Amnesia is the incompetence to recall longstanding memories or to create new ones. The main symptoms that are associated with amnesia include: the ability to learn new information is impaired, some struggle in recalling new or past events, confusion or disorientation, loss of memory and the formation of false memories. The causes of amnesia include strokes, oxygen deprivation, head inflammation, brain injuries. Psychological trauma (physical, sexual or emotional abuse) has also been known to be a cause of amnesia.
There are two main types of amnesia, anterograde and retrograde amnesia. Anterograde amnesia is defined as the inability to create or remember new events after trauma. This means that people with anterograde amnesia cannot accumulate additional information. Retrograde amnesia is the opposite, meaning that the patient does not have recollection of events prior to their incident, but still can store new information.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2064941/
The main cognitive impairment that is associated with amnesia is the difficulty in recalling information
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MTT is the idea that the hippocampus is always involved in the retrieval and storage of episodic memories. This theory has the idea that every time an episodic memory is attained is it re-coded. The re-coding leads to the development of memory traces that are mediated by hippocampal neocortical neurons. Episodic memories are memories of autobiographical events, for example, a time and a place that aggravate an emotion. Semantic memories are thought to be able to be established in places aside from the hippocampus. The MTT proposes that hippocampus is vital for the retrieval of semantic and episodic memories, but semantic memories can be stored in the neocortex, and will be able to still be retrieved if damage to the hippocampus
Hippocampus is a small, curved region, which exists in both hemispheres of the brain and plays a vital role in emotions, learning and acquisition of new information. It also contributes majorly to long term memory, which is permanent information stored in the brain. Although long term memory is the last information that can be forgotten, its impairment has become very common nowadays. The dysfunction is exemplified by many neurological disorders such as amnesia. There are two types of amnesia, anterograde and retrograde. Anterograde amnesia is inability in forming new information, while retrograde refers to the loss of the past memory. As suggested by Cipolotti and Bird (2006), hippocampus’s lesions are responsible for both types of amnesia. According to multiple trace theory, the author suggests that hippocampal region plays a major role in effective retrieving of episodic memory (Cipolotti and Bird, 2006). For example, patients with hippocampal damage show extensively ungraded retrograde amnesia (Cipolotti and Bird, 2006). They have a difficult time in retrieving information from their non-personal episodic events and autobiographical memory. However, this theory conflicts with standard model of consolidation. The difference between these theories suggests that researchers need to do more work to solve this controversy. Besides retrieving information, hippocampus is also important in obtaining new semantic information, as well as familiarity and recollection (Cipolotti and Bird, 2006). For instance, hippocampal amnesic patient V.C shows in ability to acquire new semantic knowledge such as vocabularies and factual concepts (Cipolotti and Bird, 2006). He is also unable to recognize and recall even...
Tate, R. L., & Pfaff, A., Jurjevic, L. (2000)Resolution of disorientation and amnesia during post-traumatic amnesia. Journal of Neurology, Neurosurgery, and Psychiatry, 68, 178-185
Understanding the reasoning behind amnesia and the hippocampus is of critical importance in neuroscience. Discussed by Cipolotti & Bird (2006), LTM impairments can lead to anterograde and retrograde amnesia if the medial temporal lobe (MTL) is damaged bilaterally. Specifically, the two most important types of LTM related to anterograde and retrograde amnesia are episodic and semantic memories. Conversely, many researchers have long debated the true functions of the hippocampus and have allowed two theories to emerge. The standard model of consolidation (SMC) assumes that the hippocampus is important in consolidating LTM, while the multiple trace theory (MTT) argues that information is encoded by specific memory traces by the hippocampus. These two theories help further explain the vast functions of the hippocampus. However, in regards to amnesic patients, the SMC has proven to be more widely accepted due to reported results implying that the hippocampus is important in consolidating LTM. In contrast, in anterograde patients, memories can be retrieved through recollection and familiarity. In fact, it has been proposed that the recol...
One cause is benzodiazepine drugs, which are known to have powerful amnesic affects. This has also been recorded in non-benzodiazepine sedatives which act on the same set of receptors. Another cause is a traumatic brain injury in which damage is usually done to the hippocampus or surrounding cortices. It can also be caused by shock from psychological trauma or an emotional disorder. Illness, though much rarer, can also cause anterograde amnesia such as encephalitis, which is the inflammation of brain tissues do to some foreign pathogen. Lucy is diagnosed as having Goldfield’s Syndrome, which is the exact same thing as anterograde amnesia. She shows signs of short-term memory loss, her brain stores the new memories of the day has she lived however, after falling asleep she is unable to access these
Definition of memory and it's functions is difficult to illustrate by a single sentence. Consequently we use several metaphors to describe memory implicitly. Our beliefs, perceptions and imagination influence memory. The fact gave rise to memory being described as a reconstructive process, explaining that memory is not an exact record of a particular experience. Instead we bring various components together and fill in the blanks with our predisposed schemas while recalling. The metaphor building "an entire dinosaur skeleton from fossils" is the indirect way to describe memory as cognitive reconstruction. Remembering includes using schemas which are the mental representations of a concept, person or an event.They rejuvenate an incomplete memory such that it is perceived to be an undiminished one. Of course there are errors experienced when recalling which supports the idea of imperfect memory. These can be errors of commission, adding details which were not a part of the experience and errors of omission, which is excluding some aspects of the experience. In this paper I will support the selected metaphor and will provide evidence approving it.
