The mind was the consciousness of a sentient being. The term was sometimes used interchangeably with brain.

According to the First Doctor, "the mind was indestructible". (PROSE: The Celestial Toymaker)

Historians who had been allowed access to the "Monster Vaults" of the databanks in the Doctor's TARDIS observed that Abzorbaloffs absorbed the minds of their victims as it assimilated their brains into its flesh. Whilst being absorbed, a victim would become mentally linked with their host, allowing them to read their minds and thoughts. (PROSE: The Monster Vault, TV: Love & Monsters)

The Teller could detect guilt in people's minds. (TV: Time Heist)

After the Twelfth Doctor's mind was connected to a mind scythe, he showed Kygon Brox some "holiday snaps" from his memories. (COMIC: The Instruments of War)

Torchwood Three had a mind probe. They used it to scan Beth Halloran's mind, trying to discover whether she had attacked the burglars who broke into her house. (TV: Sleeper)

The TARDIS, as a metaphysical engine, was capable of entering the dimension of a person's mind, their imagination. (PROSE: Every Day)

After the defeat of the Slitheen family on 7 March 2006, Mickey Smith (TV: World War Three ^[+]Russell T Davies, Doctor Who series 1 (BBC One, 2005).) wrote on his website the morning after, confessing that he had "been in two minds" recently, finding himself doubting the evidence, facts, and secrets he uncovered, although he was reassured by the emails he received, even though he sometimes deleted them, knowing vaguely what was in them. (PROSE: Hoax This! ^[+]BBC webteam, Who is Doctor Who? (BBC, 2005).)

When the endgame was reached in the game of four dimensional chess played between the Mandarin and the Entity, the Mandarin realised he was losing; a new concept entered his mind — a stalemate — a preferable option to the high-stake loss. (PROSE: Games ^[+]Warwick Gray, Brief Encounters (Marvel Comics UK, 1992). Page 22.)