You see, the Cognitive Neuroscience Lab at Northwestern University has recently delved into a research vein similar to Huxley's idea. In a very easy-to-understand paper, members of my lab tested whether sounds played at night can actually help with memory the next day.
The paradigm went like this- participants learned where 50 objects were located on the screen and each object was paired with a matching unique sound. So they would learn the tea kettle is in the upper right corner and that a kettle whistle is associated with that picture. Next, participants took a nap and during the deep sleep stage, half of the sounds they heard were replayed to them (without waking them up). When they woke up, they were tested on how well they could remember where the objects belonged. Results showed that participants remembered more of the objects that were cued while they were asleep, and were better at closely matching where those images went on the screen. Basically, it seems like playing the sounds reactivated the memory traces during sleep and helped consolidate them to make a stronger memory!
And this research doesn't just extend to visuospatial learning. Another member of my lab showed that participants can better learn to play a keyboard to produce a melody that's been cued during sleep rather than one that hasn't. So it appears this memory reactivation is multimodal, even when we sleep.
I cannot tell you how fascinating I find this research. Currently, I'm working on a project regarding implicit memory but I'm dying to get my toes wet in some sleep-memory research. I just haven't found the right research question yet.
Let me know if these projects bring any questions/ponderings to mind!
