Although each part of the body differs in terms of the two-point threshold value

Question

Although each part of the body differs in terms of the two-point threshold value, why is it that regardless of the part of the body, there is always some distance at which you perceive only one point even if you are being touched by two points? Refer to figure 10.5 of your textbook. Describe the relationship between the 2-point threshold distance and the relative density of receptor, receptor field size and the relative amount of sensory cortex in the brain that's associated with a particular part of your body by filling in the blanks. a) A small 2-point threshold suggests that the density of sensory receptors is relatively ___________ in that part of the body b) A small 2-point threshold suggests that the receptor field size is relatively _______________ in that part of the body. c) A small 2-point threshold suggests that the relative amount of sensory cortex in the brain associated with a particular part of the body is relatively __________________

Explanation / Answer

Answer 7:- Most people have two point threshold 2 to 4 mm on lips, which expands to between 30 to 40 mm on the back. The main difference is the incidence of nerve endings in a particular location, meaning that there are more sensing points on the lips than there are in the skin on the back. This is the main reason, regardless of the body part, there is some distance you perceive only one point by which you are touched.

As there are no figure given in the question, only one question is answered.

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