Agnosia

Agnosia is a neurological condition in which a person loses the ability to recognise and interpret sensory information, despite their senses functioning normally. In the context of dementia, this means a person may not recognise familiar faces, objects, or surroundings — not because they cannot see or hear, but because the brain cannot process what it is perceiving.

There are several types of agnosia. Visual agnosia means a person may look directly at a common object like a cup or a comb and not recognise what it is or how to use it. Prosopagnosia (face blindness) means they may not recognise family members or their own reflection. Auditory agnosia affects the ability to identify sounds, and tactile agnosia affects recognition through touch.

For families, agnosia can be one of the most emotionally challenging aspects of dementia. When a loved one does not recognise your face, it can feel deeply personal — but it is important to remember that this is a symptom of the condition, not a reflection of your relationship or their feelings for you. The emotional bond often remains even when recognition fades.

There are practical ways to help. Introducing yourself gently when you visit ("Hi Mum, it's Sarah, your daughter") can reduce confusion without putting pressure on your loved one to remember. Labelling cupboards and drawers with pictures, keeping the environment consistent, and using verbal cues alongside visual ones can all help compensate for recognition difficulties.

If you notice your loved one struggling to recognise familiar things or people, mention it to their healthcare team. Understanding which type of agnosia is present can help you adapt your approach and environment more effectively.