Method for determining the relative amplitude of eye and head movements of an individual, the method comprising: - a target providing step during which a list of visual targets comprising at least two different visual targets is provided, - a reference positioning step during which the individual is positioned in a reference position, - a reference target providing step during which a reference target is provided, the reference target comprising a reference visual target and a reference auditory target being placed substantially at the same position in space, in front of the individual in the reference position, and so that the virtual line between the individual's head in the reference position and the reference target is substantially perpendicular to the vertical plane defined by the individual's shoulders in the reference position, - a reference target gazing step during which the individual gazes at the reference target, - a peripheral target providing step during which a peripheral target is provided, the peripheral target comprising a peripheral visual target and a peripheral auditory target being placed substantially at the same offset position with respect to the reference target, the visual target being randomly selected from the list of visual targets, - a peripheral target gazing step during which the individual gazes at the peripheral target without moving his shoulders, his head and eyes being oriented towards the peripheral target, - a rotation measurement step during which the angle of rotation (α T) of the individual's head and the angle of rotation (α Y) of the individual's eyes in order to pass from gazing the reference target to gazing the peripheral target are measured, wherein the reference gazing step, a peripheral target providing step, the peripheral target gazing step and the rotation measurement steps are repeated at least twice by randomly placing the peripheral target at different offset positions. - a target providing step during which a list of visual targets comprising at least two different visual targets is provided, - a reference positioning step during which the individual is positioned in a reference position, - a reference target providing step during which a reference target is provided, the reference target comprising a reference visual target and a reference auditory target being placed substantially at the same position in space, in front of the individual in the reference position, and so that the virtual line between the individual's head in the reference position and the reference target is substantially perpendicular to the vertical plane defined by the individual's shoulders in the reference position, - a reference target gazing step during which the individual gazes at the reference target, - a peripheral target providing step during which a peripheral target is provided, the peripheral target comprising a peripheral visual target and a peripheral auditory target being placed substantially at the same offset position with respect to the reference target, the visual target being randomly selected from the list of visual targets, - a peripheral target gazing step during which the individual gazes at the peripheral target without moving his shoulders, his head and eyes being oriented towards the peripheral target, - a rotation measurement step during which the angle of rotation (α T) of the individual's head and the angle of rotation (α Y) of the individual's eyes in order to pass from gazing the reference target to gazing the peripheral target are measured,