Agnosia

Definition

Agnosia is a neurologic deficit in which a person cannot recognize objects, faces, sounds, shapes, or smells despite having intact sensory organs, attention, and language. It results from damage to association areas of the brain that integrate sensory input with memory.

Common Types

• Visual agnosia: Cannot identify seen objects (often occipital lobe lesions).
• Prosopagnosia: Cannot recognize faces, even familiar loved ones.
• Auditory agnosia: Cannot recognize sounds or spoken words.
• Tactile agnosia (astereognosis): Cannot identify objects by touch.

Associated Conditions

Stroke (CVA), Alzheimer's disease, dementia, brain tumors, and traumatic brain injury.

Nursing Considerations

Provide a safe, familiar environment with clear labels on commonly used items. Use multiple sensory cues when communicating. Assist with feeding and activities of daily living as needed, and support family coping. Recognition loss is emotionally devastating.

NCLEX Relevance

Differentiate agnosia from aphasia (language) and apraxia (motor planning). Commonly tested in dementia and stroke case studies.