返回抑制是指对先前注意的位置上进行反应所表现出的滞后现象，是选择性注意的一个重要现象。
Inhibition of Return (IOR) is the hysteresis phenomenon shown by the reaction of the previous note on the location and it is a significant phenomenon to selective attention.
是脑内最重要的抑制性神经递质，其在调节颗粒细胞的返回抑制中起重要作用。
GABA( Y -aminobutyric acid) is the most important inhibiting neurotransmitter in the brain, which plays a great role in regulating feed-back inhibition of granular cell.
有研究表明，返回抑制不仅受到外源性注意定向的影响，同时也受到自上而下的策略性注意调控的影响。
Some researches have proved that Inhibition of return is not only influenced by exogenous attention, also by endogenous attention.
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