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Relapse of fear following fear extinction. Fear is reduced following fear extinction, as assessed during extinction retrieval test the next day after training. However, fear can return by the following mechanisms: spontaneous recovery with the passage of time after fear extinction, reinstatement due to an exposure to the unsignalled US or renewal with exposure to the fear conditioning context that is different from extinction context (Myers and Davis 2007; Singewald et al. 2015).
