Falling and nystagmus may accompany spontaneous or induced past pointing. Past pointing frequently occurs unilaterally and may be present in one place and not in another. The reason why a person fast points on turning that he still has the subjective sensation of rotation in the direction in which he was turned after he stopped. And over correct the objectively false sensation by pointing away from (opposite to) the direction of rotation.

A number of skilled acts have already been tested for incidentally in the course of the coordination tests. Touching alternately the fingers with the thumb, picking up a pin, playing instrument, writing and speaking are skilled acts, the last being the most complex of all. Skilled acts may be interfered with by actual impairment of the musculature and its peripheral innervations (sensory or motor), by involvement of the upper motor neurons, by cerebellar in coordination and finally by impairment of the higher cortical associative or cognitive functions. And movement then may be badly performed or not at all because the peripheral apparatus, the tool so speak is affected because the motion concept or formula is impaired. By common consent apraxia is used to designate that loss or impairment of skilled movement in which only the conceptual motion formula is lost, while the motor apparatus for performing the act is intact. We speak of apraxia (total loss) and dyspraxia (partial impairment). Similarly with speech disturbances the difficulty may be in articulation. That is the speech musculature or its innervations is impaired, or in the formulation of speech concept. Complete lost of articulatory speech is known as anarthria, while partial impairment is spoken of as dysarthria. In aphasia there are disturbances of language (hearing, reading, writing, speaking, gestures,etc) in the presence of an intact peripheral speech apparatus both on the perceptive and expressive side.