Source: Definition of Mild Traumatic Brain Injury Developed by the Mild Traumatic Brain Injury Committee of the Head Injury Interdisciplinary Special Interest Group of the American Congress of Rehabilitation Medicine.
J Head Trauma Rehabil 1993:8(3):86-87
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Computer Analogy
Many researchers will point to memory as being the most common symptom after brain injury. As earlier said, while it is a problem to some degree in every case, I believe that this focus misses the point. Problems with memory are to be expected with damaged neural connections and related pathology, regardless of whether pure memory ability has been compromised.
Once again, I find it helpful to use the computer as an analogy. The first analogy is the comparison between short term and long term memory, and RAM versus hard drive memory on your computer. If you have gotten this far into a web page, you probably understand how your computer uses and records information. That which you are using at this moment, is being used by your computers RAM, available to you so long as you keep this window open and supply power to your computer. But cut the power or close the window and this information will be lost, unless of course you have stored it in some way on your hard drive. That data which you have stored on your hard drive, can be retrieved the next time you turn on your computer, subject of course to your ability to find where it is that you stored it.
The terms used in brain and memory research of short term and long term memory are equivalent to the same process. Short term memories are those you are using now, long term are those you can retrieve from your brain memory banks. The science of human memory is largely a study of how information gets transferred from one to the other, through what is called encoding.
Yet, there is a more important factor when considering memory problems related to diffuse axonal injury, and that is the input factor. Your mind cannot remember what did not get inputted. What is only partially inputted, will probably not be remembered, or will be remembered improperly.
Try this experiment. While holding down your command key, click on the following three URL's. With the first, allow 5 seconds to download and then click on stop button. With the second, allow 10 seconds, and with the third, allow a full 60 seconds. Now if you have a direct internet connection, the equivalent to an exceptional brain processing speed, you would get all of the data on your first try. But if you are like the rest of us, you will get substantially more data with the last try than the first. The more data, the more complete your computers memory will be.
http://waiting.com/waitingtext1.html FIVE SECONDS
http://waiting.com/waitingtext2.html
TEN SECONDS
http://waiting.com/waitingtext3.html SIXTY SECONDS
In order to see the difference, just look at what percentage of each page is downloaded at the bottom of your memory window. Would you want to go through life with only 39% of your memories downloading?
Your brain works the same way. If its processing speed is slowed, or it is busy doing something else when the memory should be encoded, it will get incomplete data from which to encode the memory. If the data is incomplete, the memory will be also.
As stated on the previous page, memory problems can seriously complicate efforts to accommodate the information processing and fatigue problems that come with diffuse axonal injury. Memory problems are what most effects reliability in the work place after such injuries. The injured person who does not recognize these subtle memory problems, and find effective ways to accommodate for them, will get into trouble and could cause serious problems for an employer.
Fortunately, much of the focus in brain injury rehabilitation is focused on accommodating for memory problems and successful treatment strategies do exist, if two things are done:
Why subtlebraininjury.com?
subtlebraininjury.com is a website with a mission to educate with respect to the magnitude of brain injury which does not involve coma - injuries that have been labeled by names which grossly minimize their potential impact upon the life of the injured person. This site is brought to you by the advocates of the Brain Injury Law Group, a community of plaintiff's trial lawyers across the United States united by a common interest in serving the rights of persons with traumatic brain injuries and a common commitment to fully understanding the anatomic, medical and psychological aspects of TBI.
Additional Information
For a full treatment of the topic of brain injury, and recovering adequate compensation for those who have survived such injury, please visit our other pages. tbilaw.com A general treatment of all types of brain injury, including severe brain injury and concussion, with a special focus on the legal aspects of recovering full and adequate compensation for such injuries. tbilaw.com has been at the cornerstone of the web advocacy of the Brain Injury Law Group since it went online in 1996. waiting.com A page designed to assist those with issues regarding coma, especially in the acute phase when the doctors are saying "I just don't know." vestibulardisorder.com Addressing vertigo and dizziness resulting from trauma as well as information and resources for vestibular disorders.
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