乳児期の社会情緒的発達

Understanding socio-emotional development in infancy requires examining the foundational emotional and social elements present early in life, such as infant temperament.

Temperament refers to an individual's typical behavioral patterns and characteristic ways of responding. For infants, temperament primarily involves emotionality and reactions to environmental stimuli.

Stella Chess and Alexander Thomas identified three primary temperament types.

Firstly, an easy child is generally positive in mood, adapts quickly to routines, and adjusts easily to new experiences.

Secondly, a difficult child often fusses, cries frequently, and displays irregular daily routines.

Lastly, a slow-to-warm-up child exhibits low activity levels, tends to withdraw from unfamiliar situations, and shows caution when facing new experiences.

Additionally, infant temperament can be assessed across various high and low dimensions, such as effortful control or self-regulation, which controls arousal and avoids becoming easily agitated.

Inhibition is shyness and distress in new or unfamiliar settings, and negative affectivity is the tendency towards frustration or sadness.

Ultimately, these temperaments form the groundwork for later personality development.