If you’re not wired up for that, then you could do it magnetically. And to do that, you’ll need a Transcranial Magnetic Stimulation wand, which creates a strong magnetic field at its tip. Rest it on your head and turn it on, and a magnetic field momentarily passes across the brain tissue directly beneath it, inducing a current that activates that brain tissue. Unfortunately, this has even less control than the electrodes — but if you place it over the visual cortex, it can be reliably used to trigger little flashes of light called phosphenes.
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