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)
Dr. Who, akin to "Pan of old", had a pipe in which he played tunes on to help him think and get his thoughts straight. (PROSE: The Phoenix in the Tardis [+]unclear authorship, The Dr Who Annual 1968 (World Distributors, 1967). Page 21.)
The speed at which thought travelled, the speed of thought, equalled the speed of light. (PROSE: The Sands of Time)
Historians who had been allowed access to the "Monster Vaults" of the databanks in the Doctor's TARDIS observed that Abzorbaloffs sought the thoughts and experiences of other lifeforms as their own thoughts and experiences were "profoundly dreary". (PROSE: The Monster Vault) Upon being absorbed by "Victor Kennedy, Ursula Blake found that she could read his thoughts, learning that he intended to absorb Elton Pope after her. (TV: Love & Monsters)
The Eleventh Doctor's sonic screwdriver was controlled by his thoughts. (PROSE: Super Sonic)
When Shirley Bingham asked the Fourteenth Doctor how the Toymaker accomplished his seemingly physically impossible feats, he asked if she would believe him if he told her that he manipulated atoms with the power of thought. She asked if this was, in fact, what he did, and he admitted that it was not, telling her there was nothing she could do to fight him. (TV: The Giggle)