Micro-endoscopic system for functional assessment of neural circuits in deep brain regions: Simultaneous optical and electrical recordings of auditory responses in mouse’s inferior colliculus

•We developed a micro-endoscope for simultaneous optical and electrical recordings.•This system enables us to observe neuronal activities from deep brain regions.•This system enables us to compare electrical recording and optical response. In vivo Ca2+ imaging is a powerful method for the functional...

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