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Pupil size reveals the perceptual quality and effortless nature of #synesthesia https://elifesciences.org/articles/110390 Physiologically measurable phenomenology: "responses emerged too rapidly …

Pupil size reveals the perceptual quality and effortless nature of synesthesia
Synesthetes' pupils reflect the brightness of colors that they only see internally, making their hidden perceptual experience objectively measurable.

Ear plugs don't stop the lights from screaming
Why are the lights so bright in the quiet room?
#synesthesia