Being anxious could be good for you in a crisis

[VMI77]

http://www.eurekalert.org/pub_releases/ ... 122815.php

Even more surprising for the scientists was the discovery that anxious individuals detect threat in a different region of the brain from people who are more laid-back. It was previously thought that anxiety could lead to oversensitivity to threat signals. However, the new study shows that the difference has a useful purpose. Anxious people process threats using regions of the brain responsible for action. Meanwhile, 'low anxious' people process them in sensory circuits, responsible for face recognition.

[parabelum]

It's fight or flight. But I really don't know if the notion of being anxious is good or bad. I presume it would depend on the individual, situation, time, place etc.
Interesting read however.

[suthdj]

"In a crowd, you will be most sensitive to an angry face looking towards you, and will be less alert to an angry person looking somewhere else," says lead author Marwa El Zein from the French Institute of Health and Medical Research (INSERM) and the Ecole Normale Supérieurein Paris.

Ummm, duh!

[Pawpaw]

In other words, when your spidey sense starts tingling you should pay attention to it!