As a mean of measure, electric field sensing tells us about a strange and invisible physical world. Nervous Field introduces electric field sonification, as a physical channel and inference framework. According to the measured field strength, the sound, the colour of the sound, and the volume of the sound are varied. Thus, an improvised piece of music is created from the most simple parts. The sound installation refers to the concept of aleatory music, based on aspects of chance and improvisation, as used by John Cage, Pierre Boulez, and Iannis Xenakis.