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- Mark J Hunt, Monika Falinska, Szymon Łeski, Daniel K Wójcik, Stefan Kasicki
- Journal of psychopharmacology
- 2011

Previously, we showed that NMDA antagonists enhance high-frequency oscillations (130-180 Hz) in the nucleus accumbens. However, whether NMDA antagonists can enhance high-frequency oscillations in other brain regions remains unclear. Here, we used monopolar, bipolar and inverse current source density techniques to examine oscillatory activity in the… (More)

- Torbjørn V. Ness, Chaitanya Chintaluri, +4 authors Gaute T. Einevoll
- Neuroinformatics
- 2015

Microelectrode arrays (MEAs), substrate-integrated planar arrays of up to thousands of closely spaced metal electrode contacts, have long been used to record neuronal activity in in vitro brain slices with high spatial and temporal resolution. However, the analysis of the MEA potentials has generally been mainly qualitative. Here we use a biophysical… (More)

- Ewelina Knapska, Victoria Lioudyno, +10 authors Leszek Kaczmarek
- The Journal of neuroscience : the official…
- 2013

Learning how to avoid danger and pursue reward depends on negative emotions motivating aversive learning and positive emotions motivating appetitive learning. The amygdala is a key component of the brain emotional system; however, an understanding of how various emotions are differentially processed in the amygdala has yet to be achieved. We report that… (More)

- Szymon Leski, Klas H. Pettersen, Beth Tunstall, Gaute T. Einevoll, John Gigg, Daniel K. Wójcik
- Neuroinformatics
- 2011

The recent development of large multielectrode recording arrays has made it affordable for an increasing number of laboratories to record from multiple brain regions simultaneously. The development of analytical tools for array data, however, lags behind these technological advances in hardware. In this paper, we present a method based on forward modeling… (More)

- Jan Potworowski, Wit Jakuczun, Szymon Leski, Daniel K. Wójcik
- BMC Neuroscience
- 2011

Local field potentials (LFP), the low-frequency part of extracellular electrical recordings, are a measure of the neural activity reflecting dendritic processing of synaptic inputs to neuronal populations. To localize synaptic dynamics, it is convenient, whenever possible, to estimate the density of transmembrane current sources (CSD) generating the LFP. In… (More)

- Szymon Leski, Ewa Kublik, Daniel A. Swiejkowski, Andrzej Wróbel, Daniel K. Wójcik
- Journal of Computational Neuroscience
- 2009

Local field potentials have good temporal resolution but are blurred due to the slow spatial decay of the electric field. For simultaneous recordings on regular grids one can reconstruct efficiently the current sources (CSD) using the inverse Current Source Density method (iCSD). It is possible to decompose the resultant spatiotemporal information about the… (More)

- Szymon Leski, Daniel K. Wójcik, Joanna Tereszczuk, Daniel A. Swiejkowski, Ewa Kublik, Andrzej Wróbel
- Neuroinformatics
- 2007

Estimation of the continuous current-source density in bulk tissue from a finite set of electrode measurements is a daunting task. Here we present a methodology which allows such a reconstruction by generalizing the one-dimensional inverse CSD method. The idea is to assume a particular plausible form of CSD within a class described by a number of parameters… (More)

- Jan Potworowski, Helena Głąbska, Szymon Łęski, Daniel K Wójcik
- BMC Neuroscience
- 2011

The low-frequency part of the extracellular electric signals, the local field potentials (LFP), carries information about dendritic processing in neuronal populations. However, the long-range nature of electric field makes the analysis of LFP difficult, as typically an electrode records activity of many sources. Modern multielectrodes allow for increased… (More)

- Daniel K. Wójcik, Szymon Leski
- Neural Computation
- 2010

We propose two ways of estimating current source density (CSD) from measurements of voltage on a Cartesian grid with missing recording points using the inverse CSD method. The simplest approach is to substitute local averages (LA) in place of missing data. A more elaborate alternative is to estimate a smaller number of CSD parameters than the actual number… (More)

- Daniel K Wójcik, J R Dorfman
- Physical review. E, Statistical, nonlinear, and…
- 2002

We introduce a family of models for quantum mechanical, one-dimensional random walks, called quantum multibaker maps (QMB). These are Weyl quantizations of the classical multibaker models previously considered by Gaspard, Tasaki, and others. Depending on the properties of the phase's parametrizing the quantization, we consider only two classes of the QMB… (More)