Out of this chaos of symptoms the “trembling” neurosis stands out through its frequency and conspicuousness. You all know those pathetic creatures who hobble along through the streets with shaking knees, uncertain gait and peculiar motor disturbances. They give the impression of being helpless and incurable invalids; and yet experience shows that also this traumatic form of illness is purely psychogenic. A single treatment with electricity and suggestion, a few hypnotic sittings are often sufficient in rendering these men capable of doing some work, if only temporarily and under certain conditions. Erben has made the most careful investigation into these disturbances of innervation; he found that these disturbances are only suspended or increased when the respective group of muscles carry out an action or intend to do so. His explanation for this is, that here the “volitional impulse makes a path for the spasm”, which, however, is only the physiological paraphrase of the facts of the case. Psycho-analysis suspects here a psychical motivation: the activity of an unconscious contrary wish which puts itself in the way of the consciously wished act. This is indeed most striking in those patients of Erben who are prevented from going forward through the most violent attacks of shaking, but can carry out the much more difficult task of going backwards without trembling. Erben also here has a complicated physiological explanation ready, but forgets that the movement backwards, which removes the patient from the dangerous goal of the forward movement—and finally from the front line—does not need to be disturbed by any contrary wish. The remaining kinds of motor disturbances demand a similar interpretation, in particular the striking, uncontrollable running of many neurotics, so like the propulsion in paralysis agitans. These are the men who do not recover from the effect of the terror and are still always flying from dangers to which they were once exposed.