![A new study published in 'Science' identified the biochemistry of the brain and the neural circuits that trigger generalized fear.](https://imagenes.elpais.com/resizer/v2/L2YQKDYK55CZZAK2ABQS5TEOBA.jpg?auth=0edaa504ba356de16048c90fd697d197adac3b416480cb350c776cfad3fe1d85&width=414&height=233&focal=446%2C308)
Fear arises from chemical changes deep in the brain
A study with mice and post-mortem human tissues shows how generalized fear can occur even in the absence of objective threats
A study with mice and post-mortem human tissues shows how generalized fear can occur even in the absence of objective threats