- 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 hyperschématie was introduced in or shortly before 1905 by the French neurologist Pierre Bonnier (1861-1918) to denote a variant of " aschematia characterized by an exaggeration of the space occupied by some part of the body. Today the term is used to denote a left (i.e. con-tralesional) expansion of object representations due to a lesion to the right parietal lobe. Because of its subjective nature, hyperschematia cannot be observed directly in affected individuals. However, the condition can be inferred from drawings made by these individuals. In these drawings, the left side of a clock is characteristically enlarged and the petals on the left side of a daisy tend to be both larger and more numerous than those on the right. Hyperschematia is considered a productive, subconscious manifestation of neglect. It is usually classified as a "body schema illusion. Although phenomenologically there is some overlap between hyperschematia and " hemimicropsia, the two conditions differ in several respects: hemimicropsia may affect either of the spatial hemifields, individuals with hemimi-cropsia tend to be aware of their condition, and they perceive objects within the contralesional hemifield as being smaller and/or distorted in size. The term hyperschematia was used by Bonnier in opposition to the terms "hyposchematia and " paraschematia.ReferencesBonnier, P. (1905). L'aschématie. Revue Neurologique, 13, 605-609.Rode, 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:
aschematia — The term aschematia comes from the Greek words an (not) and schèma (form, scheme, or topographic map). It translates roughly as an inadequate mapping of space . The term asché matie was introduced in or shortly before 1905 by the French… … Dictionary of Hallucinations
hemimicropsia — 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… … Dictionary of Hallucinations
Alice in Wonderland syndrome — Also known as Alice in Wonderland effect, Wonderland syndrome, and syndrome of Alice in Wonderland. The term syndrome of Alice in Wonderland was introduced in or shortly before 1955 by the British psychiatrist John Todd (1914 1987) to denote a … Dictionary of Hallucinations
Dodgson, Charles Lutwidge — (1832 1898) Better known as Lewis Carroll. A British mathematician, and member of the Society for Psychical Research (SPR), as well as an author of children s books, who is probably best known for his Alice s Adventures in Wonderland.As… … Dictionary of Hallucinations
hyposchematia — The term hyposchematia comes from the Greek words hupo (below, beneath) and schema (form, scheme, topographic map). It translates roughly as insufficiently detailed mapping of space . The term hyposchématie was introduced in or shortly before… … Dictionary of Hallucinations
left size distortion — see hyperschematia … Dictionary of Hallucinations
paraschematia — The term paraschematia comes from the Greek words para (beside, near, resembling, accessory to, beyond, apart from, abnormal) and schema (form, scheme, topographic map). It translates roughly as inadequate mapping of space . The term… … Dictionary of Hallucinations