Lab Report On Sensory Threshold Essay Example for Free

Lab Report On Sensory Threshold Essay Lab report on Sensory Threshold In this lab the purpose is to test the sensory threshold of a human body. To say it in terms that are easier to understand, we are testing how accurate certain points are on a body with response to touch. We are using three points on the body, the forearm, palm, and index finger. With these three points we will be testing to see how sensitive each point on the body is by measuring the distance of which we can feel one or two points. The part of the brain that allows us to feel, the somatosensory cortex, is mapped out in relation to which parts of the body it processes its touch. Parts of our bodies have different densities of pressure receptors, the densities of these receptors correlates to the amount of brain tissue devoted to processing the somatosensory information. The face for example has a high densities of pressure therefor the somatosensory cortex has a large amount of area for the face, compared to the leg that doesnt have as much pressure receptors, and therefore uses a small area of the somatosensory cortex. (See illustration Fig. 511) With this information about how touch relates to the somatosensory cortex I expect that the index finger will be the point where we are the most sensitive then the palm followed by the forearm. The index finger should be able to detect the smallest distance between pokers than the palm or the forearm. To test the threshold of the human body we took a divider with two sharp points on the end of it. With the pointer we were able to set it to different measurements. We used measurements from .25 centimeters to 4 centimeters with an increment of .25 centimeters. After me measured the distanced out we taped the individual with the point, set to a certain distance, on either ; the forearm, palm, or index finger. The individual then had to decide wether we poke them with ether one or two points. Every once and a while we would tap the individual with one point so that they wouldnt be able to just guess that we were using two points. To keep everything on track we chose one side to do the testing on, and varied the distance of the pointer throughout the experiment and also the location of the tap. After conducting this experiment we compiled all of the data from every PSY  201 lab class and averaged the results together to give us a larger testing group. With the data we took the average of the percent correct for each distance for each position on the body. (see fig 1.1 From the data we noticed that the index finger had the greatest sensitivity with 67% of the answers were correct at .25 centimeters. The forearm seemed to be the next sensitive at .25 centimeters with 22% answering correct. The palm seemed to be the least sensitive at the smallest distance, .25 centimeters, with only 18% getting it correct. In the smallest distance there seems to be some what of a deviation from what the rest of the data states, because in the rest of the data the palm seems to be more sensitive with the percents being higher with correct answers, so it seems that the palm is more sensitive than the forearm. As the distance of the pointers increased so did the percent of correct answers, with a larger pint it seems as though it is easier to distinguish between on and two points. The index finger started to reach 100% correct at the distance of 1.75 centimeters, compared to the palm obtaining 100% correctness at 2.5 centimeters and the highest that the forearm ever got was 78% correct at 4 centimeters. This data seems to show the relation to he area of the brain tissue used in the somatosensory cortex does relate to the sensitivity of a particular area. The finger has the largest area then the palm has the second most area followed by the forearm with the least area amount. This experiment happened as I thought it would with the finger being able to detect the smallest distance followed by the palm and then the forearm. The index finger data shows that it was able to detect a tap from two points at a distance of .25 centimeters apart 67% of the time that is a very good strong average proving that it is the most sensitive of the three. In the .25 distance for the palm the average was only 18% correct, yet when tested with a poker with a distance of .5 centimeters the average percent correct jumped up to 40%. It seem as tough there was an error at this distance for the palm perhaps both pointers didnt hit or even the tester might not of taped them good enough. This large of a jump deviates to much compared to the next increment to be correct. The rest of the percents seem to rise a little as the size goes up by around 2% to 18% seeming like they are a  normal jump. Just as I predicted the forearm is the least sensitive of the three, it never reached 100% at any distance and the numbers didnt get very high relaying that it is the least sensitive. In my graphs you will notice a trend, that as the distance of the pokers increases so does the percent correct.(fig 1.2-1.4) This is because by increasing the distance between the pokers your touching the same pressure receptors and so they translate easier wether it was one or two. Also the percents were the highest for the Index finger followed by the palm and then the forearm and the greater sensitivity relates back to the area used in the somatosensory cortex. Perhaps to better test the points on the body we could use a smaller distance an see how small of a distance the index finger can notice this would give us a better idea how sensitive the fingers are. This data compile d from our experiment helps to support the idea that the more sensitive parts of our body use more brain tissue in the somatosensory cortex.

