What is the term for an individual's inherent emotional reactivity and intensity?

The term for an individual's inherent emotional reactivity and intensity is temperament. This concept refers to the biologically based aspects of personality that influence how a person experiences and expresses emotions. Temperament is typically viewed as a stable trait that can affect behavior and mood from early childhood throughout life. It encompasses characteristics such as emotional sensitivity, intensity of reactions, and general disposition towards emotional experiences.

Trust and mistrust refers to a concept related to attachment theory, particularly in the context of early childhood development and how caregivers' responsiveness can shape a child's sense of security.

Stability and change pertains to the dynamics of human development and the tension between maintaining certain traits over time while also undergoing transformations throughout life.

The zone of proximal development is a term introduced by psychologist Lev Vygotsky, describing the difference between what a learner can do without help and what they can achieve with guidance.

While each of these terms has its significance in the context of developmental psychology, temperament specifically addresses the innate emotional responses that define an individual’s personality from a young age.