Sub-conscious. Meaning you aren't actively thinking of something, but your brain is. Sort of like reading and listening to music at the same time. You might be concentrating on the words on the page, but your brain is listening and processing the words in the music.

[don't mind him if he starts stroking bits of his old TARDIS console when he gets there. he's missed it.]

Memory...is a tricky thing, Jamie. Sometimes, all it takes is for something simple like a particular smell, or a song to trigger something in the mind.

And other times, all it takes is for the central console of a certain time-travelling ship to appear in a park. [smiles]