Experiment 1- Two-point threshold in touch perception The density of touch recep

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Experiment 1- Two-point threshold in touch perception The density of touch receptors in some parts of the body is greater than in other parts, and, as a consequence, the areas of the primary somatosensory cortex that corresponds to different regions of the body are different sizes. Those areas of the body which have the largest density of touch receptors are represented by many neurons in the somatosensory cortex of the cerebrum. A map of the sensory areas of the brain therefore reveals that many neurons are devoted to the touch perception of the face (particularly the tongue and lips) and the hands, while relatively few neurons are devoted to the trunk/torso and legs. The density of touch receptors is measured by the two-point threshold test. The two points of an adjustable divider ruler are simultaneously placed on the skin with equal pressure, and the subject is asked it helshe feels two separate contacts. If two contacts are felt, the points of the divider are brought closer together and the test is repeated, until the subject reports feeling only one point of contact. The minimum distance at which two points of contact can be discriminated is the two-point threshold. Experiment Directions 1. Assign one person to be the subject for Trial 1, one or two people to be the experimenter(s), and one recorder 2. With the subject's eyes closed or looking away, the experimenter sets the divider (ruler with two points) wide apart. The experimenter places both points of the divider gently on the back of the subject's hand. The experimenter asks the subject how many points are felt. If the subject says "2", slide one of the points of the divider closer to the other at small increments (distance between the two points is now smaller) and repeat until the subject says "1". Now move the points back out just by 1mm and test again; the subject should say "2". Record this distance. Every once in a while (randomly), touch with just one point- so that the subject's response of "1" or "2" is actually reliable. 3. Perform two more trials (two more people) following this procedure. 4. Repeat Step 1 with the remaining parts of the body indicated below.

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This is done to prevent bias and make experiment more fair.

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