Final answer:
Neuronal circuits are groups of interconnected neurons that work together to transmit and process information in the brain, including reverberating oscillating circuits which sustain signals over extended periods of time.
Step-by-step explanation:
Neuronal circuits are groups of interconnected neurons that work together to transmit and process information in the brain. One type of neuronal circuit is the reverberating oscillating circuit, which is characterized by a continuous feedback loop that produces a recurrent pattern of activity. These circuits are practical because they can sustain signals over extended periods of time, allowing for functions like breathing and memory consolidation.