Magdalena Zieleniewska

University of Warsaw | UW · Institute of Experimental Physics

The assessment of the level of consciousness in disorders of consciousness (DoC) is still one of the most challenging problems in contemporary medicine. Nevertheless, based on the multitude of studies conducted over the last 20 years on resting states based on electroencephalography (EEG) in DoC, it is possible to outline the brain activity profile...

Disorders of consciousness (DOC) are among the major challenges of contemporary medicine. Currently, clinical diagnosis of DOC is based upon behavioural scales like Coma Recovery Scale-Revised, which involves visual assessment of patient’s reactions. However, lack of communication with DOC patients, their potential sensory impairments, and fluctuat...

Disorders of consciousness (DOC) are among the major challenges of contemporary medicine, mostly due to the high rates of misdiagnoses in clinical assessment, based on behavioral scales. This turns our attention to potentially objective neuroimaging methods. Paradigms based on electroencephalography (EEG) are most suited for bedside applications, b...

Objective: Quantification of signatures of conscious processing in children with disorders of consciousness (DoC) using odd-ball paradigms in multiple modalities. Method: We review the diagnostic approaches available in the field, from clinical scales to neuroimaging methods, and concentrate upon measures derived from electroencephalographic event...

We propose a fully parametric approach to the assessment of sleep architecture, based upon the classical electroencephalographic criteria, applicable also to the recordings of patients with disorders of consciousness (DOC). Sleep spindles and slow waves are automatically detected from the matching pursuit decomposition of overnight EEG recordings....

There is growing evidence from human intracranial electrocorticography (ECoG) studies that interactions between cortical frequencies are important for sensory perception, cognition and inter-regional neuronal communication. Recent studies have focused mainly on the strength of phase-amplitude coupling in cross-frequency interactions. Here, we intro...

INTRODUCTION: Event-related (de-)synchronization (ER(D)S) is a short‑lasting modulation of specific frequency bands (e.g. alpha band) of EEG, which occurs in response for external stimuli (visual, haptic) or with motor imagery and execution of movements. Since it’s both time- and frequency‑specific, it is typically analysed in time‑frequency space,...

Objective Steady-state evoked potentials (SSEPs), the brain responses to repetitive stimulation are commonly used in both clinical practice and scientific research. Particular brain mechanisms underlying SSEPs in different modalities (i.e. visual, auditory and tactile) are very complex and still not completely understood. Each response has distinc...

Steady State Visual Evoked Potentials (SSVEP), observed in EEG over occipital areas of the scalp, are natural responses to flicker stimuli. This phenomenon is used in Brain-Computer Interfaces (BCI) and in psychology as an indicator of attention. Despite the fact that SSVEPs are used in these two fields of neuroscience, the knowledge of their funda...

Brain-computer interfaces based on SSVEP (steady-state visual evoked potentials) are traditionally built using professional-grade light emitting devices. Accurate, portable and customizable stimulator is desired for such application. The goal of this study is to increase the practicability, portability and ubiquity of an SSVEP-based BCI for daily u...

We present a complete framework for time-frequency parametrization of EEG transients, based upon matching pursuit (MP) decomposition, applied to the detection of sleep spindles. Ranges of spindles duration (>0.5 s) and frequency (11-16 Hz) are taken directly from their standard definitions. Minimal amplitude is computed from the distribution of the...

Common Spatial Pattern and statistical tests in social Simon experiment