Fiber photometry is a neuroscientific technique used to measure neural activity in freely behaving animals. It involves implanting an optical fiber into a specific brain region to deliver excitation light and collect fluorescence signals emitted by genetically encoded calcium indicators (GECIs) expressed by neurons. Changes in fluorescence intensity correlate with neuronal activity, providing a measure of population-level neural dynamics. It is commonly used to study neural circuits involved in behavior, learning, and neurological disorders.
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