The term ‘agnosia’ refers to an inability to recognize and interpret sensory stimuli.

The most common form is visual agnosia (including conditions such as achromatopsia, the loss of colour vision, and prosopagnosia, aka ‘face blindness’), though other forms, such as auditory agnosiatactile agnosia, and even temporal agnosia (the inability to perceive and interpret the succession or duration of events) also exist.

The various forms of agnosia are usually a result of lesions in the brain caused by trauma or stroke, however, they can also be caused by conditions such as dementia and encephalitis, or inherited as a genetic condition.

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