If you’ve been to a summer house party within the last two years, there’s a high chance you’ve probably heard a Girl Talk track at some point — infectious multi-snippetted jams that blend and recontextualize samples into an almost elevated form of the mash-up. Jonah Lehrer breaks down Girl Talk’s work from a neurological perspective, proposing that the mash-up song is an apt metaphor for the production of new ideas in working memory.
Let’s say you’re listening to that catchy Wu-Tang song, with the chorus “And let’s start it like this, son, rollin’ with this one / And that one, pullin’ out gats for fun”. Once the acoustic snippet enters working memory, individual neurons in the prefrontal cortex will fire in response to the stimulus – they are the neural representation of the song. Here’s where things get interesting: even when the stimulus disappears – you’ve now started listening to a different song, perhaps that Boston song “Foreplay/Long Time” – those working memory cells continue to fire. They’re still holding on to the Wu-Tang clip, which is why working memory is a type of memory. This echo of activity only lasts for a few seconds, but it’s long enough so that our thoughts get blended together, as seemingly unrelated sensations overlap. (Scientists refer to this as RAM-like activity, since these brain cells are acting just like random access memory in a computer, which is rewritable temporary storage that allows multitasking.) The end result is that prefrontal neurons start to form connections that have never existed before. We can imagine how Wu-Tang and Boston might sound as a mash-up, if only because working memory allows the samples to intersect in the frontal cortex. From the perspective of the brain, such new ideas are merely old thoughts that occur at the exact same time.
[TDD]
