The invention relates to an assistance device intended for a person (1) suffering from motor disorders of neurological origin, comprising: an accelerometer suitable for being worn by the person to measure accelerations; and storage means storing a plurality of previously defined alert acceleration threshold values; and means (5) for emitting an auditory stimulation perceptible to the person wearing the accelerometer; and calculation means configured to perform the following steps: a) determine a posture of the person from the measured accelerations; b) compare the accelerations measured by said accelerometer in the first direction in relation to at least one anticipatory acceleration threshold value associated with said posture; c) command the emission of an auditory stimulation as a function of the crossing of said anticipatory acceleration threshold value associated with said posture for a determined time associated with said anticipatory acceleration threshold value.