Thought
From Tardis Wiki, the free Doctor Who reference
Thought was the process of the mind thinking, or having an idea. The primate cortex was the segment of the brain responsible for thought. (PROSE: Time and the Rani)
Thought travelled at the speed of light. (PROSE: The Sands of Time) The Vardans could travel along any form of broadcast wavelength, including thought. (TV: The Invasion of Time) Light was able to travel at the speed of thought. (TV: Ghost Light)
