نتایج جستجو برای: evoked response variability
تعداد نتایج: 1164419 فیلتر نتایج به سال:
INTRODUCTION Evoked responses in functional studies show baseline dependence [1], i.e. in higher metabolic baseline state the functional response is smaller but delocalized, whereas lower metabolic baseline shows higher amplitude localized responses. Other human studies [2] showed that spontaneous fluctuations in BOLD signal seem to be important in local variability or trial-to-trial reproducib...
BACKGROUND Many brain imaging techniques interpret the haemodynamic response as an indirect indicator of underlying neural activity. However, a challenge when interpreting this blood based signal is how changes in brain state may affect both baseline and stimulus evoked haemodynamics. NEW METHOD We developed an Automatic Brain State Classifier (ABSC), validated on data from anaesthetised rode...
A signature feature of cortical spike trains is their trial-to-trial variability. This variability is large in the spontaneous state and is reduced when cortex is driven by a stimulus or task. Models of recurrent cortical networks with unstructured, yet balanced, excitation and inhibition generate variability consistent with evoked conditions. However, these models produce spike trains which la...
The state of the brain and body constantly varies on rapid and slow timescales. These variations contribute to the apparent noisiness of sensory responses at both the neural and the behavioral level. Recent investigations of rapid state changes in awake, behaving animals have provided insight into the mechanisms by which optimal sensory encoding and behavioral performance are achieved. Fluctuat...
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