Now here’s a paper with an interesting title: The dark matter of the brain

Author Saak V. Ovsepian argues that “the great majority of nerve cells in the intact brain do not fire action potentials, i.e., are permanently silent.” This is a remarkable claim, and it raises the question of what these silent neurons are doing. However, I didn’t find myself convinced of the existence of this ‘dark matter’.

Ovsepian points out that numerous studies have found that only a minority of the neuron