This is possible using algorithms that filter out interference caused by external electrical activity.

ECONOMIST: Brainwave controllers

It estimates that the majority of homes will be able to solve any interference issues by fitting a filter, which it will supply free of charge.

BBC: Man watching TV

Such feedback was difficult to get in the past due to interference by local officials, who tried to filter out or downplay anything with negative overtones and play things up to their own advantage.

CNN: STORY HIGHLIGHTS