A 2-year-old repeatedly grabs toys from other children. When asked why, she cannot give a reason. Based on developmental research, this behavior is best described as:
AHostile aggression, because she is deliberately harming the other children by taking their toys
BInstrumental aggression, because the goal is obtaining the object rather than hurting the other child
CReactive aggression caused by temperamental deficits that predict later antisocial behavior
DNormative aggression that will persist at stable levels throughout childhood
Instrumental aggression is goal-directed — the harm to the victim is incidental to obtaining an object or outcome. A 2-year-old grabbing a toy wants the toy, not the other child's distress. Hostile aggression, by contrast, is motivated specifically by the intent to harm. This distinction matters developmentally because instrumental aggression peaks at 2–3 and declines sharply, while hostile aggression emerges later with the cognitive capacity to attribute intent to others.
Question 2 Multiple Choice
Why does the 'early-onset stable' trajectory of childhood aggression predict later antisocial outcomes more reliably than early aggression alone?
ABecause early aggression is neurologically hard-wired and cannot be modified by the environment
BBecause aggressive children are rejected by peers, which eliminates all opportunities to learn prosocial behavior
CBecause the same risk factors — temperamental reactivity, harsh parenting, peer rejection — tend to accumulate and reinforce each other over time
DBecause children who are aggressive at age 2 have fundamentally different brain structures than non-aggressive children
Early aggression predicts later outcomes not because it is destiny but because the risk factors that produce it tend to compound: a reactive child who learns aggression works, faces peer rejection, and receives harsh discipline exists in an escalating risk environment. The same risk cascade drives both the early aggression and later outcomes. Interventions at any point in this cascade can disrupt the trajectory, which would be impossible if early aggression were neurologically fixed.
Question 3 True / False
Instrumental aggression typically peaks around ages 2–3 and then declines as children develop language and social negotiation skills.
TTrue
FFalse
Answer: True
This developmental trajectory is well-established. Once children can express needs verbally and negotiate with peers, instrumental aggression — which serves goal-attainment — becomes less necessary as a social tool. The decline is driven by developing regulatory capacity and communication skills, not by children becoming less motivated to pursue goals. Hostile aggression, by contrast, tends to increase through the preschool years as theory of mind develops and children begin attributing intent to others.
Question 4 True / False
Children who display high levels of physical aggression in early childhood will almost certainly remain aggressive through adolescence and adulthood.
TTrue
FFalse
Answer: False
Research consistently shows that early aggression does NOT reliably predict adult aggression for most children. The largest developmental group shows low aggression across childhood. Many children who are aggressive at 2–3 substantially reduce their aggression by school age as regulatory capacity develops. Even the 'early-onset stable' group is not predestined — risk factors accumulate but are not deterministic. This misconception can lead to stigmatizing young children unnecessarily.
Question 5 Short Answer
What are the three main sources of individual differences in childhood aggression, and how do they interact to place some children at compounding risk?
Think about your answer, then reveal below.
Model answer: The three sources are temperament (baseline reactivity — some children are more easily frustrated and their arousal more readily tips into aggression), modeling (observational learning from aggressive adults or peers, which teaches aggression as a social script), and reinforcement history (if instrumental aggression succeeds at getting desired outcomes, it is reinforced and persists). These interact compoundingly: a highly reactive child who observes aggressive models and discovers that aggression works faces risk from all three directions simultaneously. Each factor amplifies the others — reactive children are harder to parent, provoking harsher discipline; peers reject aggressive children, reducing prosocial learning opportunities.
Interventions that break any link in this chain — teaching self-regulation, reducing exposure to aggressive models, or changing the reinforcement contingencies so aggression no longer succeeds — can interrupt the cycle. The multiplicative nature of these risks also explains why children with only one risk factor often show normal trajectories.