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TRAUMA RESOLUTION

MEMORY RECONSOLIDATION

memory recon2

“Time and space are modes in which we think and not conditions in which we live.” – Albert Einstein

Long-Term Memory is not as permanent as we once thought. The question of how permanent a long-term memory pattern of synaptic connections is once it has been consolidated is critical to our present discussion. It used to be thought that once memories had been converted from short-term form into long-term form, they were permanently stored and would remain more or less stable and resistant to decay or alteration, regardless of how many times they were remembered. This is a vision of long-term memory functioning like a CD-ROM which will play back a perfect rendition of its digital contents each time it is read, more or less, no matter how many times it is read. ROM means “read only memory”; the memory is not altered by the process of playback.

Newer evidence suggests that in many cases, memories are not “read only”, but rather are rendered fragile and changeable by the process of remembering. What most probably happens is that memories in long-term storage stay fairly stable until they are remembered. The process of remembering alters stored memories in some still unknown but physical fashion so that they become temporarily unstable and need to be consolidated (made stable) once again. The term used to described this new understanding is, consequently, “reconsolidation“.

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Just as is the case with the initial consolidation process, reconsolidation takes time to occur (another several hour period is required), and can be interfered with by various means so as to prevent reconsolidation from occurring. If you mess with the brain in just the right way during the period of memory reconsolidation, you can keep reconsolidation from happening, which effectively results in a weakening of that memory. The memory may not be erased outright, but it loses some of its strength.

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Therapists, like all other human beings, are guided and limited by their assumptions of what is possible. The new memory reconsolidation literature is important because it changes fundamental assumptions of what is possible to achieve. If you believe that memory is a fixed thing once it has been laid down, then you are going to work around that memory as you plan treatment options for patients who are suffering from memories. You will encourage new learning (the creation of new memories) to counterbalance and eventually outweigh the effects of older memories, for example. When you start to understand that memory is not really a fixed thing, then the possibility that you can simply go in and directly edit a troubling memory comes into reach. This is a radical possibility, fraught with potential.

 

HOW MEMORY WORKS

Stages of Memory – Encoding Storage and Retrieval

by Saul McLeod  published 2007

“Memory is the process of maintaining information over time.” (Matlin, 2005)

“Memory is the means by which we draw on our past experiences in order to use this information in the present.” (Sternberg, 1999)

Memory is the term given to the structures and processes involved in the storage and subsequent retrieval of information.

Memory is essential to all our lives. Without a memory of the past, we cannot operate in the present or think about the future. We would not be able to remember what we did yesterday, what we have done today, or what we plan to do tomorrow. Without memory, we could not learn anything.

Memory is involved in processing vast amounts of information. This information takes many different forms, e.g. images, sounds, or meaning.

For psychologists, the term “memory” covers three important aspects of information processing:

STAGES OF MEMORY

1. Memory Encoding

When information comes into our memory system (from sensory input), it needs to be changed into a form that the system can cope with, so that it can be stored. Think of this as similar to changing your money into a different currency when you travel from one country to another. For example, a word which is seen (in a book) may be stored if it is changed (encoded) into a sound or a meaning (i.e. semantic processing).

There are three main ways in which information can be encoded (changed):

1. Visual (picture)

2. Acoustic (sound)

3. Semantic (meaning)

For example, how do you remember a telephone number you have looked up in the phone book? If you can see it, then you are using visual coding, but if you are repeating it to yourself, you are using acoustic coding (by sound).

Evidence suggests that this principle coding system in short term memory (STM) is acoustic coding.  When a person is presented with a list of numbers and letters, they will try to hold them in STM by rehearsing them (verbally). Rehearsal is a verbal process, regardless of whether the list of items is presented acoustically (someone reads them out), or visually (on a sheet of paper).

The principle encoding system in long-term memory (LTM) appears to be semantic coding (by meaning). However, information in LTM can also be coded both visually and acoustically.

2. Memory Storage

This concerns the nature of memory stores, i.e. where the information is stored, how long the memory lasts for (duration), how much can be stored at any time (capacity), and what kind of information is held. The way we store information affects the way we retrieve it. There has been a significant amount of research regarding the differences between Short Term Memory (STM ) and Long Term Memory (LTM).

Most adults can store between 5 and 9 items in their short-term memory. Miller (1956) put this idea forward and he called it the magic number 7. He though that short-term memory capacity was 7 (plus or minus 2) items because it only had a certain number of “slots” in which items could be stored. However, Miller didn’t specify the amount of information that can be held in each slot. Indeed, if we can “chunk” information together, we can store a lot more information in our short-term memory.  In contrast, the capacity of LTM is thought to be unlimited.

Information can only be stored for a brief duration in STM (0-30 seconds), but LTM can last a lifetime.

3. Memory Retrieval

This refers to getting information out storage. If we can’t remember something, it may be because we are unable to retrieve it. When we are asked to retrieve something from memory, the differences between STM and LTM become very clear.

STM is stored and retrieved sequentially. For example, if a group of participants are given a list of words to remember, and then asked to recall the fourth word on the list, participants go through the list in the order they heard it in order to retrieve the information.

LTM is stored and retrieved by association. This is why you can remember what you went upstairs for if you go back to the room where you first thought about it.

Organizing information can help aid retrieval. You can organize information in sequences (such as alphabetically, by size or by time).  Imagine a patient being discharged from a hospital whose treatment involved taking various pills at various times, changing their dressing, and doing exercises. If the doctor gives these instructions in the order which they must be carried out throughout the day (i.e. in sequence of time), this will help the patient remember them.

HOW I USE MEMORY RECONSOLIDATION

In a session as the client recalls the traumatic material from long term memory, the neurons are weakened for about two to six hours. While they are unstable, we can now add new positive information and also update the memory file to the present time. When I ask the client to recall the memory again, there is less or no emotional charge left.

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