Showing papers in "Clinical Neurophysiology in 1999"

TL;DR: Quantification of ERD/ERS in time and space is demonstrated on data from a number of movement experiments, whereby either the same or different locations on the scalp can display ERD and ERS simultaneously.

TL;DR: The effectiveness of the devised spatial filters for multi-channel EEG that lead to signals which discriminate optimally between two conditions is demonstrated, and the method's procedural and computational simplicity make it a particularly promising method for an EEG-based brain-computer interface.

TL;DR: It is suggested that target/standard discrimination difficulty, rather than stimulus novelty, determines P3a generation for both auditory and visual stimulus modalities.

TL;DR: The rotating stimulus elicited higher gamma band power as compared to the standing stimulus at electrode locations, which may be related to the activity of underlying cortical structures specialized for motion processing.

TL;DR: The sleeping brain, during SII and PS, elicits a differential cognitive response to the presentation of the subject's own name, comparable to that occurring during wakefulness, and therefore that the sleeping brain is able to detect and categorize some particular aspects of stimulus significance.

TL;DR: Each EEG coherence method has its own potential sources of error and provides coherence estimates for different neural population sizes located in different locations, so studies of coherence and brain state should include several different kinds of estimates to take full advantage of information in recorded signals.

TL;DR: Emotional processing enhanced gamma band power at right frontal electrodes regardless of the particular valence as compared to processing neutral pictures, suggesting that the extended distribution of specific activity in the gamma band may be the signature of cell assemblies with members in limbic, temporal and frontal neocortical structures that differ in spatial distribution depending on the particular type of emotional processing.

TL;DR: Both air- and bone-conducted sounds have to be taken into account in the design and interpretation of TMS experiments and the acoustical click from the TMS coil evoked large auditory potentials, whose amplitude depended critically on the mechanical contact of the coil with the head.

TL;DR: The greater the coverage of the surface of the volume conductor, the more the average reference approaches the ideal inactive reference, and this polar average reference effect (PARE) is illustrated.

TL;DR: Experimental evidence for the existence of the two types of alpha rhythm and the bifurcation predicted by the model is found, apparently, during these epochs the activity of the brain has such a high complexity that it cannot be distinguished from a random process.

TL;DR: The findings suggest that the gamma responses are not solely associated with the binding of stimulus features, but reflect some processes related to target processing, and the phase-locking of these two responses could be synchronized due to the monitor flicker frequency.

TL;DR: It is demonstrated that the recording of MMN and the auditory N100 can be a very useful aid in the assessment of coma and in predicting whether or not a patient will regain consciousness.

TL;DR: This study suggests that the underlying neural basis associated with processing faces matures in a gradual, quantitative manner throughout childhood.

TL;DR: It is concluded that the current source density or its approximation is preferable to estimate the cortico-muscular coherence and that the interpretation of such coherence using referenced EEGs should be taken with care.

TL;DR: These manual RT/P300 findings support the view that Stroop interference and facilitation originate from response competition between the relevant and irrelevant stimulus attributes.

TL;DR: It is speculated that the development of sensorimotor mu rhythm is influenced by somatosensory stimulation, which, in sharp contrast to the visual input, is present in the uterus.

TL;DR: The hypothesis that cortical brain structures responsible for execution and imagination of memorized saccadic eye movements are similar is supported.

TL;DR: The aim of this study was to identify the hand knob using fMRI and to reveal if the anatomical hand knob corresponds to the hand area of the motor cortex, as identified by TMS, by means of a frameless MRI-based neuronavigation system.

TL;DR: It is suggested that activation of SII area contralateral to stimulation, possibly through direct thalamocortical projections, represents the first step in the cortical processing of peripheral A delta fiber pain inputs.

TL;DR: Steady-state auditory evoked fields recorded using a whole head MEG system indicate that the primary activity of the auditory cortex remains constant up to high stimulation rates and is not specifically enhanced around 40 Hz.

TL;DR: This study strongly suggests that the VPP reflects an early visual stage of face processing in the fusiform gyrus that is strictly stimulus-related and independent of familiarity, and shows that source localization algorithms may give reliable solutions on single subject averages for early visual components despite high inter-subject variability of the surface characteristics of ERPs.

TL;DR: The long-term intra- individual variability for most parameters, especially for total absolute power and alpha mean frequency, was less than the inter-individual variability in the normal population.

TL;DR: EMG measurement is best suited for clinical applications if submaximal MVC measurements are performed and signal is taken from rectus femoris muscle, and 50% MVC EMG recordings demonstrated better reproducibility than 100% M VC measurements.

TL;DR: Spectral EEG analysis may improve the assessment of mild hepatic encephalopathy by decreasing inter-operator variability and providing reliable parameters correlated with mental status.

TL;DR: Synchronized gamma-range activity in human Sensorimotor cortex increases with performance of manipulative visuomotor tasks, supporting the hypothesis that coherent gamma oscillations may play a role in sensorimotor integration or attention.

TL;DR: Reliabilities of the mismatch negativity elicited by deviances in sound duration, frequency, and intensity significantly exceed those reported previously and support the use of the duration decrement deviance presented with spectrally rich tones while investigating the integrity of the patients' cognitive brain functions using the MMN.

TL;DR: The results of this study suggest that processes of generation of both types of sleep spindles are weakly coupled.

TL;DR: SSG is superior to commercial voice synthesizers because it yields speech stimuli of a highly natural quality due to the contribution of the man-originating glottal excitation, making SSG suitable for cognitive experiments using speech sounds as stimuli.

TL;DR: Vibratory S-SEPs may originate from the primary somatosensory cortex and provide information on the fast-adapting mechanoreceptive afferents and the temporal resonance at 21 Hz places the somatoensory system between the visual and auditory systems.

TL;DR: Findings in autistic children showing very disturbed verbal communication argue for dysfunction in brain areas involved in N1c generation i.e., the auditory associative cortex in the lateral part of the superior temporal gyrus, with more specific left side defects when auditory stimulus have to be processed.