Showing papers in "Electroencephalography and Clinical Neurophysiology in 1983"

TL;DR: EMCP permits retention of all trials in an ERP experiment, irrespective of ocular artifact, and has the advantage that separate correction factors are computed for blinks and movements and that these factors are based on data from the experimental session itself rather than from a separate calibration session.

TL;DR: Analysis of the pattern of the magnetic field showed that the sources of N2 and P3 lay deep in the brain within the hippocampal formation, similar to the commonly observed N2-P3 complex.

TL;DR: The spherical model can now be used with more confidence to predict differences in neural sources which cannot be approximated by a dipole, and the MEG-EEG differences will depend on the particular case.

TL;DR: It was concluded that these AEP and SEP norms can probably be used in other laboratories if stimulating and recording conditions are similar, however, VEP results are difficult to transfer due to the poorly understood effects of variation in stimulus conditions.

TL;DR: The earliest changes in the resting EEG in SDAT are increased theta and decreased beta power, which are not identical to those reported in normal aging, in which a decrease in alpha activity accompanies the changes inTheta and beta.

TL;DR: The data for P3 latency and age are best fitted with a curvilinear first and second degree orthogonal polynomial, which describes a positively accelerating latency increase with age.

TL;DR: Selective attention tasks involving random sequences of electrical stimulation of fingers were designed to compare cerebral potentials to identical stimuli when they are 'infrequent target' signals or 'frequent-neglected' signals in the series.

TL;DR: It is proposed that N18 reflects several deeply located generators in brain stem and/or thalamus whereas N20 represents the earliest cortical response of the contralateral post-central receiving areas.

TL;DR: Rohrbaugh et al. as mentioned in this paper found that a slow negative shift in potential, recordable extracranially, appears during the second or so preceding a signal to which a subject is supposed to respond.

TL;DR: Small time differences between the EEG activities of two channels were measured by a method based on the use of coherence and phase spectra over a certain frequency range to assess the presence of an epileptic focus even when only widespread seizure activity could be recorded.

TL;DR: A method is described for the automatic analysis of EMG interference patterns obtained at optional non-controlled force levels that is objective, reproducible, fast and needs relatively small computer facilities.

TL;DR: Data interpreted as supporting the hypothesis that each component of the ABR arises from a focal region of the brain stem auditory pathway are recorded between the skull and a non-cephalic reference in guinea pig.

TL;DR: Somatosensory evoked potentials (SEPs) were elicited by stimulation of the right posterior tibial nerve at the ankle in 20 experiments on 18 normal adults and several positive far fields with widespread scalp distribution and stationary latencies have been identified.

TL;DR: Findings indicate that the degree of bilateral independence in medial temporal lobe spike activity tends to decrease several minutes prior to the localized onset of temporal lobe seizures; such changes may reflect the mechanisms responsible for the inter-ictal-ictsal transition.

TL;DR: The 100% detection rate of VEP asymmetry in albinos and 0 false positives in normal controls, heterozygote family members and non-albino patients with comparable albino symptoms indicates that VEPymmetry is a decisive clinical measure for the diagnosis of albinism and for differential diagnosis.

TL;DR: It is suggested that speed instructions and discrimination difficulty affect stimulus processing time and response production time differently, and that P3 was considerably larger during the Speed than Accuracy conditions.

TL;DR: It was found that the schizophrenic group showed increased low frequency energy in the frontal regions and increased fast activity in post-central areas and the left anterior temporal area, suggesting that topographic mapping of brain EEG spectral activity may play a useful role in the functional understanding of schizophrenia.

TL;DR: The biphasic late negative wave (Nx-Ny) evoked during the naming of pictures of objects was investigated and indicated that these components were probably cerebral in origin.

TL;DR: The P38/N38 complex represents the primary cortical response to PTN stimulation and varies slightly from individual to individual in a manner consistent with a functional dipole situated in the leg and foot area on the mesial aspect of the postcentral gyrus.

TL;DR: The preliminary results suggest that objective measurement of alertness can be of value in many applications, such as in pharmacological research, in evaluation of certain psychic symptoms and in working environment studies.

TL;DR: The fatigue effects on reflexly induced contractions show that fatigue took place primarily in the contractile processes and that muscle spindle sensitivity was increased during fatigue loading, which supports the differential fatiguing properties of fast twitch and slow twitch muscle fibres.

TL;DR: In the simulations of Macro EMG the area of the signal appears to be a better measure of the strength of the motor unit than the amplitude, and therefore new aspects of the Motor unit can be quantified.

TL;DR: Pattern reversal visually evoked potentials (VEPs) were recorded from 439 infants and young children ranging in age from 1 month to 5 years in response to large and small checks and showed that P1 latency decreases rapidly during the first year of life, and that the time course of the latency change differs as a function of check size.

TL;DR: This study implicates the trapezoid body as contributing to the generation of auditory brain stem components beginning with N2, and identifies the altered components by their latency and amplitude changes as a function of both stimulus intensity and rate.

TL;DR: Transient visually evoked potentials recorded in response to the contrast reversal and onset of spatially sinusoidal gratings were investigated and it was suggested that two positive components interact resulting in a departure from a monotonic relationship between latency and spatial frequency.

TL;DR: The results clarify the temporal pattern of physiological vigilance during performance in narcoleptics and also demonstrate the insufficiency of the lapse-microsleep formulation in explaining performance deterioration in these patients.

TL;DR: The findings show that N20 arises in multiple generator sources of both far- and near-field origin and that multiple generators contribute to the SEP within 10-15 msec of the arrival of the volley in cerebral cortical elements.

TL;DR: It is suggested that auditory brain stem structures contralateral to the midline of the trapezoid body generate components N2, P 3, N3, N4, whereas auditory structures ipsilateral to theMidline generate components P1, N1, P2 and P4, and binaural interaction in P4 and N4 was attenuated in a linear manner as a function of the extent of trapezoids body section.

TL;DR: It is suggested that the P165, N2 and P3 components comprise a functional sequence in the processing of rare events and possibly involved in a subject's preparations for the future.