sentences:  Prochaska described the "sensorium commune" as the core mechanism of the reflex.It involved the spinal cord, medulla oblongata and the basal ganglia, and had the ability to reflect sensory impressions into the motor nervous system by definite laws unique to itself, and also independent of consciousness.Prochaska demonstrated that reflex worked without a brain, but could not work without a spinal cord, and summarized that voluntary behavior was a brain function, while reflex was spinal-based.