Internal stochastic resonance in the coherence between spinal and cortical neuronal ensembles in the cat.
Neurosci Lett
; 326(2): 93-6, 2002 Jun 28.
Article
en En
| MEDLINE
| ID: mdl-12057836
Internal stochastic resonance is a phenomenon in which the coherence of a non-linear system is enhanced by the presence of a particular, non-zero level of noise generated by internal or external sources without a periodic input signal. The aim of this study was to demonstrate the experimental occurrence of internal stochastic resonance in the coherence between spinal and cortical neuronal ensembles. Simultaneous recordings of spinal and cortical evoked potentials were made in the somatosensory system of the anaesthetized cat. Evoked potentials were produced by input noise introduced in the tactile stimulation of the hindpaw skin. Coherence between the spinal and cortical evoked activity recorded during different levels of input noise was calculated. All animals showed distinct internal stochastic resonance like behavior. We found that the mean coherence was an inverted U-like function of the level of input noise with a mean coherence peak of 0.43. To our knowledge, this is the first documented evidence of such phenomenon in an in vivo preparation of the central nervous system.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Corteza Somatosensorial
/
Médula Espinal
/
Neuronas
Límite:
Animals
Idioma:
En
Revista:
Neurosci Lett
Año:
2002
Tipo del documento:
Article
País de afiliación:
México
Pais de publicación:
Irlanda