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# Dominant Hand Sensitivity

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by

## Sonora Garcia

on 27 March 2014

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#### Transcript of Dominant Hand Sensitivity

Manipulated Variable:
Variables:
Sensitivity to cold is stronger on our dominant hand because the dominant hand is used more often and therefore the nerves are more resistant to sensitivity.
Hypothesis
Materials
1.) Person
2.) Ice
3.) Thermometer
4.) Timer
5.) A bowl

Question:
What effect does ones dominant hand have on the sensitivity of cold?
Safety
Dominant Hand Sensitivity
By: Sonora Garcia
When you feel numb immediately
take your hand out of the cold water.
Dominant Hand
Condition 1: Right Hand
Condition 2: Left Hand
Condidtion 3: Ambidextrous
Controlled Variable
Environment
Temperature of water
Bowl
Responding Variable:
Sensitivity to cold
( How long the hands lasts in cold water )
Procedures
1.) Gather Materials
2.) Label: Left hand dominant, Right hand dominant, Ambidextrous
3.) Keep the water temperature and the environment and the water bowl the same
4.) Be sure to use a timer to measure how long the hand lasts in cold water
5.) Perform the experiment for a right hand, left hand and an ambidextrous person.
6.) Record the time in cold water and compare changes between the right hand, the left hand and ambidextrous person.
7.) Repeat experiment 3 times for reliability

Dominant Hand
Sensitivity To Cold
(seconds)
Right
Left
Both
Data Table
Trial 1
Trial 2
Trial 3
Average
32 ( L )
44 ( R )
43
50
35
35
44
44
42
47
39
43
39
45
43
54
30
37
38.3
44.3
42.6
50.3
34.6
38.3
Pictures
Results
The results of the data were that the ambidextrous left hand lasted the least in cold water. So that means that its the most sensitive. The one that lasted the most was the left handed person with his left hand. This proves that his dominant hand is less sensitive.
Conclusion
As the dominant hand changed from Ambidextrous to right to left the sensitivity to cold increased. The average for Ambidextrous was 34.6 seconds. The average for left was 50 seconds. The average for right hand was 38 seconds. Ambidextrous was 3.4 seconds less the left hand. Therefore the dominant left hand lasted more in the cold water.
Abstract
The purpose of the experiment was to find out if the dominant hand was more resistant to cold water. The procedure involved the person dipping their hands in cold water for as long as they could stand and pull out their hand once it was just to cold. I did this 3 times per person. The results were that your dominant hand IS less sensitive to cold water. What surprised me is that for the Ambidextrous person is more sensitive to cold in the right hand.
Bibliography
http://www.webmd.com/pain-management/features/whats-your-pain-tolerance?page=2
“A dominant hand -- your right hand, if you're right-handed, for example -- may interpret pain more quickly and accurately than the non-dominant hand, which may explain why the dominant side can endure longer. Hand dominance may also be linked to the side of your brain that interprets the pain, the researchers note.”
http://www.education.com/science-fair/article/sensitivity-heightened-dominant-side/
http://www.sciencekids.co.nz/experiments/dominantside.htm

“Others think the reason might have more to do with culture. The word ‘right’ is associated being correct and doing the right thing while the word ‘left’ originally meant ‘weak’. Favoring the right hand may have become a social development as more children were taught important skills by right handed people and various tools were designed to be used with the right hand.”

Graph
Right hand
Left Hand
Full transcript