I’ll be continually updating this page as I get more recordings.
Often neurophysiologists who work with freely behaving rats have to attend to the rat and can not always keep their eyes on their oscilloscopes. Instead, many neurophysiologists rely on sound to listen for brain activity. Neural signals are often amplified then sent to speakers for the experimenter to listen to. These sounds can be very informative for what is going on in the brain. Are my electrodes getting close to a layer of cells? How many cells are on a given electrode? What are these cells responding to? Are these cells rhythmically modulated? Answers to all these questions and more can be gleaned from listening to the brain. Below you can find examples of different brain sounds. Mainly they are of cellular activity of neurons. Each “pop” is a neuron firing an action potential; the electrical signal that allows neuron to communicate with each other and the rest of the body. There are also recordings of brain oscillations; that is the gross electrical activity which results from the processing done by thousands of neurons.