Hilangnya daya untuk mengenali arti stimuli sensoris; macamnya sesuai dengan ideranya dan dibedakan auditory (acoustic), visual, olfactory, gustatory dan tactile.

Merriam-Webster Online Dictionary
agnosia (noun)
loss or diminution of the ability to recognize familiar objects or stimuli usually as a result of brain damage
Agnosia (Wikipedia)
For the Spanish film, see Agnosía.
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Agnosia causes the victims to lose the ability to recognize or comprehend the meaning of objects even with intact senses.
Classification and external resources
Specialty Neurology, Psychiatry
ICD-10 F80.2, F88.0 and R48.1
ICD-9-CM 784.69
eMedicine agnosia/
MeSH D000377
Picture of the ventral and dorsal streams. The ventral stream is depicted in purple and the dorsal stream is depicted in green.

Agnosia is the inability to process sensory information. Often there 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 occipitotemporal border, which is part of the ventral stream. Agnosia only affects a single modality, such as vision or hearing. More recently, a top-down interruption is considered to cause the disturbance of handling perceptual information.