Showing papers in "Electroencephalography and Clinical Neurophysiology in 1987"

TL;DR: The results indicate that CT scanning or other neuroimaging techniques which reveal detailed cerebral anatomy would be potentially highly useful in defining the generators of electrocerebral potentials recorded from the scalp.

TL;DR: The detailed patterns and levels of EMG activity demonstrate the different mechanical tasks of each muscle over the gait cycle, and some fundamental aspects of the neuromuscular control and the mechanical demands of walking are obvious.

TL;DR: It is suggested that different segment classes manifest different brain functional states exerting different effects on information processing, and the homogeneity of adaptive segment classes by their reduced within-class variance.

TL;DR: Surface splines are mathematical tools for interpolating functions of two variables that are smoother, give more precisely located extrema and converge faster toward the 'true' potential surface when the number of recording electrodes is increased.

TL;DR: Event-related brain potentials were recorded during an incidental learning paradigm and showed that the ERP differences based on later memory performance did not necessarily arise from amplitude variation in P3 waves that occurred at the same time.

TL;DR: It was concluded that EEG and EOG parameters closely reflect variations in sleepiness on the job and that these parameters, together with self-ratings, demonstrate that severe sleepiness may occur in train drivers during night work.

TL;DR: The findings suggest that P300 amplitude and latency obtained from auditory discrimination paradigms reflect processing difficulty independently of stimulus target probability unless differences in task requirements affect stimulus encoding.

TL;DR: Auditory evoked potentials elicited by standard (STs) and deviant tones (DTs) of different probabilities were studied in freely moving cats during wakefulness and sleep and a large double peaked negativity, so-called mismatch negativity, was evoked by the unattended low probability DTs.

TL;DR: Abnormalities in middle- and long-latency auditory evoked potentials do not necessarily reflect damage to primary auditory cortex per se, but rather the degree of damage to adjacent areas, and this area appears to exert a critical modulatory influence over N1 generators outside of the superior temporal plane.

TL;DR: Bit-mapped color imaging of scalp potential fields evoked by sensory stimulation in humans disclosed significant features not identified by mere inspection of multichannel traces, including a tangential equivalent dipole in parietal area 3b.

TL;DR: A cortical origin for the magnetic 40 Hz response is suggested, also suggesting that the electric 40 Hz AER is, at least in part, generated within the auditory cortex.

TL;DR: The simultaneous recording of P-ERGs and VEPs has demonstrated that aging is a major variable at the retinal level and the effects on the a and b waves are mostly due to optic changes with aging and only partially to aging changes in the neuronal retinal circuitry.

TL;DR: Each component of the early SEPs was thus distinctly influenced by the gating process during active movement interference, which could be in favour of separate cortical generators in the debate on the origin of SEP components.

TL;DR: The principal difference between the latencies of ERPs to auditory compared with somatosensory stimuli was that P3 was significantly longer for somatoensory stimulation, although differences in task difficulty may have influenced this finding.

TL;DR: The relationship between EEG and vigilance was studied in subjects performing tasks of differing complexity over a 15 h period by examining the structural changes of the EEG as vigilance deteriorates.

TL;DR: There was no effect of attention on the amplitude and phase of the steady-state evoked potentials when subjects either counted successive increments in stimulus intensity or read a book.

TL;DR: The results support the matching or comparison hypothesis of selective attention by showing that PN is not elicited only by the relevant stimuli but even by irrelevant stimuli, and further that the latter Pn is larger in amplitude and longer in duration the more similar the irrelevant stimuli are to the relevant stimulus.

TL;DR: Comparisons of the patterns of neuronal firing and stereoencephalography recorded from the same microelectrodes chronically implanted in the human limbic system were made to study neuronal electrogenesis at onset and during propagation of focal partial complex seizures, leading to the conclusion that SEEG seizures can be generated focally by synchronous firing of fewer than 10% of neurons in the 'epileptic pool.

TL;DR: The LSP may be a factor in the mechanism of unexplained death in persons with epilepsy who exhibited no overt seizure activity at the time of demise, and cardiac arrhythmias were thus associated with subconvulsant (interictal) activity.

TL;DR: Within the latency range of the scalp N2/P3, at least two depth components were identified which are consistent across patients, and topographically distinct, and have task correlates similar to P3.

TL;DR: Common or separate generators for frontal, central and parietal SEPs were discriminated by evaluating the influence of stimulus rate and intensity, as well as of general anesthesia and transient CBF deficits, investigated in 7 patients undergoing carotid endarterectomy.

TL;DR: The latency of wave V of the auditory brain-stem response was within normal limits in the majority of the patients studied regardless of the site of their cortical lesion, and no MLR asymmetries were demonstrated.

TL;DR: The results indicate that using phase coherence to detect the presence of the 40/sec auditory steady-state response, efficient threshold search procedures may be devised to provide fast, accurate, and objective estimates of auditory behavioral thresholds in nearly all normal adults.

TL;DR: The results suggest that alterations occur already at the retinal level where dopamine receptors have been found, and the reported changes of the VEP are not caused by the visual cortex alone.

TL;DR: The steady-state evoked potentials are most efficiently recorded using Fourier analysis, and the response to 500 Hz tones presented at a rate of 40/sec can be reliably recognized on average down to intensities of below 15 dB SL in an awake subject.

TL;DR: The results indicate that the ketamine-induced SD blockade is due neither to epileptic activity nor to enhanced active transport of ions but rather to interference with chemically gated ionic channels and/or to stabilization of postsynaptic membranes.

TL;DR: The results suggest that the SPK represents a massive synaptic excitation of middle apical dendrites triggering synchronous burst discharges in a population of pyramidal cell bodies.

TL;DR: The findings suggest that the N 1 is not affected by Parkinson's disease and that the effect of dopaminergic drugs on the N1 is mediated by actions on dopamine mechanisms elsewhere than in the striatum, perhaps in the cerebral cortex itself.