Explain how the two-point discrimination test illustrates how the density of touch receptors in a receptive field varies in different areas of the body?

By experimenting and comparing the results on different body parts.

Explanation:

The "Two Point Discrimination Test" is designed to illustrate the density of touch sensitive receptors for different parts on our body and our ability to tell if there are two distinct objects that we are touching or not.

The density of touch receptors in different receptive fields on our body can be our hands and our back for example, the receptive field density is much more higher in our hands for evolutionary reasons so we are able to more easily tell two distinct objects apart that we are touching with our hands.

I hope this answer helps.