Prof. Henri Laborit uses the stories of the lives of three people to discuss behaviorist theories of survival, combat, rewards and punishment, and anxiety. René is a technical manager at a textile factory and must face the anxiety caused by corporate downsizing. Janine is a self-educated actress/stylist who learns that the wife of her lover is dying and must decide to let them reunite. Jean is a controversial career-climbing writer/politician at a crossroads in life.

Émile Durand, an insecticide manufacturer, is appalled to learn that his son Gérard has fallen in love with Suzy, the daughter of a travelling theatre company. Realising his father will never favour the union, Gérard joins the company on their next tour. In an attempt to heal the rift, Durand’s wife goes after Gérard and ends up performing in their next play…