Device and method of detecting a state of cognitive distraction of a driver

The invention relates to a detection device of a cognitive state of distraction of the driver of a vehicle (1), said device comprising: - at least one camera adapted to capture images of the face of said conductor, - a detection module unit facial movements of a succession of views of the face of the driver, - a module for determining a cognitive state of distraction of the driver from the detection unit movements and / or representative unitary movement from correlations of a state cognitive distraction.