We consider a general model exhibiting type-I excitability mediated by a homoclinic and a saddle node on the invariant circle bifurcations. We show how the distinct properties of type-I with respect to type-II excitability confer unique features to traveling pulses in excitable media. They inherit the characteristic divergence of type-I excitable trajectories at threshold exhibiting analogous scalings in the spatial thickness of the pulses. Our results pave the way to identify basic underlying mechanisms behind type-I excitable pulses based solely on the characteristics of the pulse.

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• Bifurcations
• Chemical waves
• Ecological pattern formation
• Emergent biological functions from complex interactions
• Neuronal dynamics
• Pattern formation
• Population dynamics
• Coherent structures
• Reaction diffusion systems
• Solitons