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Fearful memories can be blocked
Source: Agencies |
December 11, 2009, Friday
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AMERICAN researchers have found a drug-free way to block fearful memories, opening up the possibility of new treatment approaches for problems such as post traumatic stress disorder, they reported on Wednesday.
The findings in people build on studies in rats that showed that reactivating a memory - by showing people objects that stimulate the fearful memory - opens up a specific time window in which the memory can be edited before it is stored again.
"Before memories are stored, there is a period where they are susceptible to being disrupted," said Elizabeth Phelps of New York University, whose study appears in the journal Nature.
Earlier studies have shown that drugs can be used to block fearful memories, but the results were not long lasting.
Phelps and colleagues based their studies on findings in rats that showed that old memories can be changed or reconsolidated, but only during a specific window time after the rat is reminded of the fearful memory.
That window of susceptibility is typically between 10 minutes after re-exposure to the object and 6 hours later, when the memory is stored once again in the brain.
The researchers applied these findings to people in a lab setting. First, they created a fearful memory by showing the volunteers a blue square, and then delivering a mild shock.
Once they had created the fear memory, they simply showed a blue square, which reminded them of the fear memory.
The team waited 10 minutes and then started a training period where the volunteers were repeatedly exposed to the blue square without a shock.
Phelps said simply delaying the exposure training so that it falls within a period during which the memory is susceptible to being edited made a lasting difference in the ability to block the fear memory.
A second group exposed to the blue square without the 10-minute waiting period, continued to show fear when exposed to the blue square.
The findings in people build on studies in rats that showed that reactivating a memory - by showing people objects that stimulate the fearful memory - opens up a specific time window in which the memory can be edited before it is stored again.
"Before memories are stored, there is a period where they are susceptible to being disrupted," said Elizabeth Phelps of New York University, whose study appears in the journal Nature.
Earlier studies have shown that drugs can be used to block fearful memories, but the results were not long lasting.
Phelps and colleagues based their studies on findings in rats that showed that old memories can be changed or reconsolidated, but only during a specific window time after the rat is reminded of the fearful memory.
That window of susceptibility is typically between 10 minutes after re-exposure to the object and 6 hours later, when the memory is stored once again in the brain.
The researchers applied these findings to people in a lab setting. First, they created a fearful memory by showing the volunteers a blue square, and then delivering a mild shock.
Once they had created the fear memory, they simply showed a blue square, which reminded them of the fear memory.
The team waited 10 minutes and then started a training period where the volunteers were repeatedly exposed to the blue square without a shock.
Phelps said simply delaying the exposure training so that it falls within a period during which the memory is susceptible to being edited made a lasting difference in the ability to block the fear memory.
A second group exposed to the blue square without the 10-minute waiting period, continued to show fear when exposed to the blue square.
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