Developmental Psychopathology and Normative Development
Core concepts
Developmental psychopathology examines how normative and atypical trajectories interact across development, and it is the conceptual spine of child assessment. Candidates must know equifinality (different pathways lead to the same outcome), multifinality (one risk factor leads to different outcomes), homotypic continuity (the same symptom persists) versus heterotypic continuity (the symptom expression changes with age, such as irritability in childhood becoming depression in adolescence), developmental cascades, risk and protective factors, differential susceptibility, and sensitive periods. Also know age-normative expectations: separation anxiety is normative in toddlerhood, parallel play in early preschool, and imaginary companions in early childhood.
Traps
Questions often test downward extension of adult criteria, pathologizing transient normative behavior, ignoring context and impairment, and confusing heterotypic continuity with discontinuity. Another trap is treating a single risk factor as deterministic; most outcomes are probabilistic and moderated by protective factors. Base rates matter: a behavior that is common at a given age is less likely to signal disorder.
Worked example / rule of thumb
Two children exposed to maternal depression: one develops anxiety, the other is resilient. That is multifinality. Two children with conduct problems-one through coercive family cycles, one through peer rejection-illustrate equifinality. Rule of thumb: same outcome, many pathways = equifinality; same risk, many outcomes = multifinality. Always ask: compared with what developmental expectation, in what context, with what functional impairment?