# Behavioral State Change Behavioral state change is a meaningful shift in readiness, participation, avoidance, trust, hostility, affiliation, or action after exposure to an intervention or environment. It differs from reach: encountering a message does not establish that anything changed. Measurement may combine repeated observations, comparison groups, longitudinal patterns, qualitative evidence, and downstream behavior. Claims should distinguish correlation from causation and avoid inferring private mental states from a single platform signal. Related: [[wiki/Behavioral Signal|Behavioral Signal]], [[wiki/Human Response Structure|Human Response Structure]], [[wiki/Audience Analytics|Audience Analytics]], [[wiki/Feedback Loops|Feedback Loops]].