He or she may be categorized as having a slow-to-warm-up temperament.
Temperament, as used in psychology, broadly refers to consistent individual variances in behaviour that have biological roots and are mainly unrelated to learning, a set of guiding principles, or attitudes. A correlation between temperament and formal dynamical properties of behaviour, such as energetic aspects, flexibility, sensitivity to particular reinforcers, and emotionality, has been suggested by several researchers. Temperament traits (such as Neuroticism, Sociability, Impulsivity, etc.) are different patterns of behaviour that can be observed throughout a person's lifespan. Still, they are most apparent and extensively researched in young children. Although longitudinal research in the 1920s started to establish temperament as something that is consistent across the lifespan, temperament is often used to characterise babies.
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