The two point threshold essay

I. Advantages

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In the two-point threshold experiment it is obtained just how close two distinct sharpened point can be together to get a person to feel two-points instead of a single. The value of the two-point tolerance is the nominal distance at which the subject can easily feel two distinct points. The rule behind this experiment is the fact that mechanoreceptors are not sent out homogeneously inside the skin of the human body. There are areas having a higher denseness and areas with a decrease density of mechanoreceptors, creating this certain area more or less delicate.

However , the smaller the distance is usually where the subject can truly feel two distinct points, a lot more mechanoreceptors should be present in this place, enabling a person to feel small details because part of the body system. In this research we is going to test the two-point tolerance at five ares with the body: the spine of the palm, the palm of the hands, fingertip, the back of the throat, and the shaft of the lower-leg.

With these presented areas, the fingertips will have a smaller two-point threshold than the back of the hand.

II. Materials and Methods

For this test a compass is used to apply two razor-sharp points to skin at the same time, and a ruler to measure the distance of such points. The independent varying for the experiment is the are where two-point threshold is scored. The centered variable is the two-point tolerance, or put simply the smallest length at which the niche can separate one and two points in one of the five tested areas. At first the compass is set on the smallest value, 2mm, and placed on a certain region. If the subject does not truly feel two distinct points the space between the details will be increased until the subject matter can experience two points. Like that the smallest range, the two-point threshold can be obtained.

3. Results

The Two-Point Tolerance Values For a lot of Subjects

Calculations/ T-Test

First the regular two-point threshold is calculated for equally areas by summing up all beliefs and separating the sum by the volume of values, six. For the spine of the hands it is an typical of 22. 4mm, and for the fingertips four. 71mm. Then your difference of each value for the average value is determined and put in to the solution to compute the standard deviation, where and is the number of subjects/values.

X-∅X (back of hand)

⇒ sq .

X-∅X (fingertips)

⇒ square

some, 4

19, thirty six

a couple of, 71

7, 34

4, 4

19, thirty-six

0, 71

0, your five

six, 4

54, 76

5, 3

28, one particular

18, 6

275, 56

zero, 3

0, one particular

7, 6

57, seventy six

one particular, 7

2, fifth 89

six, 4

40, ninety six

1, 7

2, fifth there�s 89

you, 4

1, ninety six

you, 3

1, 69

The squares intended for both impartial variables will now be summed up and divided by simply n-1= six before the sq . root is usually taken.

Back side of the palm:


To calculate the T-value the difference of the average values is usually subtracted by the square root of the total of the two SD sq divided by the number of subjects, 7.

The calculated T-value for this experiment is being unfaithful, 46.

The standard Two-Point Threshold and Regular Deviation pertaining to the Convenience and the Back side of the Hand

The graph shows clearly the fact that fingertips possess a much small two-point threshold with an average of 4. 71mm, than the back of the hands with twenty-two. 4mm. It also shows that the standard deviation to get the fingertips is much reduced with ±2. 69mm than the standard change of the themes at the back of the hand with ±8. 85mm.

IV. Bottom line

The results with the experiment support the speculation that the convenience have a compact two-point tolerance than the back of the palm. It is maintained the average two-point threshold of both areas, while the fingertips have and average of 4. 71mm and the back of the hand shows and average consequence of 22. 4mm as two-point threshold which can be almost 5 fold greater in comparison to the average fingertip value. The T-test is actually a statistical speculation test to verify if the hypothesis is reinforced. In this try things out a T-value of 9. 46 was calculated to 6 degrees of independence. According to the stand there is a zero. 0001% possibility that the hypothesis is wrong. So in other words this kind of T-value helps the speculation with over 99%.

A source of problem is certainly the number of subjects inside the experiment. For a strongly reinforced hypothesis I recommend a follow up experiment with many more subjects to be sure this speculation is still recognized because only a couple of too high or low figures can certainly change the results with only eight subjects. Likewise I would suggest to have only one specialist in the followup experiment because in this experiment there were eight testers, 1 for each subject and everybody measures different. So rather than having individual error included from one specialist, we have problems involved from seven. The final source of problem is within the calculations. Rounding errors here and there can make a difference if the the desired info is close together.

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