Neural pathway

From Tardis Wiki, the free Doctor Who reference

Neural pathways were passages in an individual's brain which carried information.

In Sepulchre's mind, where historical re-enactments of London from different eras were sustained, neural pathways appeared as rivers. Rowing along these pathways allowed the Eighth Doctor, Lucie Miller and Sophie Shephard to travel through Sepulchre's psyche. (AUDIO: Dead London)