For some people, spirit is detectable by one or more of the five senses. But it's more of an inner manifestation of the five senses in many respects. Except for the sensation like a small (but very annoying) feeling of an electrical charge that I experience in the middle of my back when I get overloaded with spiritual energy. Also the dizziness and nausea I can experience when that happens, and the subsequent vomiting if the source of the energy isn't removed. That is definitely something I detect with one or more of my five physical senses.

BTW, the physical side effects that I experience when I get energy overload is absolutely replicable. However, if someone who doesn't accept the possibility that I can experience spiritual energy as a physical sense would happen to be the one doing the tests on me, there is a good chance that he or she would interpret a psychological cause for my experience.