Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
The onset refers to the beginning or start of a particular condition, such as a neurodevelopmental disorder. It indicates when the symptoms or signs of the disorder first become noticeable.
Related terms
Developmental trajectory: Refers to the pattern and course of development over time in individuals with neurodevelopmental disorders.
Early intervention: Involves providing support and treatment as soon as possible after recognizing early signs of a neurodevelopmental disorder.
Genetic predisposition: Indicates an increased likelihood for developing a certain condition due to genetic factors.