This may sound like the stuff of Hollywood movies, and Hollywood has been fascinated with the amnesia plot for nearly a century, going all the way back to the film Garden of Lies from 1915 to more recent movies such as the Jason Bourne spy thrillers. You don’t remember anything about your life prior to waking up in the hospital. You were in a car accident, suffered a head injury, and now have retrograde amnesia. What if you woke up in the hospital one day and there were people surrounding your bed claiming to be your spouse, your children, and your parents? The trouble is you don’t recognize any of them. They have difficulty remembering episodic memories. People with retrograde amnesia cannot remember some or even all of their past. Retrograde amnesia is loss of memory for events that occurred prior to the trauma. Conversely, memory problems that extend forward in time from the point of injury and prevent the formation of new memories are called anterograde amnesia. Memory problems that extend back in time before the injury and prevent retrieval of information previously stored in long-term memory are known as retrograde amnesia. However, when presented the same puzzle several days in a row, although he did not remember having seen the puzzle before, his speed at solving it became faster each day (because of relearning) (Corkin, 1965, 1968).įigure 8.10 This diagram illustrates the timeline of retrograde and anterograde amnesia. and then you left the room for a few minutes, he would not know you upon your return and would introduce himself to you again. He also could not remember people he had met after his surgery. would read the same magazine over and over, having no memory of ever reading it-it was always new to him.
The brain damage caused by his surgery resulted in anterograde amnesia. Many people with this form of amnesia are unable to form new episodic or semantic memories, but are still able to form new procedural memories (Bayley & Squire, 2002).
This suggests that damage to the brain has resulted in the inability to transfer information from short-term to long-term memory that is, the inability to consolidate memories. The hippocampus is usually affected (McLeod, 2011). With anterograde amnesia, you cannot remember new information, although you can remember information and events that happened prior to your injury. Anterograde amnesia is commonly caused by brain trauma, such as a blow to the head. There are two common types of amnesia: anterograde amnesia and retrograde amnesia ( Figure 8.10). The only exception is the experiences that, at any time, he has had in the last minute or two. His episodic amnesia covers his whole life, from birth to the present. The outstanding fact about K.C.'s mental make-up is his utter inability to remember any events, circumstances, or situations from his own life. suffered a traumatic head injury in a motorcycle accident and then had severe amnesia. Endel Tulving (2002) and his colleagues at the University of Toronto studied K. AmnesiaĪmnesia is the loss of long-term memory that occurs as the result of disease, physical trauma, or psychological trauma. There are several reasons why this happens. However, all of us have at times felt frustrated, and even embarrassed, when our memories have failed us. You may pride yourself on your amazing ability to remember the birthdates and ages of all of your friends and family members, or you may be able recall vivid details of your 5th birthday party at Chuck E. Compare and contrast the two types of interference.Discuss the unreliability of eyewitness testimony.
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