Neuronal circuits refer to the interconnected networks of neurons in the brain that work together to process and transmit information. These circuits play a crucial role in various brain functions such as perception, memory, cognition, and behavior. Researchers study neuronal circuits to understand how information is processed and integrated within the brain, and how disruptions in these circuits can lead to neurological disorders and diseases. By mapping and studying these circuits, researchers can gain insight into the underlying mechanisms of brain function and potentially develop new treatments for neurological disorders.