- The term hemimicropsia comes from the Greek words hèmi (half), mikros (small), and opsis (seeing). It translates roughly as 'seeing objects in one half of the visual field as smaller'. The term is used to denote a rare disorder of visual perception in which the perceived size of objects within the contralesional hemifield is reduced. Individuals who suffer from hemimicropsia tend to be fully aware of their condition. They usually report a perceived smallness and/or distortion of objects on one side, and during drawing tasks they compensate for this perceived smallness by portraying objects on that side as larger than their contralateral counterparts. Hemimicropsia tends to be attributed to lesions and/or a malfunction in specific areas within the visual association cortex. Although phenomenologically there is a certain overlap with " hyperschematia, the two conditions differ in that hyperschematia tends to affect the left hemifield, individuals with hyperschema-tia are generally unaware of their condition, and the left-sided expansion in their drawings is seen as a result of neglect rather than perceptual distortion. Hemimicropsia is classified as a type of "metamorphopsia, more specifically as a variant of " micropsia. The term is used in opposition to " hemimacropsia.ReferencesRode, G., Michel, C., Rossetti, Y., Boisson, D., Vallar, G. (2006). Left size distortion (hyper-schematia) after right brain damage. Neurology, 67, 1801-1808.
Dictionary of Hallucinations. J.D. Blom. 2010.
Look at other dictionaries:
Micropsia — An illustration depicting the symptoms of micropsia from Lewis Carroll s 1865 novel Alice s Adventures in Wonderland. ICD 10 H … Wikipedia
hyperschematia — Also known as left size distortion. The term hyperschematia comes from the Greek words huper (to exceed a certain boundary) and schèma (form, scheme, topographic map). It translates roughly as overly detailed mapping of space . The term… … Dictionary of Hallucinations
hemimacropsia — The term hemimacropsia comes from the Greek words hèmi (half), makros (large), and opsis (seeing). It translates roughly as seeing objects in half of the visual field as larger . The term is used to denote a rare disorder of visual perception… … Dictionary of Hallucinations
micropsia — Also known as micropsy, microptic vision, Lilliput sight, Lilliput vision, and lilliputianism, after the fictitious country featuring in the novel Gulliver s Travels by the Irish poet and author Jonathan Swift (1667 1745). The term micropsia… … Dictionary of Hallucinations