A student gently touches a staple to her fingertip and to the back of her arm near her elbow. How are these sensations likely to differ? Or would they feel similar?
a. The sensation would feel like two points on the fingertip but is likely to feel like only one point on the arm.
b. The sensations would feel identical because the same object touches both locations.
c. The sensation would feel like touch on the finger-tips but like pain on the elbow.
d. The sensation would feel like two points on the arm but is likely to feel like only one point on the fingertip.
Answer: A
Rationale: Regions with high acuity, such as the fingertips, can detect the two separate, but closely spaced pressure points of the device, whereas less sensitive regions such as the lower back will perceive the same stimuli as only one pressure point.
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