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Sensory lab

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Sensory lab Sensory lab Document Transcript

  • Yenning Lee<br />September 28, 2010<br />Period 3<br />Touch Sensitivity Lab<br />Introduction<br />The skin of the human body has many touch receptors. However, these touch receptors are spread out across the skin with some areas having a denser number of receptors. In the following activity, the palm, volar, fingertips, forearm and neck will be subjected to a two-point touch discrimination to determine which area is the most sensitive to touch. <br />Procedure<br />The experiment will be conducted by pairs of students. One student will have their eyes closed while another student will mark a point with a pen on a particular area that is to be tested on (for example, the palm or the fingertips). With their eyes still closed, the student being marked on will use their own pen to mark the point they felt. The two points will then be measured in to the closest distance in millimeters. 5 trials will be made on each body part and the experiment will be repeated on the palm, volar surface (back of the hand), fingertips, forearm and back of the neck. <br />Data and Observation<br />Figure 1<br />StudentPalmVolarFingertipsForearmBack of the Neckmonty3262610tony182218david91141117sirin1094911robin12103149yenning7731915lily71142723Amelia61152313grace41032618almu101661824curtis993917tevin6821920Anavi10103126charlisa521185Mean7.0710.213.5016.9314.00<br />Each number presented by the student is an average of data from five trials rounded to the nearest millimeter. The mean at the end of the chart refers to the total average of the dataset of all students on the categorized body part. <br />Figure 2<br />PalmVolarFingertipForearmNeckPalmxSVSVSVSVolarxVSSAFingertipxVSVSForearmxNNeckx<br />Key: S = Significant, VS = Very Significant, N = Not Significant, A = Almost Significant<br />Conclusion<br />As can be observed in figure 1, the fingertips has the least difference in distance between points made, making it the most sensitive surface to touch out of all the body parts. The forearm has the largest average distance between points, making it the least sensitive part. However, it should be considered that there was no particularly assigned finger to experiment on meaning that each student may have conducted the activity on a different finger each time. This can produce errors as it is not know whether or not each finger has the same amount of touch receptors. The data can be seen as a pattern since the largest surface areas out of the group, the forearm and the back of the neck has the largest average difference between points. Thus, the area of the surface tested on may have an effect on the results as large body parts like the forearm may have touch receptors more spread out on the area than the fingertips which may have densely packed touch receptors due to its small surface area. Figure 2 represents the significance of the data of each body part compared to another using the statistics program Graphpad. According to the chart, the data set with the largest difference, the fingertips and the forearms have a very significant difference meaning there is little to no chance that the data sets can share the same figures. However, the forearm and neck having only an average difference of 2.93 millimeters is listed as not significant meaning that it is likely that the data sets may share the same figures. <br />