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I can also do this, I discovered it one day when I noticed that I could change the brightness of what I saw, and I wondered if that was purely in my head or if

by dusted 5y ago

I can also do this, I discovered it one day when I noticed that I could change the brightness of what I saw, and I wondered if that was purely in my head or if it actually changed my pupil, so I repeated the experiment with my wife observing it, I think we even filmed it and sent it to one of her professors who'd like to see it. But as the twitter thread shows, lots of people can do that.

doener 5y ago
You can write Christoph Strauch: https://twitter.com/c_strauch/status/1428290953035538436 https://twitter.com/c_strauch/status/1428290953035538436
zimpenfish 5y ago
> But as the twitter thread shows, lots of people can do that. Only seen a few videos there but they all seem to have a distinct-but-not-fully opening and closing of the eyelids happening at the same time - when the eyelids close, the pupil grows; when they open, it shrinks. Which suggests a certain amount of autonomic reaction to changing light conditions rather than controlling the pupil itself? I guess you'd have to demonstrate it without any eyelid movement to control for that.