make eye contact with the presenter. I also visibly nod when I agree with and understand the message and make one or two short notes that I’d like to think about later.

When I’m presenting, others making eye contact with me and visibly nodding, makes me feel 1000% more comfortable and confident.

Nodding helps create better presentations.  I reckon we should all nod more!