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Anxious emotion can manifest on brief (threat response) and/or persistent (chronic apprehension and arousal) timescales, and prior work has suggested that these signals are supported by separable neural circuitries. This fMRI study utilized a mixed block-event-related emotional provocation paradigm in 55 healthy participants to simultaneously measure brief and persistent anxious emotional responses, testing the specificity of, and interactions between, these potentially distinct systems.doi:10.1093/cercor/bhr373 pmid:22250290 pmcid:PMC3513951 fatcat:fqvugo2okzfebgg6l6oy7tnhs4