The Time Lords often used time distortions to project thoughts into other individuals across time. This was used once on Schmidt while the the Doctor was trapped on a German U-Boat. Commander Vansell used Schmidt to try and kill the Doctor. (AUDIO: The Sirens of Time)
Cyber-Technology could detect the Doctor's TARDIS by registering the time distortion it created. (TV: Attack of the Cybermen) The Sixth Doctor had a tracking device for time distortions, which he was able to track the Rani with. (TV: The Mark of the Rani)
Behind the scenes Edit
Time distortions in the Time Vortex act as obstacles in the first and last levels of the online game Doctor In A Dash where, as with all levels, the Doctor's TARDIS (the player) races against a Dalek flying saucer, a Judoon rocket, and a Slitheen craft to find a Space-Time Manipulator.