Fig. 2

Fictive eupnea and sighs. The model in [9] generates both fictive eupnea (lower amplitude, higher frequency) and fictive sighs (lower frequency, higher amplitude). (A) Voltage trace (\(V_{e}\)) for the eupnea compartment with unidirectional input from the sigh compartment. (B) Voltage trace for the isolated sigh compartment, as specified in Eqs. (3a)–(3e) and (4a)–(4j); here we use \(V_{s}\) in place of V to contrast with the voltage \(V_{e}\) in (A). Note the difference in timescales between the two panels