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睡眠中に一次記憶のデータの配列順が固定する Sleep Enforces The Temporal Sequence In Memory
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Sleep Enforces The Temporal Sequence In Memory
21 Apr 2007
記憶の一時的な順番をどのように脳が追跡するか、これまでは不明だった。
従来の研究で、長期記憶は睡眠中に形成されることが、このプロセスは夜間、脳が最近、記録された経験を脳が再生することに関与していることが明らかになっている。
新たに、睡眠は記憶の中身を強化摺るだけでなく、同時に、個々の経験の順番も（データとして）強化することが明らかとなった。それも、おそらく”前進forward"モードでの再生により強化されることが。
学生に三行句tripletsを暗記させ、一旦、睡眠をとらせて、目が覚めた後、チェックしたところ、forwardモードで暗記の内容を再生させたときにのみ、単語の思い出しrecallは強化していつことが判明。
We have usually quite strong memories of past events like an exciting holiday or a jolly birthday party. However it is not clear how the brain keeps track of the temporal sequence in such memories: did Paul spill a glass of wine before or after Mary left the party?
Previous findings from a research group headed by Jan Born at the University of Lübeck have confirmed the widely held view that long-term memories are formed particularly during sleep, and that this process relies on the brain replaying recently encoded experiences during the night.
The same research group now provides evidence that sleep not only strengthens the content of a memory but also the particular order in which they were experienced, probably by a replay of the experiences in "forward" direction.
Students were asked to learn triplets of words presented one after the other. Afterwards they slept, whereas in a control condition no sleep was allowed. Later, recall was tested by presenting one word and asking which one came before and which one came after during learning. Sleep was found to enhance word recall, but only when the students were asked to reproduce the learned words in forward direction.
This finding shows that sleep associated consolidation of memories enforces the temporal structure of the memorized episode that otherwise might be blurred to a timeless puzzle of experiences.
Sleep Enforces The Temporal Sequence In Memory
21 Apr 2007
記憶の一時的な順番をどのように脳が追跡するか、これまでは不明だった。
従来の研究で、長期記憶は睡眠中に形成されることが、このプロセスは夜間、脳が最近、記録された経験を脳が再生することに関与していることが明らかになっている。
新たに、睡眠は記憶の中身を強化摺るだけでなく、同時に、個々の経験の順番も（データとして）強化することが明らかとなった。それも、おそらく”前進forward"モードでの再生により強化されることが。
学生に三行句tripletsを暗記させ、一旦、睡眠をとらせて、目が覚めた後、チェックしたところ、forwardモードで暗記の内容を再生させたときにのみ、単語の思い出しrecallは強化していつことが判明。
We have usually quite strong memories of past events like an exciting holiday or a jolly birthday party. However it is not clear how the brain keeps track of the temporal sequence in such memories: did Paul spill a glass of wine before or after Mary left the party?
Previous findings from a research group headed by Jan Born at the University of Lübeck have confirmed the widely held view that long-term memories are formed particularly during sleep, and that this process relies on the brain replaying recently encoded experiences during the night.
The same research group now provides evidence that sleep not only strengthens the content of a memory but also the particular order in which they were experienced, probably by a replay of the experiences in "forward" direction.
Students were asked to learn triplets of words presented one after the other. Afterwards they slept, whereas in a control condition no sleep was allowed. Later, recall was tested by presenting one word and asking which one came before and which one came after during learning. Sleep was found to enhance word recall, but only when the students were asked to reproduce the learned words in forward direction.
This finding shows that sleep associated consolidation of memories enforces the temporal structure of the memorized episode that otherwise might be blurred to a timeless puzzle of experiences.
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