Interactions between transient and sustained neural signals support the generation and regulation of anxious emotion.

@article{Somerville2013InteractionsBT,
  title={Interactions between transient and sustained neural signals support the generation and regulation of anxious emotion.},
  author={Leah H. Somerville and Dylan D. Wagner and Gagan S. Wig and Joseph M. Moran and Paul J. Whalen and William M. Kelley},
  journal={Cerebral cortex},
  year={2013},
  volume={23 1},
  pages={
          49-60
        }
}
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… 
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