power explanation (moisture control)

Primarily, they control the secretion of chemicals in the target’s brain and control the distribution of blood, cerebrospinal fluid, etc. in the brain. Rather than directly controlling the bioelectricity, it seems they change the conductive efficiency by controlling the fluid that acts as a catalyst for the electricity to flow through.

As such, there seem to be cases when their powers do not function against espers who can directly manipulate their bioelectricity, such as Electromasters. However, some speculate they would be able to force their way through that defense by raising their power.

Their method of reading minds without relying on another’s brain is likely also related to moisture.

- New Testament Toaru Majutsu no Index Volume 11 Between the Lines 3