Behave
Behaviour emerges from interacting causes across neural, hormonal, developmental, social, and evolutionary timescales.
Sapolsky begins close to an action, examining neural processes, then moves backward through hormones, preceding experiences, development, genes, culture, and evolutionary history.
An action looks sudden because we see its final moment. Sapolsky asks us to look backward through the conditions that made it possible, from immediate circumstances to development and social history.
No level acts independently. A biological influence depends on context, and social experience changes biological development; one gene or one brain region does not provide a complete behavioural explanation.
The book examines empathy, aggression, group boundaries, hierarchy, cooperation, and judgment. Situations can change which responses become likely, including apparently stable moral behaviour.
The synthesis complicates simple blame and claims about completely autonomous choice. Causal understanding and ethical or legal responsibility remain distinct questions, but more accurate explanations can change prevention, punishment, and the design of social environments.
Immediate explanations often depend on conditions established much earlier.
Adding context need not erase accountability. It can reveal why the same punishment keeps failing, or why changing an environment may prevent harm more effectively than repeating a moral accusation.
Hormonal effects depend on context rather than one guaranteed behaviour.
Group boundaries can alter whose suffering receives attention.
Development and environment shape the operation of inherited capacities.
Multiple causes can interact without contributing equally in every case.
Understanding prevention requires more than deciding whom to blame afterward.