title: Topologically inequivalent orbits induced by noise.
abstract: In this Letter we extend the concept of stochastic resonance. We show that in forced excitable systems noise can be responsible for the appearance of recurrences presenting a robust topological organization inequivalent to the periodic orbits of the deterministic system. As in stochastic resonance, these new structures are most pronounced at an optimal noise intensity.
authors.affiliation: Departamento de Física, FCEN, UBA, Ciudad Universitaria, Pabellón I (1428), Buenos Aires, Argentina.
authors.forename: Jorge M
authors.initials: JM
authors.lastname: Mendez
authors.forename: J
authors.initials: J
authors.lastname: Aliaga
authors.forename: G B
authors.initials: GB
authors.lastname: Mindlin
mesh_terms: D008962:Models, Theoretical; D009474:Neurons / Q000502:physiology; D010507:Periodicity; D013269:Stochastic Processes