Abstract
Recently, we demonstrated that our micro-endoscopic system enabled acquiring optical image in submillisecond temporal resolution (132 μs/line) by line-scan. The micro-endoscope was fabricated from optical fiber bundle as an endoscope tip and the bundle was coated by gold and enamel. The tip was beveled as cone-shape for minimal invasion and the surrounding edge became electrical-conductive for being used as an electrode. Then, this system can record electrical activities (local field potentials; LFP, and multi-unit activities; MUA) at a sampling rate of 20 kHz and optical responses (calcium response derived from Oregon green BAPTA-1, AM; ΔF/F) simultaneously. We recorded these responses from the inferior colliculus (IC) of two species of bats (Carollia perspicillata and Eptesicus fuscus) to tone bursts (10, 20, 40, 60, and 80 kHz), noise bursts (5-100 kHz), and downward FM sweeps (80-20 and 100-30 kHz). Along the same scanning line, several activated areas (hot spots) were found responding to a single sou...
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