Briefly, this task is based on the conditioning of an innate response to fear consisting in a complete lack of movements, i.e. the freezing behavior. During a training phase, the animal is exposed to a conditioned stimulus (tone or light), paired with a mild footshock (unconditioned stimulus). After a delay, the context-dependent fear is evaluated by measuring freezing behavior in subjects replaced in the same apparatus without tone/light presentation, whereas cued-dependent fear is reflected by measuring freezing in response to tone/light presentation in a distinct chamber. These tasks require different brain areas.