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Updated: Jun 18, 2026

Observing the Transformation of Bodily Self-consciousness in the Squeeze-machine Experiment
Published on: March 8, 2019
The innate sense of the body develops to become a public affair by 2-3 years
1Department of Psychology, Emory University, Atlanta, GA 30322, USA. psypr@emory.edu
Insights
By age two, infants develop self-consciousness and a sense of possession, linking embodied self-awareness to social evaluation and the concept of "mine." This signifies a crucial developmental milestone in early childhood.
Area of Science:
- Developmental psychology
- Neuroscience
- Child development
Background:
- Infants possess an innate sense of their physical self as distinct from the environment.
- This implicit bodily self-awareness evolves into explicit, social self-concept.
- Maturation of prefrontal cortex regions is implicated in self-development.
Purpose of the Study:
- To explore the developmental trajectory of the embodied self from infancy to toddlerhood.
- To investigate the emergence of self-consciousness and its relation to social perception.
- To examine the parallel development of the sense of possession ('mine') with self-awareness.
Main Methods:
- Observational studies of infant and toddler behavior.
- Neuroimaging studies correlating brain maturation with self-related behaviors (inferred).
- Developmental assessments of self-recognition and possession behaviors.
Main Results:
- Infants' implicit sense of self becomes explicit and socially oriented by age two.
- Self-consciousness emerges as children perceive themselves through others' evaluations.
- The concept of 'mine' develops concurrently, extending the embodied self to include possessions.
Conclusions:
- The transition to self-consciousness around age two is a significant developmental leap.
- Social evaluation and the development of ownership are key components of this self-awareness transition.
- Understanding this developmental phase offers insights into early social cognition and brain development.
Abstract:
Infants from birth do express a sense of their own body as a differentiated entity among other entities in the world, an entity that is situated, physically bounded, organized, and agent in the environment. Quickly however, this implicit sense of self develops to become explicit, conceptual, and more importantly, public and social. This development would correlate with the maturation of specific prefrontal cortex regions. By 2 years of age, children begin to perceive and represent the embodied self through the evaluative, possibly coveting eyes of others. They become self-conscious. This developmental transition is further exemplified with the parallel emergence of an explicit sense of possession. By the second birthday, the "me" is extended to include the "mine", giving children new embodied power to share, exchange, and give.
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