( a = not, gno = know) - inability recognising familiar objects or symbols by the senses : sight (visual agnosia, may fail to recognise colour, faces, may put inappropriate objects in mouth) or touch (tactile agnosia) or sound (auditory agnosia - e.g., can't recognise a sound such as doorbell). For tactile agnosia, the problem is present in both hands. Agnosias are due to disturbance of function in the cerebral cortex. Visual agnosia can occur with and without an hemianopia. In visuospatial agnosia the person has difficulty putting two objects together e.g., cup on saucer.

Child's inability to recognize objects and their meaning, usually resulting from damage to the brain.

failure to recognize familiar objects even though the sensory mechanism is intact.

Failure to recognize or identify objects despite intact sensory function; This may be seen in dementia of various types. An example would be the failure of someone to recognize a paper clip placed in their hand while keeping their eyes closed.

A collective term for the inability to identify objects based on sensory information, even though the primary sensory cortex is intact.

Failure to recognise or identify objects despite intact sensory function.

An inability (or impaired ability) to recognise objects or other events via the senses when that sense is unimpaired. Visual agnosia means an inability to recognise objects by sight, despite preserved vision. Similarly, auditory agnosia is an inability to recognise sounds, and tactile agnosia is an inability to recognise objects by touch.

Generally, an agnosic can sense objects and forms but is unable to consciously recognise and interpret their meaning. Agnosia is a result of neurological pathology and can be manifested in almost any perceptual/cognitive system. There are many forms, these include : "apperceptive agnosia" (visual perception), auditory agnosia (hearing perception), tactile agnosia (tactile perception).

loss of ability to recognize objects, people, sounds, shapes, or smells. Common to tumors of the parietal lobe of the cerebral hemispheres.

inability to recognize objects by use of the senses

Loss of the ability to recognize the meaning of a sensory stimulus. For example, visual agnosia is the inability to recognize familiar objects by sight.

Total or partial loss of the ability to recognize familiar persons or objects. [ Quick find

A general term for a loss of ability to recognize objects, people, sounds, shapes, or smells; that is, the inability to attach appropriate meaning to objective sense-data. It usually is used when the primary sense organ involved is not impaired.

Inability to recognize the meaning of sensory stimuli.

Failure to recognize familiar objects although the sensory mechanism is intact. May occur for any sensory modality.

Loss of the ability to interpret events through a sense or senses.

the inability to recognize objects and/or events through the senses. With auditory agnosia, one does not recognize nonverbal sounds such as the bark of a dog or the ring of the telephone. With auditory verbal agnosia, one is unable to understand spoken words. With tactile agnosia, one cannot recognize objects by feeling them. Someone with visual or optic agnosia cannot recognize people, places, or objects by sight. There are some very specific kinds of visual agnosia. When one is unable to recognize familiar faces, one is suffering from prosopagnosia.

Absence of the ability to recognize the form and nature of persons and things.

an impaired recognition of an object which cannot be accounted for by sensory defecits, impaired consciousness or unfamiliarity with the object. Includes: Anosagnosia - lack of awareness of disease. Most common with left hemiplegic limbs. Autopagnosia - an inability to name or point on command to various parts of the body - right and left.

The inability to recognise an object by touch alone with both hands

A defect in the ability to recognize and intepret compex stimuli caused by lesion in the angular gyrus.

inability to discriminate sensory stimuli

See Sensory Impairment.

literally means, "not to know"; usually preceded by an adjective (e.g., visual agnosia, auditory agnosia, verbal agnosia, etc.) specifying the sensory modality through which the person can not assign meaning to information--example: A person with auditory agnosia has intact hearing but can not assign meaning to the sounds that he/she hears

inability to recognise what is perceived by the senses. The senses themselves, however, are not damaged.

Inability to perceive objects through otherwise normally functioning sensory channels.

A serious disturbance in the organization of sensory information produced by lesions in certain cortical areas. An example is visual agnosia in which the patient can see but often does not recognize what it is that he sees.

Inability to acknowledge one side of the body or one side of the visual field.

loss of comprehension of sensations.

The inability to interpret information

Gr. 'without knowledge'. Inability to interpret sensory information ( Ch. 26).

Agnosia (a-gnosis, "non-knowledge", or loss of knowledge) is a loss of ability to recognize objects, persons, sounds, shapes or smells while the specific sense is not defective nor is there any significant memory loss. It is usually associated with brain injury or neurological illness, particularly after damage to the temporal lobe.