Sure it does, the signal is the feeling. You are your body, so when your body sends a signal that is you feeling something.

But how come people have different pain thresholds then?

I did a bunch of research on pain some years ago, and in order to "standardize" it, one would apply a treatment when the person said pain was greater than 7 out of 10 on a scale.

If pain were measurable "objectively", this wouldn't be necessary.

People are not uniform templates using identical DNA and histories. Our bodies are different which means our subjective experiences are different. That’s both consistent and expected.

As to measurement, we can design and build modern CPU’s but can’t inspect them in full speed operation. Similarly, mechanics often need to take something apart to test it. Living organisms present a more complex challenge, but the similarities are obvious.

Yes, but we cannot measure pain "objectively" at all. The equivalent would be if we could build a CPU, but could only determine how fast it could process by asking it to rate its processing power on a scale of 0 to 10.

Nothing is stopping a more technologically capable civilization from directly measuring our pain. You’re describing a purely technical limitation.

We have plenty of ways of directly measuring people‘s brains and CPU’s energy use etc. The issue is speed and resolution which is hardly a philosophical limitation.

> But how come people have different pain thresholds then?

Different signal sources and also differently configured/trained systems receiving and interpreting those signals.

But practically, it makes more sense to use the instrument already evolved and trained by their own experience to measure their pain: the person themselves.

> Different signal sources and also differently configured/trained systems receiving and interpreting those signals.

I think that this is a little too general a statement, given that it could be used to describe almost any human variability.