Canadian Medical Guide > Diseases > Nervous System Diseases > Neurologic Manifestations > Neurobehavioral Manifestations > Perceptual Disorders Terms and Definitions

Perceptual Disorders

Medical Definition:	Cognitive disorders characterized by an impaired ability to perceive the nature of objects or concepts through use of the sense organs. These include spatial neglect syndromes, where an individual does not attend to visual, auditory, or sensory stimuli presented from one side of the body.
Also Called:	Hemisensory Neglect,Hemispatial Neglect,Sensory Neglect,Somatosensory Discrimination Disorder
Previously Indexed:	Agnosia (1966-1968),Hallucinations (1966-1968),Illusions (1966-1968),Perception (1966-1968),Phantom Limb (1966-1968)

Perceptual Disorders Categories.

	Agnosia - Loss of the ability to comprehend the meaning or recognize the importance of various forms of stimulation that cannot be attributed to impairment of a primary sensory modality. Tactile agnosia is characterized by an inability to perceive the shape and nature of an object by touch alone, despite unimpaired sensation to light touch, position, and other primary sensory modalities.
	Hallucinations - Subjectively experienced sensations in the absence of an appropriate stimulus, but which are regarded by the individual as real. They may be of organic origin or associated with MENTAL DISORDERS.
	Illusions - The misinterpretation of a real external, sensory experience.
	Phantom Limb - Perception of painful and nonpainful phantom sensations that occur following the complete or partial loss of a limb. The majority of individuals with an amputated extremity will experience the impression that the limb is still present, and in many cases, painful. (From Neurol Clin 1998 Nov;16(4):919-36; Brain 1998 Sep;121(Pt 9):1603-30)

Perceptual Disorders Medical Definitions and Terms

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