Neonates (newborns) display specific facial expressions almost immediately after birth, long before they have had significant social interaction or the cognitive ability to 'learn' complex social cues.
For example, newborns show a distinct 'disgust' face (wrinkled nose, curled lip) when presented with bitter tastes, which is interpreted as an innate survival mechanism to reject potentially toxic substances.
The presence of these expressions in the first hours of life suggests that the neural pathways for non-verbal communication are functional at birth.
| Feature | Innate Behaviours | Learned Behaviours (Display Rules) |
|---|---|---|
| Origin | Genetic/Evolutionary | Cultural/Socialization |
| Universality | Same across all humans | Varies by culture and group |
| Purpose | Survival and basic expression | Social harmony and etiquette |
| Example | Smiling when genuinely happy | Masking sadness at a formal event |
Identify the Evidence Type: When asked about innate behaviour, categorize your answer into three pillars: Cross-cultural (universality), Sensory deprivation (blind/deaf studies), and Neonatal (newborn studies).
Focus on 'Why': Don't just state that blind children smile; explain that because they cannot observe others, the behaviour must be biological rather than imitative.
Avoid Overgeneralization: Do not claim all non-verbal behaviour is innate. Hand gestures (like the 'thumbs up') are often culturally learned, whereas facial expressions of emotion are typically innate.
Check for Evolutionary Logic: If a behaviour is innate, it usually has a survival benefit (e.g., baring teeth in anger to ward off threats).