Resonance phenomena is present and have been studied in a large variety
of systems going from physical, chemical to biophysical systems. In this
talk I will present two resonance phenomena. The first one occurs in
the motor system, in particular, in motoneurons related to the
monosynaptic reflexes elicited by periodic electrical stimulation in
presence of mechanical noise. Our experimental and numerical results
provide the first direct demostration that the motor system, and not
only the sensory system, exhibit the stochastic resonance phenomenon.
The second resonance behavior is related to the presence of diversity in
an ensamble of excitable units. We study the effect of diversity in a
system of neurons whose dynamical behaviour is described by the
Morris-Lecar model. When such system is subjected to an external
subthreshold signal, we observe that their response is optimized for an
intermediate value of the diversity. We also observe a resonant response
of the system to a certain period of the external signal. These results
show that intrinsic diversity might have a constructive role and suggest
that natural systems might profit from their diversity in order to
optimize the response to an external stimulus.
Coffee and cookies will be served 15 minutes before the start of the seminar
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