The head shake signifies a negative thought indicator. It’s as if the person can’t get past an idea. Babies use the headshake as in innate gesture to signal to their mother that they’ve had enough milk by turning their head away. The head shake is different from the typical “no type gesture” in that the head is tilted from side-to-side instead of being pivoted back and forth used to signify “no” in various cultures by adults. We should be skeptical if the head shake is given while voicing specifically agreeable language such as “You make a good point.” or “That sounds like a great idea.” These words, accompanied by the head shake, negates whatever positive words were voiced. It tells us that they were either trying to pull a fast one on us, or just trying to appease us.