Aphantasia is a condition where a person is unable to visualize images in their minds eye. If I tell you to think of a red apple, several people will visualize this apple and 'see' it. But those (like me) with aphantasia simply can't. Some of us have access to other senses within our mind (hearing, touch, smell, etc), some don't.

Do you have aphantasia? There's a simple test here.

In a similar vein, is anybody able to explain what visualizing looks like? Is it just like the sight I get from my eyes? Different?