 Each type of rhythm is generated by the same neurons in the pre-Bötzinger complex, but through different mechanisms, receptors, and ion currents that are controlled by changes in the behavior or environment of the organism.Under low levels of oxygen, the pre-Bötzinger complex needs to rearrange the activity of its neurons and requires the assistance of other brain structures, like the pons, to generate gasping.Gasping is characterized by a rhythm that has faster rise, shorter bursts, and lower frequency.