Wyniki wyszukiwania - Biblioteka Nauki

1

Speech perception - toward understanding of consciousness

100%

Trąbka J. , Walecki P. , Lasoń W. , Pyrczak W. , Sarapata K.

Bio-Algorithms and Med-Systems

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2009

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tom Vol. 5, no. 10

45--49

EN

This paper presents a project executing within the framework of COST Action BM0605: Consciousness: A Trans-disciplinary, Integrated Approach. The research is centred on neurophysiological experiments to image brain function in diseases in which the phenomenon of consciousness plays an important role. The fundamental problem studied in this project will be an investigation of the relation between consciousness and speech perception. The study will be conducted using electroencephalographic methods on subjects with Auditory Processing Disorders.

2

Sensory processing related to vergence eye movements – an event-related potential study

100%

Przekoracka-Krawczyk A. , Wojtczak-Kwaśniewska M. , Przekoracka K. , Zeri F. , Naskręcki R.

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tom Vol. 48, nr 3

463--475

EN

Vergence eye movements, movements executed in opposite directions, have a crucial role in depth perception and are necessary for maintaining proper binocular vision. Despite these facts, the neurophysiological studies of vergence eye movement on humans are rare and give ambiguous results. In the present study, the sensory event-related potentials (ERPs) related to the processing of stimuli called for convergence, divergence and saccade were explored. Sixteen healthy subjects (mean 23 years old) performed reflexive (visually-guided) eye movements and event-related potentials from 64 active electrodes were recorded. The significant preponderance of cortical activity for convergence among three conditions was revealed and it concerned both anterior (larger negativity) and posterior cortex (larger positivity). Here, we also reported the longest latency for convergence. These results may suggest larger cortical representation for stimuli presented in near visual space, thus the preponderance of near cells within cortex, which respond to cross retinal image disparity being a cue for convergence.

3

An empirical survey of electroencephalographybased brain-computer interfaces

88%

Wankhade M. M. , Chorage S. S.

Bio-Algorithms and Med-Systems

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2020

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tom Vol. 16, no. 4

art. no. 20190053

EN

Objectives: The Electroencephalogram (EEG) signal is modified using the Motor Imagery (MI) and it is utilized for patients with high motor impairments. Hence, the direct relationship between the computer and brain is termed as an EEG-based brain-computer interface (BCI). The objective of this survey is to presents an analysis of the existing distinct BCIs based on EEG. Methods: This survey provides a detailed review of more than 60 research papers presenting the BCI-based EEG, like motor imagery-based techniques, spatial filtering-based techniques, Steady-State Visual Evoked Potential (SSVEP)- based techniques, machine learning-based techniques, Event-Related Potential (ERP)-based techniques, and online EEG-based techniques. Subsequently, the research gaps and issues of several EEG-based BCI systems are adopted to help the researchers for better future scope. Results: An elaborative analyses as well as discussion have been provided by concerning the parameters, like evaluation metrics, year of publication, accuracy, implementation tool, and utilized datasets obtained by various techniques. Conclusions: This survey paper exposes research topics on BCI-based EEG, which helps the researchers and scholars, who are interested in this domain.

4

Combined measurement of event-related potentials [ERPs] and fMRI

88%

Sommer M. , Meinhardt J. , Volz H. P.

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nr 1

5

The effect of tonic pain on processing the non-painful stimuli indexed by late components of event-related potentials

75%

Michalski A.

Acta Neurobiologiae Experimentalis

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1998

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tom 58

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nr 1

6

Event-related potentials - the P3 wave

75%

Hruby T. , Marsalek P.

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nr 1

7

Electrophysiological correlates of attentional processes in patients with liver cirrhosis without minimal or clinically-overt hepatic encephalopathy

63%

Ciecko-Michalska I. , Binder M. , Wyczesany M. , Szewczyk J. , Senderecka M. , Wojcik J. , Dziedzic T. , Slowik A. , Mach T.

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2012

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tom 63

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nr 4

8

Cognitive evoked response potentials in patients with liver cirrhosis without diagnosis of minimal or overt hepatic encephalopathy. A pilot study

63%

Ciecko-Michalska I. , Wojcik J. , Wyczesany M. , Binder M. , Szewczyk J. , Senderecka M. , Dziedzic T. , Slowik A. , Mach T.

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2012

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tom 63

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nr 3

9

Categorization of unilaterally presented emotional words: an ERP analysis

63%

Schapkin S. A. , Gusev A. N. , Kuhl J.

