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Activity of inspiratory neurons during apneas associated with periodic breathing. Traces are airflow, diaphragmatic electromyogram (EMGDIA) and raw action potentials of a neuron. Decrementing inspiratory (Idec) neuron without tonic activity during apnea (A). Augmenting inspiratory (Iaug) neuron with tonic activity during apneas associated with periodic breathing (B). Note there is no PIIA in the latter neuron during the waxing phase.
