- Also known as Oppel illusion, filled-space illusion, and filled/unfilled space illusion. The eponym Oppel-Kundt illusion refers to the German physicists Johann Joseph Oppel (1815-1894) and August Adolph Eduard Eberhard Kundt (1839-1894), who have both been credited with describing specific aspects of the concomitant " geometric-optical illusion described by Oppel in 1854. The Oppel-Kundt illusion involves the subjective impression that a distance divided by graduated lines is longer than a similar, yet undivided distance. This principle is also referred to as Kundt's rule. As early as the fourth century BC, this illusion was described by the Greek philosopher Aristotle (384-322 BC) in his book Problems. As Aristotle's text describes the divided line as appearing shorter, while it is known to appear longer, it has been suggested that it may not have been written by Aristotle but by one of his pupils. As is the case with other geometric-optical illusions, the Oppel-Kundt illusion is considered a physiological phenomenon that arises as a consequence of the inherent properties of the visual system - which prompts the brain to calculate a 'weighted mean value' that is spread out over a population of neurons, and leads the observer to overestimate the divided distance in comparison to the undivided one. The Oppel-Kundt illusion is generally classified as a geometric-optical illusion, which itself tends to be classified as a subtype of the "optical illusions.ReferencesKundt, A. (1863). Untersuchungen über Augenmaß und optische Täuschungen. Poggen-dorffs Annalen der Physik und Chemie, 120, 118-158.Oppel, J.J. (1854/1855). Ueber geometrischoptische Täuschungen. (Zweite Nachlese.) In: Jahres-Bericht des physikalischen Vereins zu Frankfurt am Main, 37-47.
Dictionary of Hallucinations. J.D. Blom. 2010.
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Oppel illusion — see Oppel Kundt illusion … Dictionary of Hallucinations
Kundt's rule — see Oppel Kundt illusion … Dictionary of Hallucinations
ILLUSION — ILLUSI Métaphoriquement dérivé de la réduction psychologique des enchantements magiques et des découvertes de l’optique géométrique, couronnant, avec Kant, la critique relativiste de l’optimisme leibnizien, le concept moderne d’illusion a conquis … Encyclopédie Universelle
Illusion optico-géométrique — ● Illusion optico géométrique erreur de la perception visuelle de figures géométriques, se manifestant chez les individus par une surestimation ou une sous estimation systématiques de longueur, de surface, de direction ou d incurvation des angles … Encyclopédie Universelle
geometric-optical illusion — The term geometric optical illusion is indebted to the Greek words geometria (land surveying) and opsis (seeing). It was introduced in or shortly before 1854 by the German physicist Johann Joseph Oppel (1815 1894) to denote a *visual… … Dictionary of Hallucinations
optical illusion — The term optical illusion is used in a narrow and a broad sense. In the narrow sense, it denotes an illusion attributable to the optics of the eye. In the broad sense, it is used as an equivalent of the term visual illusion, denoting any… … Dictionary of Hallucinations
Aristotle's illusion — The eponym Aristotle s illusion refers to the Greek philosopher Aristotle (384 322 BC), who appears to have been the first to describe the concomitant phenomenon in his books On dreams, Metaphysics,andProblems. The expression Aristotle s… … Dictionary of Hallucinations
filled-space illusion — see Oppel Kundt illusion … Dictionary of Hallucinations
filled/unfilled space illusion — see Oppel Kundt illusion … Dictionary of Hallucinations