Aphantasia — absence of the mind's eye
You've probably heard sentences like this a thousand times: "Picture it in your mind's eye". How literally can we take that?
"What Does it Mean to 'See With the Mind's Eye?'" (Conor Friedersdorf, The Atlantic [12/4/14]):
Imagine the table where you've eaten the most meals. Form a mental picture of its size, texture, and color. Easy, right? But when you summoned the table in your mind's eye, did you really see it? Or did you assume we've been speaking metaphorically?
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