The sternocleidomastoid muscle also known as the head turner, has the interesting feature to move the head sideways when stimulated unilaterally. Or, when stimulated on both sides simultaneously to let the head move forward.
In the performance that took place in Paradiso in Amsterdam NL at the TV3000 event organised by Hans Kerkhof, the sternocleidomastoid muscles were directly wired up to two public microphones situated on the left and right. The audience could battle for attention by speaking into the microphones, but when sounds would level out, the head dropped down as in negation.
tags: performance, electric muscle stimulation, negation