The Game Epidemic :: essays research papers

Andrew, Chuck, and Kevin played all night and skipped class the next day. They, along with thousands of others across the country, purchased Halo 2 at midnight the day the much-anticipated game was released in stores. Students and company employees called in sick that next day claiming the Halo 2 flu as their reasoning. Halo 2 is only one of a multitude of games distributed for use on Microsoft’s Xbox, Sony’s Playstation 2, and Nintendo’s Gamecube. American society is experiencing an epidemic as a result of many young people spending hours upon hours playing video games. The National Institute on Media and the Family is one organization founded â€Å"to build healthy families and communities through the wise use of media.† This institute wants to raise awareness of the harmful effects of playing too much. These effects include violence, lack of independent thought, and a false sense of reality.   Ã‚  Ã‚  Ã‚  Ã‚  Founded in 1996 by David Walsh, Ph D, NIMF works to maximize the benefits and minimize the harms of the media. The organization does this through research, education, and advocacy, even though they are a non-partisan, non-profit organization. Its website provides information for parents to use when selecting games for their children and raises awareness about the effects that come with video games. One of these deals with the environment of the games. According to NIMF, â€Å"Game environments are often based on plots of violence, aggression, and gender bias.† Additionally, women are often portrayed as helpless or sexually provocative. The number of hours played under these false settings can often give a false sense of reality. Gamers then have trouble distinguishing between what is real and what is not.   Ã‚  Ã‚  Ã‚  Ã‚  Negative effects exist as a result of the environment and storyline of a video game. According to a study referenced on the NIMF web site, violent video games may translate into aggressive behavior. The child’s imagination is capture, and oftentimes he imagines that he is the character he plays on the game, which is another mesh of fantasy and reality. Questions have also been brought up in regard to children at a very young age being exposed to violent video games. It is true that violent behavior is also linked to abusive parents and siblings. However, video games are set apart from this influence because they are easier to regulate.   Ã‚  Ã‚  Ã‚  Ã‚  Another cause for concern comes from the storyline many video games create.

Inherent Risk Essay

Inherent risk Computerizing risk Non-routine transactions (Beasley 2010, p268) ‘Transactions that are unusual for the client are more likely than routine transactions to be incorrectly recorded, because of the client often lacks experience in recording them. ’ Why it is risk: Santos use a series of computerizing or IT technology to support their business for increase market competition. IT technology has been used for trade ordering systems between customs and Santos. Customers can order or purchase goods online. Therefore, non-routine transactions might occur if customers not familiar with the computerizing system. What’s more, Computerizing system would always make the same mistake, if the system has not designed properly. Thus, It might also contain some misstatement of transactions or increase opportunities that the transaction record incorrectly, such as , some of sales transactions might record in ‘other income’ due to computerizing system design mistake. Misstatement of sales account would lead to estimate wrong actual profit at the end of financial year, thus it contain risks to estimate wrong also affect the Evidence: Make sure that the computerizing system had been designed properly; review the computerizing system to identify whether there are some mistakes. Investigate sales account and other income account, identify whether every transaction has been recorded correctly. Management risk Factors related to fraudulent financial reporting and misappropriation of assets (ASA 240 incentives/pressures) Adverse relationship between the entity and employees with access to cash or other assets susceptible to the theft may motivate those employees to misappropriate those assets, for xample: promotions, compensation, or other rewards inconsistent with expectations. Management and weaknesses in internal control may be present when misstatement due to either fraudulent financial reporting or misappropriation. Why it is risk (ASA240 ) Asset misstatement or been record incorrectly due to motivation that theft could benefit from it. Weak management of internal environment would lead to fraud or misst atement happened by personal motivation.

Magnetic Resonance Imaging (Mri) and Computed Tomography...

Magnetic Resonance Imaging (MRI) and Computed Tomography Scan (CT) Modern medical technology allows physicians to capture detailed images of the body for diagnosing and treatment planning of various health issues. Radiologists use imaging technologies to diagnose or treat diseases. Interventional radiology is the performance of medical procedures with the guidance of imaging technologies. Acquisition of medical imaging is usually performed by a radiologic technologist and the results are interpreted by Radiologists, medical doctors that specialize in radiology. While Magnetic Resonance Imaging (MRI) and Computed Tomography Scan (CT) are useful for diagnosing and treating illnesses, each has their own health risks and benefits.†¦show more content†¦When radiological examination is recommended by a physician, the expected benefit received from the test will outweigh the potential radiation risks involved. MRI uses strong magnetic fields to align atomic nuclei (usually hydrogen protons) within body tissues, then uses a radio signal to dist urb the axis of rotation of these nuclei and observes the radio frequency signal generated as the nuclei return to their baseline states.MRI scans do not expose patients to radiation, but the high force magnetic field used can cause significant problems if proper precautions are not met. Magnetic force used can cause metallic devices or implants to malfunction or be dislocated with the body. Images can be distorted by metal and electronic objects outside the body, due to interfere with the magnetic field of the MRI unit. Over exposure and unnecessary use of these imaging modalities can cause health risk. The expected benefits received from possible early and the ability to evaluate and properly treat diseases outweighs the potential radiation risk. 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