LAB REPORT 8: THE FUNCTIONS OF THE INTEGUMENTARY SYSTEM Name and Lab Section Two Point Discrimination Test Record the minimum distance for each location where the 2 points can be detected. Note: You can make a set of two-point calipers from a paperclip. Simply bring the edges together and measure with a metric ruler the distances. A table of results is available in Canvas, if you do not have anyone to conduct the experiment on. Location Trial 1 Trial 2 Trial 3 Fingertip 2 (mm) 3 (mm) 3 (mm) 2.7 Palm 6 (mm) 8 (mm) 9 (mm) 7.7 Forearm 22 (mm) 20 (mm) 19 (mm) 48.3 Back of the neck 8 (mm) 7 (mm) 10 (mm) 8.3 Back of calf 27 (mm) 30 (mm) 25 (mm) 27.3 1. Using the data from the 2-point discrimination test, explain which location tested has the largest number of neurons per area and how the number of neurons relates to the receptive field size.
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- Fingertip: (2 + 3 + 2)/3 = 2.3 mm - Palm: (6 + 8 + 9)/3 = 7.7 mm - Forearm: (22 + 20 + 19)/3 = 20.3 mm - Back of the neck: (8 + 7 + 10)/3 = 8.3 mm - Back of calf: (27 + 30 + 25)/3 = 27.3 mm Show more…
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The following data were obtained from a subject by testing the two-point threshold for the calf region: mm 0 10 15 20 25 30 35 40 45 50 55 60 65 # of points sensed 1 1 1 1 1 1 1 1 2 2 2 2 2 The following data were obtained from a subject by testing the two-point threshold for the tip of the index finger on the its palmar surface: mm 0 1 2 3 4 5 6 7 8 9 10 # of points sensed 1 1 1 2 2 2 2 2 2 2 2 What do your results say about the size of the receptive fields on the tip of the index finger versus the calf region? What do the results say about the number of sensory neurons servicing a given area of the tip of the index finger versus the calf region?
Suman K.
Receptor Physiology 4. Define receptive field. 5. 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. How well did your results correspond to your predictions? 6. Explain how the error of localization correlates to the size of the receptive field as demonstrated by the tactile localization experiment. 7. Several questions regarding general sensation are posed below. Answer each by placing your response in the appropriately numbered blanks below. 1. Which cutaneous receptors are the most numerous? 2-3. Which two body areas tested were most sensitive to touch? 4-5. Which two body areas tested were least sensitive to touch? 6-8. Where would referred pain appear if the following organs were receiving painful stimuli: (6) gallbladder, (7) kidneys, and (8) appendix? (Use your textbook if necessary.) 9. Where was referred pain felt when the elbow was immersed in ice water during the laboratory experiment? 10. What region of the cerebrum interprets the kind and intensity of stimuli that cause cutaneous sensations?
Adi S.
a) Increases in the BOLD signal cause behavior. b) There is localization of psychological function in the brain. c) Changes in the BOLD signal in the medial temporal lobe reflect cognition. d) Neuronal recording is evidence of the modularity of the mind. 2. The principle of mass action assumes that: a) Psychological functions are localized in the brain. b) Memory is distributed equally across brain regions. c) Brain regions have qualitatively dissociable psychological functions. d) Memory is stored in the hippocampus. 3. Why did Morris (1989) conclude that the NMDA receptor antagonist, AP5 affected acquisition but not retention of place learning? a) Rats given AP5 were initially impaired at place learning but improved with further training. b) Rats given AP5 after acquisition showed sensorimotor impairments. c) Rats given AP5 after acquisition showed normal searching behavior in the quadrant that had previously contained the hidden platform. d) Rats given AP5 before training were slow to acquire place learning.
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