- Also known as motor sensation and illusory movement. The term motor illusion is indebted to the Latin noun motio, which means movement. It is used to denote a * kinaesthetic hallucination characterized by the illusory sensation of movement of one or more body parts. Pathophysio-logically, motor illusions are associated primarily with lesions of parts of the parietal lobe involved with bodily representation and/or the representation of movement. Etiologically, they are associated primarily with * aurae occurring in the context of paroxysmal neurological disorders such as migraine and epilepsy. Motor illusions may also occur in individuals with a clinical diagnosis of * schizophrenia or in the context of hemiplegia due to parietal lobe lesions. As the British neurologist Macdonald Critchley (1900-1997) maintains, "The patient may entertain that one of his limbs is completely detached from his own body and occupies some position nearby or afar. Or the patient may imagine his affected limb to be moving when it is actually immobile. Such an idea may be illusory or delusional; it can occur in episodic fashion, or it can be continual." As demonstrated in myriad experimental configurations, motor illusions can be evoked within seconds when muscle vibration is used to generate proprioceptive misinformation about limb position. Some examples of the resulting motor illusions are the * illusory arm extension and the *Pinocchio illusion. Vibration-induced illusory movement experiences were first described in 1972 in two separate and independent publications.ReferencesCritchley, M. (1965). Disorders of corporeal awareness in parietal disease.In: The body percept. Edited by Wapner, S., Werner, H. New York, NY: Random House.Eklund, G. (1972). Position sense and state of contraction: The effects of vibration. Journal ofNeurology, Neurosurgery and Psychiatry, 35, 606-611.Goodwin, G.M., McCloskey, D.I., Matthews, P.B.C. (1972). The contribution of muscle afferents to kinaesthesia shown by vibration induced illusions of movement and by the effects of paralysing joint afferents. Brain, 95, 705-748.Jones, L.A. (1988). Motor illusions: What do they reveal about proprioception? Psychological Bulletin, 103, 72-86.
Dictionary of Hallucinations. J.D. Blom. 2010.
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motor sensation — see motor illusion … Dictionary of Hallucinations
Pinocchio illusion — Also referred to as phantom nose illusion. The eponym Pinocchio illusion refers to Pinocchio, the protagonist of the childrens book The Adventures of Pinocchio by the Italian author Carlo Lorenzini, better known as Carlo Collodi (18261890). It … Dictionary of Hallucinations
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phantom limb illusion — Also referred to as phantom or phantom limb. The term phantom comes from the Greek noun phantasma, which means ghost or spectre. The terms phantom and phantom limb refer to an arm or a leg, the presence of which is perceived although the limb… … Dictionary of Hallucinations
force-movement illusion — A term used to denote a variant of the group of * motor illusions characterized by a mispercep tion of limb position due to the forces generated by that limb against a force that moves it in the opposite direction. For example, if a subject is … Dictionary of Hallucinations
illusory arm extension — The term illusory arm extension refers to a subclass of the motor illusions, which is itself a subclass of the group of illusory movement experiences. The phenomenon of illusory arm extension can be induced by means of vibratory stimulation of … Dictionary of Hallucinations