Temperament in AP Psychology

In AP Psychology, temperament is a person's innate, biologically based pattern of emotional, physical, and attentional reactivity and self-regulation. It shows up in infancy, and it illustrates heredity (nature) interacting with environment (nurture) to shape behavior.

What is Temperament?

Temperament is the emotional "default setting" you're born with. It covers how intensely you react to things (reactivity) and how well you calm yourself down or focus (self-regulation). Because it's biologically based, you can spot it in babies long before they've had much life experience. Some infants are calm and adaptable. Others cry hard at every new sound. Some hang back and take a while to get comfortable.

That last point is why AP Psych cares. Temperament is one of the clearest examples of heredity, which the CED describes as genetic or predisposed characteristics that influence behavioral and mental traits. But temperament isn't destiny. Caregivers, culture, and other environmental factors shape how that starting setting plays out. Think of temperament as the raw material, and experience as what builds it into a full personality.

Why Temperament matters in AP® Psychology

Temperament shows up in two places in the CED. In Unit 1 (Topic 1.1, Interaction of Heredity and Environment), it supports AP Psych 1.1.A, which asks you to explain how heredity and environment work together to shape behavior and mental processes. A baby's inborn reactivity is the "nature" piece, and family interactions are the "nurture" piece. In Unit 3 (Topic 3.6, Social-Emotional Development Across the Lifespan), it supports AP Psych 3.6.A, which asks how social development relates to behavior and mental processes. Here, temperament is the child's contribution to development. It affects how caregivers respond, how attachment forms, and how a kid handles peers and stress later on. The big exam theme is interaction. Development isn't just things happening to a child. The child's own biology pushes back on the environment too.

How Temperament connects across the course

Nature vs. Nurture and Adoption Studies (Unit 1)

Temperament is Exhibit A for the "nature" side, since it appears before experience has had much time to work. Adoption studies help sort it out. If adopted kids' reactivity resembles their biological parents more than their adoptive parents, that points to heredity. Still, the CED stresses that heredity and environment interact, so temperament is a starting point and not the whole story.

Attachment and the Strange Situation (Unit 3)

Temperament and attachment are tangled together. A highly reactive baby may cry harder during separation in the Strange Situation, and that's partly temperament, not just the quality of the caregiver bond. On the exam, ask yourself whether a behavior reflects the child's built-in reactivity or the relationship with the caregiver.

Parenting Styles and Ecological Systems (Unit 3)

A child's temperament shapes the microsystem around them. A difficult baby can stress parents and pull out different parenting behaviors than an easy baby would. So the arrow runs both ways. Parenting style influences the child, and the child's temperament influences the parenting.

Personality (Unit 4)

Temperament is the early, biological foundation that personality grows out of. A shy, slow-to-warm-up toddler might become a more introverted adult, but life experiences fill in the details. Temperament is the seed, and personality is the tree.

Is Temperament on the AP® Psychology exam?

Temperament usually appears in multiple-choice scenarios about infants and young children. Expect stems like "A researcher observes that during the Strange Situation procedure, a child shows minimal distress when the caregiver leaves... If this child has a difficult temperament characterized by high reactivity..." Questions like this test whether you can separate an inborn trait (temperament) from a relationship pattern (attachment style). Here's a useful clue. A highly reactive child who shows minimal distress is behaving against type, which points toward the attachment relationship and away from temperament as the explanation.

You'll also see temperament tucked into broader development questions about emotional regulation, prosocial behavior, and peer relationships. No released FRQ has used the term verbatim. Even so, it's a strong piece of evidence for any FRQ prompt asking you to explain how heredity and environment interact (1.1.A) or how early social development connects to later behavior (3.6.A). To use it well, name the biological predisposition, then explain how an environmental factor (a caregiver, parenting style, or culture) shapes the outcome.

Temperament vs Attachment Style

Temperament is something the child brings. It's an innate, biologically based level of reactivity. Attachment style is something that develops between the child and a caregiver, such as secure, avoidant, or anxious attachment, based largely on how responsive that caregiver is. A fussy baby has a difficult temperament. That same baby can still be securely attached if the caregiver responds consistently. On the exam, if the question is about the child's built-in reactivity, think temperament. If it's about the caregiver bond and reunion behavior, think attachment.

Key things to remember about Temperament

• Temperament is a person's innate, biologically based pattern of emotional reactivity and self-regulation, and it is visible in infancy.

• Temperament is a classic example of heredity (nature), but its effects are shaped by environmental factors (nurture) like family interactions, which ties it to AP Psych 1.1.A.

• Infants are often described as having easy, difficult, or slow-to-warm-up temperaments.

• Temperament is not the same as attachment style, because temperament comes from the child's biology while attachment style reflects the relationship with a caregiver.

• A child's temperament can influence how caregivers respond, so development is a two-way interaction between child and environment.

• Temperament is the early foundation of personality, but personality also depends on later experience.

Frequently asked questions about Temperament

What is temperament in AP Psychology?

Temperament is a person's innate, biologically based style of emotional, physical, and attentional reactivity and self-regulation. It appears in infancy and falls under Topic 1.1 (heredity and environment) and Topic 3.6 (social-emotional development).

Is temperament determined only by genetics?

No. Temperament is biologically based, but the CED emphasizes that heredity and environment interact. A reactive infant raised by patient, responsive caregivers may learn to regulate emotions well, so environment shapes how temperament shows up.

What is the difference between temperament and personality?

Temperament is the inborn emotional style you can see in babies. Personality is the broader, more complex set of traits that develops over time as temperament combines with experience. Temperament is the foundation, and personality is the finished building.

Does a difficult temperament mean a baby will be insecurely attached?

No. Temperament is the child's built-in reactivity, while attachment style depends heavily on caregiver responsiveness. A difficult baby can still form a secure attachment, which is why exam questions often ask you to separate the two.

What are the three types of temperament?

The three commonly taught categories are easy (calm, adaptable, positive mood), difficult (intense, irregular, quick to get upset), and slow-to-warm-up (cautious, low-key, slow to adjust to new situations). You may need to identify which category matches a described infant in an MCQ scenario.