From Wernicke's area, information travels to Broca's area, then to the Primary Motor Cortex. In split brain patients, information received from the right and from the left hemiworlds cannot be integrated, and there is a striking internal struggle if the dual information seem ambiguous. This can be studied by presenting opposite information in the two sides of a screen and asking the subject to interpret the information. Most of the periodic behaviors of our body are controlled directly by the nervous system. Among the most noticeable examples are heartbeat and respiration.
Single neurons do have some peculiar characteristics that can themselves give rise to periodicity.
So, a steady input in a nerve cell can, under the right circumstances, result in a single-neuron oscillation. It is generally believed that most of the periodic behaviors in animals are generated and controlled by pace-making circuits rather than cells. Circuits can be controlled better and are more robust than single neurons. Sleep follows a regular cycle each night - the EEG pattern changes in a predictable way several times during a single period of sleep. This figure illustrates a EEG signature of the four phases of sleep in humans.