| http://www.w3.org/ns/prov#value | - modulating this effect (for further discussion, see [45]).Impaired extinction of a second-order conditioned cue in S1 miceSome authors have posited that anxiety disorders such as PTSD can be maintained by a process of second-order conditioning, in which previously neutral stimuli acquire associative strength after pairing with trauma reminders and then act as additional stimuli maintaining fear [4
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