Final answer:
The two-point discrimination test is used to measure the receptive field size for touch receptors. It assesses the density of sensory endings and the sensitivity to fine touch in different parts of the body.
Step-by-step explanation:
The two-point discrimination test is used to measure the receptive field size for touch receptors. It assesses the density of sensory endings and the sensitivity to fine touch in different parts of the body. For example, the fingertips have a smaller distance between the two points of stimulation compared to the palm of the hand, indicating a higher density of touch receptors in the fingertips. The distance between the caliper points would likely be larger on the arm or shoulder due to a lower density of touch receptors in those areas.