If I remember correctly it is not at all related to fear but a disfunction in the basal ganglia (which performs action selection). Think of it as more like an i

If I remember correctly it is not at all related to fear but a disfunction in the basal ganglia (which performs action selection). Think of it as more like an inability to select an action or to select just one from a range of related movements (not at the conscious level, but between the conscious decision making and the signals being fired down your spine).