Gastric slow-wave pacemaker (~3 cpm)

The gastric pacemaker is a robust limit cycle on the shared FitzHugh–Nagumo oscillator: at a long recovery constant τ_s=380 it beats at the cited ~3 cpm anchor, with inter-spike-interval variability under 3% across a wide drive sweep (0.40–0.70). The rhythm mechanism is forced [V]; the absolute 3 cpm rate is a cited anchor [L].

The gastric slow wave is a structurally stable limit cycle: a long FitzHugh–Nagumo recovery constant τ_s=380 yields ~3 cpm, with ISI CV < 3% across drive 0.40–0.70. One gastric-anchored clock K_TIME=2400 cpm/model-Hz sets the rate; the rhythm is [V], the 3 cpm value is [L].

The gastric pacemaker is a robust limit cycle on the shared FitzHugh–Nagumo oscillator, beating at the cited ~3 cpm gastric anchor. Because the slow recovery variable sets the period, a long recovery constant τ_s = 380 places the rhythm far below the switch timescale, exactly as the neuroscience volume's low-frequency result requires.

Across a wide tonic-drive sweep (0.40–0.70) the inter-spike-interval coefficient of variation stays under 3%, so the beat is a structurally stable limit cycle rather than a tuned resonance. The single gastric-anchored clock K_TIME = 2400.0 cpm/model-Hz converts the model frequency to 3.0 cpm, matching the anchor.

The rhythm mechanism is forced [V]; the absolute 3 cpm rate is a cited physiological anchor [L], not an emergent quantity. The interstitial cells of Cajal are modelled as the slow-wave pacemaker substrate, and their rate sets the clock that every aboral segment inherits.