Multielectrode microarrays are devices that contain multiple electrodes through which neural signals are obtained, essentially serving as a neural interface that connects neurons to an electrical circuitry. In order to accomplish this, we use electrode wire as a necessary electrical conductor that allows us to make contact and measure electrical signal with nonmetalic objects such as neurons.
From these recordings, we are able to collect two types of data: unit recordings and LFP. Unit recordings consist of recording a single neuron and the individual action potentials which that specific neuron fires. When you take the summed electrical output of multiple of these neurons in a small volume of brian tissue, this is the LFP or local field potential. This is very useful to us as we can identify certain physiological markers based on known LFP trends that predominate through cortical structures like the hippocampus
Link to Micro array building guide.
https://docs.google.com/document/d/1fjvAEcLsTcrwGpnetyqOyrxZ6BpGN6QBV5Zqvhy2T84/edit