Retrograde amnesia differs from anterograde amnesia in one important way, where the memory trouble occurs. With retrograde amnesia one will suffer from loss of memory for all memories that take place before the onset of the disorder. Except for a few isolated memories, one cannot bring to mind any memories from before their amnesia occurred. Over time one could start recovering their memories and recover their past. Anterograde amnesia refers to the inability to store memories into long term memory after the onset of amnesia. With anterograde amnesia one has trouble learning and remembering things after they have read them. All of one’s previous memories still exist however, and that individual has no problem remembering these events with anterograde amnesia. Retrograde amnesia, you lose past memories, anterograde
Amnesia, a severe long-term memory loss disease, is caused by damaged brain tissue. There are two different types of amnesia. Retrograde amnesia is also known as backward moving. This is when you have a hard time remembering the past, especially episodic memories. This occurs because of memory consolidation. Memory consolidation is the process of a new memory setting until it becomes permanently in the brain. If this process is disrupted, the memory may be lost (Hockenberry and Hockenberry page 265). Anterograde amnesia is also known as forward moving. This is when you are unable to form new
Anterograde Amnesia (AA) is commonly known as short term memory loss. It is the inability to form any new memories after a neurological or psychological trauma in the brain. “Current definitions of anterograde amnesia emphasize the presence of severe and permanent deficits for the recall of recent events (typically with poor recognition) that contrast with intact short-term memory, IQ, semantic memory, skill learning, simple classical conditioning, perceptual learning, and priming” (Aggleton, 2008, p. 1442). Also, according to Aggleton, AA causes the inability to recall autobiographical events (episodic memory). Research shows that damage to the diencephalon or frontal lobe can cause AA. Damage to the diencephalon impairs memory performance because it encodes new experiences for future recall and damage to the frontal lobe of the brain weaken memory performance because the it is involved in regulates access explicit memory (Mendev 2007). Duff, Wszalek, Tranel & Cohen (2008) stated...
I will first be discussing declarative memory, which is characterized by knowledge of facts and events. Much of our current knowledge of the structure and substrates of declarative memory derives from studies of amnesiac patients, from which we can derive two primary findings: declarative memory is separate from other forms of memory such as working and non-declarative memory, and function of declarative memory is dependent on structures
...Baddeley (1966) study of encoding in the short term memory and long term memory supports the MSM model on the mode of processing such that words are processed on recall and both models share the same opinion that processing does influence recall. Finally, the MSM model of memory states that all information is stored in the long term memory, however, this interpretation contrasts with that of Baddeley (1974) who argue that we store different types of memories and it is unlikely that they occur only in the LTM store. Additionally, other theories have recognised different types of memories that we experience, therefore it is debatable that all these different memories occur only in the long-term memory as presumed by the multi-store model which states the long term memory store as with unlimited capacity, in addition it also fails to explain how we recall information.
While there are several classified types of amnesia I choose to focus on retrograde and anterograde amnesia, because these are most common. Retrograde amnesia refers to the inability to remember events before the brain damage occurs, and anterograde is the inability to remember events after the brain damage. (2). Okay, so now I know the difference. One you cannot remember your past. The other you cannot remember your present. Now, the question to be posed is how exactly do these two degrees differ in relation to the way the brain operates when confronted with the trauma?
The human brain consists of many subsystems within the long-term memory. One of which is episodic memory. Episodic Memory is the remembrance of a phenomenal personal experience in terms of what, when, and where. This memory begins by retrieving information such as, words, objects, or faces; using this knowledge the episodic memory finds links and slowly transitions into recalling the complete memoir.
Hippocampus plays an important job in the formation of new memories about experienced events such as the episodic or the autobiographical memory. It is also a part of larger medial temporal lobe memory system responsible for general declarative memory. General declarative memory is a type of memories that can be explicitly verbalized. If damage to hippocampus occurs only in one hemisphere, our brain can still retain near-normal memory functioning. But even so the hippocampus is damage; some types of memory such as abilities to learn new skills will not be affected. The reason is because, some abilities depends on different types of memory and different regions of the brain such as procedural memory. Hippocampus also plays role in spatial memory and navigation. Many hippocampal neurons have “place fields” and the discovery of place cells in 1970’s led to the theory that hippocampus might act as cognitive
Memory is the tool we use to learn and think. We all use memory in our everyday lives. Memory is the mental faculty of retaining and recalling past experiences. We all reassure ourselves that our memories are accurate and precise. Many people believe that they would be able to remember anything from the event and the different features of the situation. Yet, people don’t realize the fact that the more you think about a situation the more likely the story will change. Our memories are not a camcorder or a camera. Our memory tends to be very selective and reconstructive.
The findings of Timothy A. Allen along with Norbert J. Fortin, and Erika Hayasaki, reveal further insight into the role episodic memory plays in everyday life for humans. Episodic memory can be understood as memory for personal experience. Episodic memory is a type of long term memory that individuals are consciously aware of; making it an explicit memory. With that being said, this type of memory allows people to relive and re-experience memories from their personal past in their mind. This is why many refer to episodic memory as mental time travel. Through mental time travel, individuals are able to recall the circumstances under which they encountered specific experiences. Circumstances can include concepts such as what, where, and when an experience happened. Given the power that this form of memory provides, it is argued that