So basically, the sensitivity curves of the receptors in the eye overlap ( https://commons.m.wikimedia.org/wiki/File:Cone-fundamentals-with-srgb-spectrum.svg#mw

So basically, the sensitivity curves of the receptors in the eye overlap ( https://commons.m.wikimedia.org/wiki/File:Cone-fundamentals-with-srgb-spectrum.svg#mw-jump-to-license https://commons.m.wikimedia.org/wiki/File:Cone-fundamentals-... ) so a signal can’t excite a single type of receptor, but they did it by using a focused laser to exclusively target the one type of receptor?