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tom 60

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nr 1

EN

This study is intended to clarify the functional role of different ERP components as indicators of the processing of emotions. The effect of emotional connotation of words on hemispheric lateralization is also explored. Visual ERPs were recorded to unilaterally presented positive, negative, and neutral words that should be categorized according to their emotional connotation. The P2 amplitude was larger to positive than to negative words whereas P3 amplitude was larger to positive words compared with neutral ones. The slow positive wave (SPW) was influenced by words emotionality at anterior and posterior sites differently. The amplitude of the N1 component was larger in the left hemisphere to contralateral^ presented words. The P2 and P3 components were larger over the left hemisphere whereas the N3 and N4 components were larger over the right hemisphere to ipsilateral stimulation. The results support our hypotheses on the functional role of positive ERP components in the processing of an affective words connotation: the P2 wave reflects a general evaluation of emotional significance, the P3 a task-related decision, and the SPW an additional decision control in the context of the emotional experience of an individual. Neither the "right hemisphere hypothesis" nor "valence hypothesis" on lateralization of the processing of emotions were confirmed. Each hemisphere seems to exert its effect on emotion through specific hemispheric resources that are unequally allocated along the different stages of task processing and may cause alternation of hemispheric dominance.

10

Altered electrophysiological pattern of target detection in schizophrenia in the Continuous Attention Test

63%

Basinska A.

Acta Neurobiologiae Experimentalis

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1998

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tom 58

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nr 3

11

EEG analysis with nonlinear deterministic and stochastic methods: a combined strategy

63%

Fell J. , Kaplan A. , Darkhovsky B. , Roschke J.

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tom 60

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nr 1

EN

We describe nonlinear deterministic versus stochastic methodology, their applications to EEG research and the neurophysiological background underlying both approaches. Nonlinear methods are based on the concept of attractors in phase space. This concept on the one hand incorporates the idea of an autonomous (stationary) system, on the other hand implicates the investigation of a long time evolution. It is an unresolved problem in nonlinear EEG research that nonlinear methods per se give no feedback about the stationarity aspect. Hence, we introduce a combined strategy utilizing both stochastic and nonlinear deterministic methods. We propose, in a first step to segment the EEG time series into piecewise quasi-stationary epochs by means of nonparametric change point analysis. Subsequently, nonlinear measures can be estimated with higher confidence for the segmented epochs fullfilling the stationarity condition.

12

Interactions between P300 and passive probe responses differ in different visual cortical areas

63%

Michalski A.

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nr 2

13

Sequential P3 effects in a Posner's spatial cueing paradigm: Trial-by-trial learning of the predictive value of the cue

51%

Gomez C. M. , Flores A. , Digiacomo M. R. , Vazquez-Marrufo M.

Acta Neurobiologiae Experimentalis

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2009

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tom 69

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nr 2

155-167

EN

The neurocognitive consequences of correct or incorrect spatial prediction in a sequential S1-S2 paradigm were assessed. Sequential dependence on previous trial outcome (valid or invalid) was assessed by late Event-Related Potentials (ERPs) and behavioural responses. Two different experiments were performed, situating the target in the vertical (Experiment 1) or in the horizontal (Experiment 2) meridian. RTs and late positivities (P3a and P3b) were recorded. ERPs showed that posterior positivity (probably a P3b) was greater in invalid-valid trials than in valid-valid trials but lower than in valid- invalid trials. However, at the frontal electrodes, late positivity (probably a P3a) only appeared in valid-invalid trials, indicating that invalid trials are analyzed as novel-like stimuli. The P3b results suggest trial-by-trial learning of the predictive value of the cue, which needs to be updated as indicated by the pattern of P3b amplitudes: valid-invalid > invalid-valid > valid-valid.

14

Development of the objective method for detection and analysis of disorders in the olfactory event-related potentials

51%

Kotas R. , Ciota Z.

International Journal of Microelectronics and Computer Science

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2015

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tom Vol. 6, nr 1

6--9

EN

This paper presents an objective method for early diagnosis of disorders and diseases of olfactory system. To achieve this goal the author designed a fragrance dosing prototype, which is synchronized with the dedicated recorder of olfactory evoked potentials. Automatic synchronization of registration of olfactory event-related potentials with dosing of stimulus fragrances enables precise determination of latency occurring between stimulation and response of the central nervous system. Obtained results allow to prove that developed prototype enables the evaluation of the olfactory system disorders in the context of neurodegenerative disorders. However it is necessary to establish a standardization procedures, before a wide implementation in a clinical practice. That is why the developed method requires a broader research which is an issue of a much larger group of patients and significantly longer duration of the study.