Language skills and interpersonal trust in adolescents with and without mental illness.

Purpose : The primary aim was to compare adolescents with mental illness and non-clinical adolescents on vocabulary, social problem-solving, trust in parents, attachment and mentalisation. A secondary aim was to investigate whether adolescents' language skills were associated with trust in parents. Method : Seventy-eight adolescents (16-18 years) participated in this cross-sectional quantitative study: a clinical sample ( n  = 28, M  = 16.7 years, 19F) recruited from a mental health service and a non-clinical sample ( n  = 50, M  = 17.0 years, 28F). Standardised language measures and self-report measures of trust in parents; communication quality; attachment; and mentalisation were used. Primary and secondary aims were addressed through independent samples t-tests and Pearson's correlation analyses, respectively. Result : Adolescents experiencing mental illness reported significantly poorer vocabulary, less trust in mother/father, greater attachment anxiety/avoidance, and poorer reflective functioning, than non-clinical adolescents. Expressive vocabulary of clinical (but not non-clinical) adolescents significantly negatively correlated with trust in mother (but not father). Conclusion : Results highlight a role for speech-language pathologists (SLPs) in supporting communication needs of adolescents with mental illness. SLPs should consider trust by: i) understanding adolescents with mental illness may have difficulty trusting them potentially impacting therapeutic engagement; and ii) delivering services in ways that might build trust, such as involving adolescents in treatment planning.