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| − | '''Apperceptive Agnosia''' is the visual disorder that renders a person unable to recognize objects. It is also known as ''visual space [[agnosia]]''. Distinction between shapes is difficult, although other aspects of [[Visual perception|vision]], such as ability to see detail and colour, remain intact. Recognition of, copying and discriminating between visual stimuli, even of different shapes, is problematic. Apperceptive agnosics cannot complete an object matching task. |
+ | '''Apperceptive Agnosia''' is the [[visual disorder]] that renders a person unable to recognize objects. It is also known as ''visual space [[agnosia]]''. Distinction between shapes is difficult, although other aspects of [[Visual perception|vision]], such as ability to see detail and colour, remain intact. Recognition of, copying and discriminating between visual stimuli, even of different shapes, is problematic. Apperceptive agnosics cannot complete an object matching task. |
Because they are unable to recognize even simple shapes, Apperceptive agnosia is considered a problem in the early part of the visual processing system. As contrasted with patients diagnosed [[Associative agnosia]], whom are able to recognize simple shapes and even copy complex shapes (drawing of an anchor, for example) but are unable to recognize what an object is. |
Because they are unable to recognize even simple shapes, Apperceptive agnosia is considered a problem in the early part of the visual processing system. As contrasted with patients diagnosed [[Associative agnosia]], whom are able to recognize simple shapes and even copy complex shapes (drawing of an anchor, for example) but are unable to recognize what an object is. |
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Revision as of 08:59, 22 March 2010
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Apperceptive Agnosia is the visual disorder that renders a person unable to recognize objects. It is also known as visual space agnosia. Distinction between shapes is difficult, although other aspects of vision, such as ability to see detail and colour, remain intact. Recognition of, copying and discriminating between visual stimuli, even of different shapes, is problematic. Apperceptive agnosics cannot complete an object matching task. Because they are unable to recognize even simple shapes, Apperceptive agnosia is considered a problem in the early part of the visual processing system. As contrasted with patients diagnosed Associative agnosia, whom are able to recognize simple shapes and even copy complex shapes (drawing of an anchor, for example) but are unable to recognize what an object is.
In both cases, identification of objects is entirely based on inferences made by the person based on the colour, size, social, or contextual cues.
A variant of apperceptive agnosia is the inability to recognize objects outside of their normal rotation or orientation.
See also
References
Further reading
- Fundamentals of Sensation and Perception, Michael Levine. Oxford University Press (3rd Edition). London, 2000.
- Visual Perception, Tom Cornsweet. Harcourt Publishing, London, 1970.
Eye disease - pathology of the eye (H00-H59, 360-379) | |||||||||||||||
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| Adnexa |
eyelid: inflammation (Stye, Chalazion, Blepharitis) - Entropion - Ectropion - Lagophthalmos - Blepharochalasis - Ptosis - Blepharophimosis - Xanthelasma - Trichiasis - Madarosis lacrimal system: Dacryoadenitis - Epiphora - Dacryocystitis orbit: Exophthalmos - Enophthalmos | ||||||||||||||
| Eyeball |
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| Optic nerve and visual pathways |
Optic neuritis - Papilledema - Optic atrophy - Leber's hereditary optic neuropathy - Dominant optic atrophy - Optic disc drusen - Glaucoma - Toxic and nutritional optic neuropathy - Anterior ischemic optic neuropathy | ||||||||||||||
| Ocular muscles, binocular movement, accommodation and refraction |
Paralytic strabismus: Ophthalmoparesis - Progressive external ophthalmoplegia - Palsy (III, IV, VI) - Kearns-Sayre syndrome
Other strabismus: Esotropia/Exotropia - Hypertropia - Heterophoria (Esophoria, Exophoria) - Brown's syndrome - Duane syndrome | ||||||||||||||
| Visual disturbances and blindness |
Amblyopia - Leber's congenital amaurosis - Subjective (Asthenopia, Hemeralopia, Photophobia, Scintillating scotoma) - Diplopia - Scotoma - Anopsia (Binasal hemianopsia, Bitemporal hemianopsia, Homonymous hemianopsia, Quadrantanopia) - Color blindness (Achromatopsia, Dichromacy, Monochromacy) - Nyctalopia (Oguchi disease) - Blindness/Low vision | ||||||||||||||
| Pupil |
Anisocoria - Argyll Robertson pupil - Marcus Gunn pupil/Marcus Gunn phenomenon - Adie syndrome - Miosis - Mydriasis - Cycloplegia | ||||||||||||||
| Infectious diseases |
Trachoma - Onchocerciasis | ||||||||||||||
| Other |
Nystagmus - Glaucoma/Ocular hypertension - Floater - Leber's hereditary optic neuropathy - Red eye - Keratomycosis - Xerophthalmia - Phthisis bulbi | ||||||||||||||
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See also congenital | |||||||||||||||
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