网范文:“Research on human senses”。这篇文章作者主要讲述了作者对人体器官的感官上的探讨略论。在实验中，我们使用了递增序列和递减序列的措施来确定的阈值的感官（两点之间的距离），英语论文题目，在该阈值的皮肤可以检测到。从实验数据中，我们得出结论，英语论文，手指比其他部位的皮肤具有较高的灵敏度。 The density of receptors for each sensory system is related to the level of necessity for the stimulation to evoke sensation. As a consequence, different body parts have different levels of skin sensitivity. To test which part of our skin is more sensible than others,we used the method of limits in an experiment among a group of year one students at the University of Southampton to find out the sensory threshold of the five body parts: middle finger, forehead, cheek, forearm and calf. In the experiment, we made use of the ascending series and descending series of the method of limits to determine the threshold of sensory (distance between two points of compass) at which two points of the skin can be detected. From data of the experiment, we conclude that finger have higher sensitivity than other parts of skin. When we touch our skin,different part of skin have different level of sensitivity.Some part of skin is dull,while some part of skin is sensitive.It is because different region of brain receive information from different part of body.Martin, Carlson, and Buskist (2017) explained that Some parts of the brain are disproportionately involved in certain bodily movements, such as those involving the lips and hands(P126). How can we measure the sensitivity of skin?We choose some students from a year 1 practical class as participants randomly, and each was designated a body part, finger, calf, cheek, forearm, and forehead. In the experiment,we use method of limits,which is used to determine the threshold of sensory feeling by either gradually increasing and/or decreasing the magnitude of the stimulus in discrete steps until the stimulus becomes noticeable or unnoticeable by the participant. Martin, Carlson, and Buskist (2017) think that the most common measure of the tactile discrimination of a region of skin is the two-point discrimination threshold.To determine this measure, an experimenter touches a person with one or both legs of a pair of dividers and asks the person to say whether the sensation is coming from on or two points(P179). According to the theory above, we touched the participant with two or one point to test the discrimination of different part of skin.To insure the accuracy of the result,we set a high standard of answering( 3 out of 4 trials correct). Besides, we control the variable of gender and age to make sure that the difference of threshold is not because of the two variable. Participants in the study were recruited by convenience sampling, as there were 120 year one students who study the module Empirical Studies at University of Southampton. The average age of 120 participants in the group was about 19.98, and there was a high female to male ratio(97:23). Participants were then separated into groups of four or five depending on where they happened to sit next to or close to and within themselves, they decided what area of the body part they wanted to assigned to. Then the tester will start the experiment. Independent measure was used in the experiment as different participants were used in each condition of the independent variable. Independent variables (IV) were body parts that the participants were assigned to (Calf, forearm, cheek, middle finger and forehead) while the dependent variable (DV) was the sensitivity (Threshold at which two points of the skin can detected) The DV was measured using the method of limits, which is used to determine the threshold of sensory feeling by either gradually increasing (Ascending series) and/or decreasing (Decending series) the magnitude of the stimulus in discrete steps until the stimulus becomes noticeable or unnoticeable by the participant.Ascending series is to set the distance between divider points to 2mm and increase the distance to 12mm until two points are detected, while descending series is to set distance started at 12mm and decrease the distance until two points can no longer be detect.The procedures of ascending series and descending series were both performed four times, two with 2 points, two with 1 point.Compared to practice1,only when the participant was correct on 3outof the 4 trials can the procedure stopped. Ruler was used to measure the distance between the points of the compass (cleaned by antibacterial wipes before use) before the simulations. A “Results sheet for each body part” was used for each body part and each participant while a “Small Group Results Summary sheet” was used to collect results from each group (all 5 body parts). According to table 1,calf has the highest mean threshold of sensitivity of 7.52 while finger has the lowest mean threshold of sensitivity of 2.36. And ,the mean threshold of sensitivity of forearm, forehead, calf and cheek are all relatively close (ranging from 6 to 7); besides, the mean threshold of the finger is comparatively low and is further away from that range.In addition, the highest standard deviation of the body part is 2.73 of calf while the lowest is 1.15 of finger. Therefor,we can conclude that, calf has the greatest devotion to the data of thresholds, whilst finger contribute least.And,the data of distribution of threshold in the calf group is positively skewed while the data from the other body part groups tend to be more normally distributed. |
