This characteristic facial expression includes slightly narrowed brows, a curled upper lip, wrinkling of the nose and visible protrusions of the tongue, although different elicitors may produce different forms of this expression.This evidence indicates an innate biological basis for the expression and recognition of disgust.
Disgust is an emotional response of revulsion to something considered offensive, distasteful, or unpleasant.
In The Expression of the Emotions in Man and Animals, Charles Darwin wrote that disgust is a sensation that refers to something revolting.
For those especially sensitive to moral disgust, they would want to be less aggressive because they want to avoid hurting others.
Those especially sensitive to pathogen disgust might be motivated by a desire to avoid the possibility of an open wound on the victim of the aggression; however, for those sensitive to sexual disgust, some sexual object must be present for them to be especially avoidant of aggression.
Disgust may have an important role in certain forms of morality.
Pathogen disgust arises from a desire to survive and, ultimately, a fear of death.
In a series of significant studies by Paul Ekman in the 1970s, it was discovered that facial expressions of emotion are not culturally determined, but universal across human cultures and thus likely to be biological in origin.
The facial expression of disgust was found to be one of these facial expressions.
As mentioned earlier, women experience disgust more prominently than men. A dental phobia comes from experiencing disgust when thinking about the dentist and all that entails.