chapter 14 Middle and Late Childhood Mental Health: Externalising & Internalising Disorders

Developmental Context: Middle & Late Childhood

• Core developmental challenges

  • Adapting to rising school demands, negotiating peer pressures, and gradually separating from parental dependence.

  • These stressors can trigger or exacerbate emotional/behavioural problems.

• Key vulnerability

  • Psychosocial, emotional, and behavioural disorders can disrupt normative development if severe/persistent.

Epidemiology & Scope

• General prevalence

  • $\approx20\%$ (1 in 5) of children/youth exhibit at least one diagnosable mental health disorder (Kessler et al., 2005).

  • $\approx10\%$ experience disorders severe enough to impair daily functioning.

• Recent national surveillance (NSCH & other datasets)

  • Depression, anxiety, and conduct problems are most common (Bitsko et al., 2019; Ghandour et al., 2019; Danielson et al., 2020).

  • School-based screenings (4 schools, U.S. sample) showed 15–33 % met full diagnostic criteria for an emotional/behavioural disorder.

• Long-term cost

  • Untreated childhood disorders predict adverse adult outcomes: unemployment, substance misuse, criminal involvement, reduced quality of life (National Academies, 2019).

Major Diagnostic Categories

1. Externalising (Disruptive) Disorders

• Definition: outward-directed behaviours harming or impacting others (anger, aggression, rule-breaking).

• Common labels: Oppositional Defiant Disorder (ODD), Conduct Disorder (CD), Bullying (when not pervasive enough for CD).

1.1 Oppositional Defiant Disorder (ODD)

• DSM-5 core features (APA, 2013, p. 463)

  • Angry/irritable mood, argumentative/defiant behaviour, vindictiveness.

  • Persistence/frequency exceeds developmental norms.

• Typical presentation

  • Non-compliance with adult requests, temper outbursts, refusal, verbal hostility.

  • Example (Case 14.1 “Alberto”): 10-y-o, 5′7″, 130 lb, public tantrums & threats when denied candy.

• Etiology

  • Patterson’s Coercive Cycle (1982): child misbehaves → parent denies → child escalates aggression → parent threatens inconsistently → ultimately gives in → defiance reinforced.

• Interventions

  • Parent Management Training (PMT) — robust evidence base (Preston & Ebert, 1998; NICE, 2017).

  • Teach positive reinforcement, consistent non-coercive discipline, relationship-building skills.

  • Child-focused CBT — e.g., Treatment Program for Children with Aggressive Behaviour (Thornton et al., 2019): social-cognitive restructuring, impulse control, social skills.

1.2 Conduct Disorder (CD)

• DSM-5 definition (APA, 2013, p. 469)

  • Repetitive/persistent behaviour violating rights of others or major norms.

• Symptom clusters

  • Aggression toward people/animals, property destruction, deceit/theft, serious rule violations (truancy, running away).

• Subtypes

  • Early-onset (<10 y): worse prognosis; links to school failure, dropout, later Antisocial Personality Disorder (Beliveau-Walker et al., 2018).

  • Late-onset (≥10–13 y): relatively better outlook if intervened.

• Typical features

  • Low empathy, hostile attribution bias, blame externalisation, low self-esteem.

  • Case 14.2 “Germaine”: severe animal cruelty, impulsivity, no remorse; prenatal exposure to cocaine/meth, abuse (beatings, cage confinement).

• Risk factors

  • Genetics (twin/adoption: Moffitt, 2005), frontal-lobe executive dysfunction (Hobson et al., 2011).

  • Parenting styles: violent, inconsistent, permissive, low monitoring, reinforcement of negative behaviour (Barker & Anthonys, 2009).

• Interventions

  • Multimodal: CBT for anger & problem solving (McLochlin & Crystal, 2001) + PMT (Serketich & Dumas, 1996).

  • Goals: short-term symptom reduction, long-term prevention of escalation to ASPD.

1.3 Bullying

• Definition: repeated, intentional aggression (physical, verbal, relational, cyber) against a less powerful peer; may meet CD criteria if pervasive.

• Prevalence

  • $\approx20\%$ of 12–18-y-o students report victimisation; highest in grades 6–8 (U.S. Dept. of Ed., 2020).

• Motives (Basak et al., 2006; Thomas et al., 2018)

  • Instrumental (gain possessions/status) or for entertainment/dominance.

• Profiles & Correlates (Cook et al., 2010)

  • Bullies: externalising traits, low affective empathy, moral disengagement.

  • Environmental: abuse, neglect, inconsistent discipline, family aggression (Lereya et al., 2013).

