The Face of Distaste: A Preliminary Study.

Area of Science:

• Psychology
• Evolutionary Biology
• Neuroscience

Background:

• Distaste is a primitive rejection response to toxic substances.
• Theoretical models propose distaste as the evolutionary precursor to physical and moral disgust.
• Facial expressions of distaste and disgust, particularly the upper lip raise, are debated.

Purpose of the Study:

• To investigate the upper lip raise in adult human responses to distasteful stimuli.
• To clarify the facial expression associated with distaste.
• To provide evidence for or against the evolutionary link between distaste and disgust.

Main Methods:

• A preliminary experiment involving 15 adult volunteers.
• Participants tasted unpleasant, pleasant, and neutral liquids.
• Facial expressions, specifically upper lip raise, were observed.

Main Results:

• Increased upper lip raising was observed for bitter and salty tastes compared to water and sweet tastes.
• This suggests the upper lip raise is a component of the distaste expression.
• Findings support the proposed evolutionary link between distaste and disgust.

Conclusions:

• The upper lip raise is a key facial expression associated with distaste.
• These findings align with the theory that disgust evolved from distaste.
• Further research can explore the neural and evolutionary underpinnings of these responses.