红点测试：探寻自我意识

Theory of mind is the ability to understand others' thoughts and feelings independently of your own desires and knowledge. Self-recognition and self-awareness are necessary foundations for developing a mature theory of mind, enabling activities like giving compliments, working in groups, and understanding social dynamics. Without recognizing yourself as separate from others, you cannot fully grasp that others have different perspectives and knowledge.

The rouge test measures self-awareness because children's conceptual development exceeds their language mastery, making verbal assessments unreliable. Researchers adapted methods from animal self-recognition studies, using a mirror and brightly colored makeup to observe whether children recognize their own reflection and touch the mark on their actual forehead rather than the mirror image, providing a non-verbal measure of self-recognition.

Researchers covertly apply lipstick to a child's forehead, then place the child before a mirror while video recording their behavior. Children who touch the mark on their actual forehead pass, indicating self-awareness; those who only look at or touch the mirror reflection fail. Two independent coders watch videos and assign pass/fail scores, with inter-rater reliability determined using Cohen's kappa to ensure consistency.

Results show dramatic developmental differences: only a small percentage of 8- to 12-month-old infants passed the rouge test, while over 70% of 20- to 24-month-olds demonstrated self-awareness by reaching to examine the mark on their forehead. This progression indicates that self-recognition emerges and strengthens significantly during the second year of life, supporting the hypothesis that self-awareness improves with age.

As children develop self-awareness and basic theory of mind, they begin understanding how others feel, leading to empathy and complex social behaviors. Children learn to represent what others know and use this information to guide interactions, such as keeping secrets. They also engage in pretend play, which allows them to practice social skills independently and develop deeper understanding of social dynamics.

Self-awareness is not unique to humans. Researcher Gordon Gallup demonstrated that chimpanzees passed the rouge test, and many social animals including elephants and birds have shown the ability to recognize themselves and relate to others in complex social situations. This suggests that self-recognition evolved across multiple species with advanced social cognition.

Key considerations include ensuring the mirror is large enough for the child to see their full face clearly, using a brightly colored, washable, and skin-safe product like lipstick, and setting up video recording to capture the child's entire reflection. After data collection, using habituation studying infants before they can talk methods helps researchers assess non-verbal responses, and applying non-parametric statistics determines age group differences in self-awareness.