If you are in a completely dark room and accidentally hit your head, you might see "stars." Even though there was only mechanical stimulation to your eyes and no light, you still had an experience of light. This fact is predicted by

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Quizplus · Accepted Answer

The doctrine of specific nerve energies, proposed by Johannes Müller, states that the nature of a sensation depends on which sensory fibers are stimulated, not on how the fibers are stimulated. Thus, mechanical stimulation (like hitting your head) can lead to the experience of seeing "stars" because it activates the visual pathways in the absence of light.

If You Are in a Completely Dark Room and Accidentally