Using the threat probability task to assess anxiety and fear during uncertain and certain threat.

@article{Bradford2014UsingTT,
  title={Using the threat probability task to assess anxiety and fear during uncertain and certain threat.},
  author={Daniel E. Bradford and Katherine P. Magruder and Rachel A. Korhumel and John J. Curtin},
  journal={Journal of visualized experiments : JoVE},
  year={2014},
  volume={91},
  pages={
          51905
        }
}
Fear of certain threat and anxiety about uncertain threat are distinct emotions with unique behavioral, cognitive-attentional, and neuroanatomical components. Both anxiety and fear can be studied in the laboratory by measuring the potentiation of the startle reflex. The startle reflex is a defensive reflex that is potentiated when an organism is threatened and the need for defense is high. The startle reflex is assessed via electromyography (EMG) in the orbicularis oculi muscle elicited by… 

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