15. What is the relationship between the density of sensory neurons and the size
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15. What is the relationship between the density of sensory neurons and the size of the receptive field? GHINT directly proportional:-1. or indirectly proportional:1-1) 16. If the receptive field is small, what does that mean about that part of the body to discriminate between the two-point aesthesiometer? 17. Which body part had the greatest two-point threshold? What does that mean about the sire of the receptive fields? 18. Which body part had the least two-point threshola? What does that mean about the size of the receptive fields? 19. Explain what receptors were activated with 1 quarter on the forcarm versus 4 quarters on the forearn. Be sure to include the cutaneous receptors involved and whether they are tonic or phasio. 20. Explain the adaptation of temperature receptor results.Explanation / Answer
15. The density of sensory neurons is indirectly proportional to the size of the receptive field.
16. If the receptive field is small, that part of the body can discriminate very closely placed stimulus points to be different, in the two-point aesthesiometer.
17. The lips and the finger-tips have the greatest two-point threshold. This means that the size of the receptive fields in this area is smallest.
18. The back of the body has the least two-point threshold. The size of the receptive fields in this area is largest.
The minimum distance by which two touch stimuli can be perceived as separate stimuli varies from 2–3 mm on the lips and fingertips to over 60 mm on the back of the trunk.
20. Temperature receptors (thermoreceptors) show a moderate degree of adaptation. On exposure to cold, when skin temperature begins to fall, initially the person feels much colder than at a later stage, even when exposed to same cold environments. This is because when the temperature decreases, cold fibres increase their rate of firing and then adapt to the firing rate. Similarly, on sudden exposure to hot environment, the feeling of warmth is more intense in the beginning. This is because, when the temperature increases, warm receptors increase their firing rate before adapting to the rate.
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