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- Roberto F Galán, G Bard Ermentrout, Nathaniel N Urban
- Physical review letters
- 2005

The phase-resetting curve (PRC) of a neural oscillator describes the effect of a perturbation on its periodic motion and is therefore useful to study how the neuron responds to stimuli and whether it phase locks to other neurons in a network. Combining theory, computer simulations and electrophysiological experiments we present a simple method for… (More)

- G Bard Ermentrout, Roberto F Galán, Nathaniel N Urban
- Physical review letters
- 2007

We demonstrate that two key theoretical objects used widely in computational neuroscience, the phase-resetting curve (PRC) from dynamics and the spike triggered average (STA) from statistical analysis, are closely related when neurons fire in a nearly regular manner and the stimulus is sufficiently small. We prove that the STA due to injected noisy current… (More)

- Roberto F. Galán
- PloS one
- 2008

In the absence of sensory stimulation, neocortical circuits display complex patterns of neural activity. These patterns are thought to reflect relevant properties of the network, including anatomical features like its modularity. It is also assumed that the synaptic connections of the network constrain the repertoire of emergent, spontaneous patterns.… (More)

- Roberto F Galán, Nicolas Fourcaud-Trocmé, G Bard Ermentrout, Nathaniel N Urban
- The Journal of neuroscience : the official…
- 2006

Oscillations are a common feature of odor-evoked and spontaneous activity in the olfactory system in vivo and in vitro and are thought to play an important role in information processing and memory in a variety of brain areas. Theoretical and experimental studies have described several mechanisms by which oscillations can be generated and synchronized.… (More)

- G Bard Ermentrout, Roberto F Galán, Nathaniel N Urban
- Trends in neurosciences
- 2008

The brain is noisy. Neurons receive tens of thousands of highly fluctuating inputs and generate spike trains that appear highly irregular. Much of this activity is spontaneous - uncoupled to overt stimuli or motor outputs - leading to questions about the functional impact of this noise. Although noise is most often thought of as disrupting patterned… (More)

- Roberto F Galán, G Bard Ermentrout, Nathaniel N Urban
- Physical review. E, Statistical, nonlinear, and…
- 2007

We have investigated the effect of the phase response curve on the dynamics of oscillators driven by noise in two limit cases that are especially relevant for neuroscience. Using the finite element method to solve the Fokker-Planck equation we have studied (i) the impact of noise on the regularity of the oscillations quantified as the coefficient of… (More)

- Roberto F Galán, G Bard Ermentrout, Nathaniel N Urban
- Journal of neurophysiology
- 2008

Use of spike timing to encode information requires that neurons respond with high temporal precision and with high reliability. Fast fluctuating stimuli are known to result in highly reproducible spike times across trials, whereas constant stimuli result in variable spike times. Here, we first studied mathematically how spike-time reliability depends on the… (More)

- Jose Luis Perez Velazquez, Luis Garcia Dominguez, Stewart Lo, Roberto Fernández Galán, Ramon Guevara Erra
- BMC Neuroscience
- 2007

Coordinated cellular activity is a major characteristic of nervous system function. Coupled oscillator theory offers unique avenues to address cellular coordination phenomena. In this study, we focus on the characterization of the dynamics of epileptiform activity, based on some seizures that manifest themselves with very periodic rhythmic activity, termed… (More)

We present an efficient approach to discriminate between typical and atypical brains from macroscopic neural dynamics recorded as magnetoencephalograms (MEG). Our approach is based on the fact that spontaneous brain activity can be accurately described with stochastic dynamics, as a multivariate Ornstein-Uhlenbeck process (mOUP). By fitting the data to a… (More)

- Arun R. Antony, Andreas V. Alexopoulos, +5 authors Roberto F. Galán
- PloS one
- 2013

This project aimed to determine if a correlation-based measure of functional connectivity can identify epileptogenic zones from intracranial EEG signals, as well as to investigate the prognostic significance of such a measure on seizure outcome following temporal lobe lobectomy. To this end, we retrospectively analyzed 23 adult patients with intractable… (More)