  • Case 14.3 “Buchi”: large 11-y-o uses intimidation to get treats, pens; peer mixed reactions.

• Interventions

  • Individual: empathy training (Maricloose et al., 2016); anger management (Hudson, 2018).

  • Victims: social skills, assertiveness, coping, suicide risk monitoring (Al-Yousef et al., 2019).

  • Systemic: parental supervision, non-coercive discipline, positive school climate.

  • Menard & Grotpeter (2014) “Bully-Proof” program: 7-session curriculum + bystander activation.

  • Olweus Bullying Prevention Program: 30–70 % reduction when fully implemented (Olweus, 2013; Blueprints).

2. Internalising Disorders

• Definition: inward-focused distress (somatic complaints, withdrawal, anxiety, depression).

• Salience

  • Often unnoticed due to quiet presentation; yet chronic, linked to cognitive & relational deficits (Bub et al., 2007; Klima & Repetti, 2008).

2.1 Anxiety Disorders

• Prevalence: 7–15 % of <18 y-o (Merrikangas et al., 2010).

• Common subtypes in childhood

  • Separation Anxiety Disorder: fear when away from attachment figures; anticipates harm/loss.

  • Social Anxiety Disorder: fear of rejection/humiliation; often mislabelled “shy.” Prevalence $\approx 1\%$ but under-identified (Rhodes & Donnelly, n.d.).

  • Generalised Anxiety Disorder (GAD): excessive, uncontrollable worry across domains; symptoms include restlessness, concentration problems, somatic complaints.

• Risks & maintenance

  • Limited emotion regulation skills (Kim-Spoon et al., 2013).

  • Peer victimisation & rejection (La Fontana & Oberme, 2006).

  • Parental overprotection, anxiety modelling.

• Interventions

  • CBT components: psychoeducation, exposure, somatic management, cognitive restructuring, contingent reinforcement (Higa-McMillan et al., 2016).

  • Limitations: very young children may lack meta-cognitive capacity → use family-based CBT (Kerns et al., 2017; Comer et al., 2019).

2.2 Depression

• Prevalence: $\approx2$ million U.S. children (3–17 y) meet criteria (Ghandour et al., 2019).

• Phenomenology

  • Symptoms differ from adults: irritability, agitation, somatic complaints, school decline, withdrawn play (Table 14.2).

  • High suicide risk (Houghton & Van Geuren, 2009).

  • Example (Case 14.4 “Larissa”): 9-y-o, withdrawal, insists peers dislike her, irritability, maternal depression history.

• Etiology

  • Biopsychosocial: genetics, neural dysregulation + environmental stress, trauma, socioeconomic deprivation (Thompson et al., 2020).

  • Often preceded by anxiety or behaviour disorders (Monroe et al., 2013).

• Interventions

  • CBT-based Prevention: Johna et al. (2012) middle-school program teaching CBT triad (thoughts–feelings–behaviour), coping, decision-making → reduced hopelessness & symptoms.

  • Family-Focused Treatment for Childhood Depression (FFT-CD) (Thompson et al., 2007; 2017; 2020)

  • Psychoeducation, positive parent–child interactions, behavioural activation, communication/problem-solving skills.

  • Demonstrated superiority over individual supportive therapy.

Cross-Cutting Contributing Factors

• Biological: genetic heritability, prenatal substance exposure, frontal-lobe deficits, temperament (hyperactivity, low effortful control).

• Family environment

  • Inconsistent or coercive discipline, parental aggression, low warmth, poor monitoring.

  • Parental mental health (anxiety, depression) magnifies child risk.

• Peer context: victimisation, status competition, moral disengagement via group norms.

• School context: academic failures, punitive climates, lack of mental-health programming.

Evidence-Based Intervention Themes

• Parent-centred: PMT, positive parenting, supervision, non-violent discipline.

• Child-centred CBT: emotion recognition, cognitive restructuring, problem solving, exposure, social skills training.

• Family systems: FFT-CD, family-based anxiety CBT; focus on communication & shared coping.

• School-wide: anti-bullying curricula, teacher training, bystander mobilisation, positive climate.

Ethical, Philosophical, & Practical Implications

• Early identification essential; externalisers draw attention, internalisers may be missed → universal screening recommended.

• Clinicians must manage counter-transference when faced with hostile or remorseless behaviours (Exercise 14.1 scenarios illustrate need for self-reflection & supervision).

• Interventions should be developmentally tailored (e.g., adjust CBT for younger cognition, emphasise caregiver involvement).

• Equity considerations: socioeconomic deprivation and systemic