Lab13.docx - Laura Carmona Lab 13 Touch Sensations(Somatic...

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Laura Carmona Lab 13: Touch Sensations(Somatic Sensations) Purpose The purpose of this experiment is to assess the ability to localize single-point touch stimulation. The test shows the functional condition of the neural pathway that conveys touch impulses from the stimulated area of the skin to its corresponding area in the cerebral cortex (where the sensation is interpreted). Hypothesis Touch can be quickly interpreted in the cerebral cortex. Materials & Methods Materials: Part A: -Pen/ Pencil -Willing subject -Camera Part B: -Compass/ 10 paper clips -Scotch or masking tape -Willing subject -Ruler -3x5” index card Part C: -Several familiar objects -Willing subject -Camera        Methods: Part A: 1. Display all materials used for this experiment on a table and take a composite picture of  them. 2. The subject (acting as patient) must have his eyes closed during the entire experiment. 3. Ask the patient to sit or stand up 4. Touch his hand with the pencil or pen. The subject should tell you the part of his body that  was stimulated. He should also touch the same area with the index finger of his other hand.  A normal individual should be able to touch same area or close to it. Repeat this step two  more times and record your observations. Take a picture of the patient showing him or her  performing the test. Patients who cannot pinpoint the stimulated area have nerve damage  along the pathway for light touch. 5. Perform this test on the areas listed below and record your observations: Anterior side of forearm Middle of forehead
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Middle phalanx of finger Posterior side of leg (calf)    o Identify the sensory tracts that convey nerve impulses from the areas specified in  step 4.  Include this information in your lab report.
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