4.4 Article

Multichannel Extracellular Recording in Freely Moving Mice

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JOURNAL OF VISUALIZED EXPERIMENTS
DOI: 10.3791/65245

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This study provides a detailed procedure for electrode implantation and extracellular recording in free-moving mice, allowing the study of neural network activity during specific tasks. The multichannel recording technique enables the acquisition and comparison of a greater number of neurons and neuronal subtypes, facilitating the evaluation of the relationship between specific behavior and associated electrophysiological signals.
The protocol aims to uncover the properties of neuronal firing and network local field potentials (LFPs) in behaving mice carrying out specific tasks by correlating the electrophysiological signals with spontaneous and/or specific behavior. This technique represents a valuable tool in studying the neuronal network activity underlying these behaviors. The article provides a detailed and complete procedure for electrode implantation and consequent extracellular recording in free-moving conscious mice. The study includes a detailed method for implanting the microelectrode arrays, capturing the LFP and neuronal spiking signals in the motor cortex (MC) using a multichannel system, and the subsequent offline data analysis. The advantage of multichannel recording in conscious animals is that a greater number of spiking neurons and neuronal subtypes can be obtained and compared, which allows the evaluation of the relationship between a specific behavior and the associated electrophysiological signals. Notably, the multichannel extracellular recording technique and the data analysis procedure described in the present study can be applied to other brain areas when conducting experiments in behaving mice.

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