Neurobiological mechanisms in the regulation of conditioned fear memory by the retrieval-extinction paradigm / 中华行为医学与脑科学杂志

Fear memories are temporarily suppressed after repeated retrieval, a phenomenon known as memory extinction.How to reduce or even eliminate fear memory is the key to the treatment of fear related diseases such as post-traumatic stress disorder(PTSD). A single extinction training based on Pavlov's fear regulation task could only inhibit the expression of conditioned fear memory traces, but it could not eliminate the acquired conditioned fear memory. However, according to the reconsolidation theory based on memory, the retrieval-extinction paradigm has a more lasting effect on the erasure and rewriting of fear memory, and can effectively prevent the return of fear memory. Studies have shown that extraction-regression is closely related to a variety of neurotransmitter receptors such as glutamate receptor(GluR), dopamine receptor(DAR), L-type voltage-gated calcium channels(LVGCs) and cannabinoid. Moreover, its effect is closely related with factors such as retrieval-extinction memory stage. At present, most of the researches on extracted boundary conditions only stay at the level of behavior, with little understanding and exploration on the level of molecular mechanism. From the perspective of molecular neurobiology, with different stages of memory and different types of receptors and molecular mechanisms, this research reviewed the mechanisms of retrieval-extinction in recent years.It provided valuable signaling pathways, molecular targets and research directions for the treatment of fear-related diseases such as PTSD.

Memory retrieval-extinction paradigm and its application on drug addicts / 中华行为医学与脑科学杂志

Based on the traditional fear extinction training paradigm, the retrieval-extinction para-digm rewrites fear memory within the reconsolidation window,and reduces their fear response by decreasing the valence of fear stimulus. From the perspective of psychology,the main reason of addicts relapse is that the intensive memory of the painful experience inspired when protracted withdrawal symptoms of drug depend-ence. The reduction of the sensitivity of drug related memory, which is the key of drug detoxification is to change the memory caused by drug related cues. The retrieval-extinction paradigm provides no drug treatment and a new non-invasive model for addicts,and a new perspective to reduce the relapse rate,and to improve the quality of life of addicts. We can do empirical research which using memory retrieval-estinction paradigm on drug addicts in the future.The memory retrieval paradigm can be applied to empirical research in drug ad-dicts in future.