Method:
Seat the test subject comfortably and have s/he close their eyes. Remove the dermatome from its protective casing. Leave the dermatome completely closed for the first test. Begin by applying the dermatome to the test subject’s cheek. Ask the test subject if s/he can distinguish between two points, or just feels one point touching their skin. If the subject cannot distinguish two points, then widen the dermatome by 1 mm, and retry the test. Continue in this fashion until the test subject is able to distinguish two separate points contacting their cheek. At this time, record the distance between the two points of the dermatome on a data sheet (in mm).
Proceed in this fashion to test the subject’s forehead, forearm, back of leg, palm, tip of index finger, and tip of thumb. After this process has been completed on one test subject, perform it on at least 2 other persons. Dependant variables in this experiment include: the size and specification of dermatome, and the inability of test subjects to see the dermatome touching their skin. The independent variable is different humans’ sensitivity to touch. There are no groups for this experiment because only 3 test subjects are used. Each subject was tested in the same manner as the others. Data were collected in mm on a spreadsheet, measuring the distance between dermatome points on human body parts when the test subject was finally able to distinguish two independent pressured points.
Data were analyzed by finding the average between all 3 test subjects of sensitivity to dual-point touch distinguishment.
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