Basic

Basic was a scale that measured telepathic fields. Ood who had had their hind-brains removed registered Basic 5 as a norm. If this fell Basic Zero, it caused a 'Brainstorm' in Ood and made them collapse. Danny Bartock, a member of the Walker Expedition in Sanctuary Base 6, used this to disable the Ood by broadcasting it through a telepathic flare. (DW: The Impossible Planet/The Satan Pit)