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Post-traumatic amnesia (PTA) is a state of confusion that occurs immediately following a traumatic brain injury (TBI) in which the injured person is disoriented and unable to remember events that occur after the injury. [1] The person may be unable to state their name, where they are, and what time it is. [1]
A person experiencing TGA has memory impairment; with an inability to remember events or people from the past few minutes, hours or days (retrograde amnesia) and has working memory of only the past few minutes or less, thus they cannot retain new information or form new memories beyond that period of time (anterograde amnesia). [4]
Therefore, despite anterograde amnesia preventing Wearing from learning new bits of information that can be explained in words (declarative memory), and preventing him from storing new memories of events or episodes (also part of declarative memory), he has little trouble in retaining his musical abilities (procedural memory), though he has no ...
Post-traumatic amnesia is generally due to a head injury. Traumatic amnesia is often transient, but may be permanent or either anterograde, retrograde, or mixed type. The extent of the period covered by the amnesia is related to the degree of injury and may give an indication of the prognosis for recovery of other functions.
Post-traumatic osteoarthritis is the most common variation of post-traumatic arthritis. [3] Between 20 and 50% [ 4 ] of all osteoarthritis cases are preceded by post-traumatic arthritis. Patients having post-traumatic osteoarthritis are usually younger than osteoarthritis patients without any previous physical injuries.
Head injury can give rise to either transient or persisting amnesia. Occasionally, post-traumatic amnesia (PTA) may exist without any retrograde amnesia (RA), but this is often more common in cases of penetrating lesions. Damage to the frontal or anterior temporal regions have been described to be associated with disproportionate RA.
Patient N.A. (born July 9th, 1938) was an American man who developed anterograde amnesia as a result of a fencing accident. He was a patient studied by Larry Squire, a professor of psychiatry, neuroscience and psychology at the University of California. The cause of his amnesia was found to be a thalamic lesion extending to the hypothalamus.
Retrograde amnesia is defined as the loss of memory of events and experiences occurring prior to an illness, accident, injury, or traumatic experience such as rape or assault. The amnesia may cover events over a longer or only a brief period. Typically, it declines with time, with earlier memories returning first. [9]