YenningLee
September28,2010
Period3
Touch Sensitivity Lab
Introduction
The skinof the humanbodyhas many touchreceptors.How...
Figure 2
Palm Volar Fingertip Forearm Neck
Palm x S VS VS VS
Volar x VS S A
Fingertip x VS VS
Forearm x N
Neck x
Key:S = S...
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Sensory lab

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Sensory lab

  1. 1. YenningLee September28,2010 Period3 Touch Sensitivity Lab Introduction The skinof the humanbodyhas many touchreceptors.However,thesetouchreceptorsare spread out across the skinwithsome areashavinga densernumberof receptors. Inthe followingactivity, the palm,volar,fingertips,forearmandneckwill be subjectedtoatwo-pointtouchdiscriminationto determine whichareaisthe mostsensitive totouch. Procedure The experimentwill be conductedbypairsof students.One studentwill have theireyesclosed while another student will mark a point with a pen on a particular area that is to be tested on(for example, the palmor the fingertips). Withtheireyesstillclosed,the studentbeingmarkedonwill use their ownpento mark the pointtheyfelt. The twopointswill thenbe measuredintothe closestdistance inmillimeters. 5trialswill be made oneachbodypart and the experimentwillbe repeatedonthe palm,volarsurface (backof the hand),fingertips,forearmandbackof the neck. Data and Observation Figure 1 Student Palm Volar Fingertips Forearm Back of the Neck monty 3 2 6 26 10 tony 1 8 2 21 8 david 9 11 4 11 17 sirin 10 9 4 9 11 robin 12 10 3 14 9 yenning 7 7 3 19 15 lily 7 11 4 27 23 Amelia 6 11 5 23 13 grace 4 10 3 26 18 almu 10 16 6 18 24 curtis 9 9 3 9 17 tevin 6 8 2 19 20 Anavi 10 10 3 12 6 charlisa 5 21 1 8 5 Mean 7.07 10.21 3.50 16.93 14.00 Each numberpresentedbythe studentisanaverage of data fromfive trialsroundedtothe nearest millimeter.The meanatthe endof the chart referstothe total average of the datasetof all students on the categorizedbodypart.
  2. 2. Figure 2 Palm Volar Fingertip Forearm Neck Palm x S VS VS VS Volar x VS S A Fingertip x VS VS Forearm x N Neck x Key:S = Significant,VS=VerySignificant,N =Not Significant,A = AlmostSignificant Conclusion As can be observed infigure 1,the fingertipshasthe leastdifference indistance betweenpoints made,makingitthe most sensitivesurface totouchoutof all the bodyparts. The forearmhas the largestaverage distance betweenpoints,makingitthe leastsensitivepart. However,itshouldbe consideredthatthere wasnoparticularlyassignedfingertoexperimentonmeaningthateach studentmayhave conductedthe activityona differentfingereachtime.Thiscanproduce errorsas it isnot knowwhetherornoteach fingerhasthe same amountof touch receptors. The datacan be seenasa patternsince the largestsurface areasoutof the group, the forearmandthe back of the neckhas the largestaverage difference betweenpoints. Thus,the areaof the surface testedonmay have an effectonthe resultsaslarge bodyparts like the forearmmayhave touch receptorsmore spreadout onthe areathan the fingertipswhichmayhave denselypackedtouchreceptorsdue toits small surface area. Figure 2 representsthe significanceof the dataof each bodypart comparedto anotherusingthe statisticsprogramGraphpad. Accordingto the chart, the data set withthe largest difference,the fingertipsandthe forearmshave averysignificantdifference meaningthere islittle to no chance that the data setscan share the same figures.However,the forearmandneckhaving onlyan average difference of 2.93 millimetersislistedasnotsignificantmeaningthatitislikelythat the data setsmay share the same figures.

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