masterThesis
Medida de uma codificação de estímulos sonoros por potenciais pós-sinápticos e potenciais de campo local usando teoria da informação
Fecha
2014-07-03Registro en:
ASSIS, Juliana Martins de. Medida de uma codificação de estímulos sonoros por potenciais pós-sinápticos e potenciais de campo local usando teoria da informação. 2014. 102f. Dissertação (Mestrado em Neurociências) - Universidade Federal do Rio Grande do Norte, Natal, 2014.
Autor
Assis, Juliana Martins de
Resumen
Coding process is a fundamental aspect of cerebral functioning. The sensory stimuli
transformation in neurophysiological responses has been a research theme in several areas
of Neuroscience. One of the most used ways to measure a neural code e ciency is by
the use of Information Theory measures, such as mutual information. Using these tools,
recent studies show that in the auditory cortex both local eld potentials (LFPs) and
action potential spiking times code information about sound stimuli. However, there
are no studies applying Information Theory tools to investigate the e ciency of codes
that use postsynaptics potentials (PSPs), alone and associated with LFP analysis. These
signals are related in the sense that LFPs are partly created by joint action of several
PSPs. The present dissertation reports information measures between PSP and LFP
responses obtained in the primary auditory cortex of anaesthetized rats and auditory
stimuli of distinct frequencies. Our results show that PSP responses hold information
about sound stimuli in comparable levels and even greater than LFP responses. We have
also found that PSPs and LFPs code sound information independently, since the joint
analysis of these signals did neither show synergy nor redundancy.