Showing papers in "Electroencephalography and Clinical Neurophysiology in 1979"

TL;DR: A method of accurate storage and on-line preprocessing of an EEG signal, preceding and following a trigger signal, elicited by button pressing, is described to study changes occurring in the power of the rhythmic activity within the alpha band in central areas, during voluntary, self-paced movement in 10 normal humans.

TL;DR: The spatial response of the magnetoencephalogram (MEG) to sources in the brain's cortex is compared with that of the electroencephalogyram (EEG) using computer modeling of the head which is approximated by 4 concentric spherical regions that represent the brain and surrounding bone and tissue.

TL;DR: In this paper, a series of epidural and intracortical locations following stimulation of the contralateral median nerve in the monkey have been identified as the sources of the average somatosensory evoked potentials (SEPs) and associated multiple unit activity (MUA).

TL;DR: The difference between RT and P3 slopes represents the additional time per digit which the subjects waits before making a response, due to low confidence occurring with more difficult task conditions (i.e., when set size = 4).

TL;DR: P350 and CNV are dissociable: they are distinct events that involve roughly coextensive brain generators, but result from the operation of different prefrontal cortex controls on the MRF output to the telencephalon, in cognitive behavior.

TL;DR: In the monkey, a particular type of spontaneous ECoG rhythm develops when the subject is motionless and fixes its attention on a visual target in its surroundings, and the rolandic portion of these rhythms belongs to the 'mu' type as described in man.

TL;DR: The adaptation of the method for use during overnight recordings in free-moving unattended patients, in combination with the already existing seizure monitoring system is described, indicating a high vari ability in the performance, mainly because of artefacts.

TL;DR: Cerebral potentials preceding voluntary bilateral simultaneous finger movements were investigated in 19 right-handed young adult subjects, and were compared with unilateral right-sided finger movements in the same experiment, revealing differences in movement onset.

TL;DR: Ten chronic alcoholics and ten age and sex matched controls were tested on an ERP paradigm which elicited a large P3 component and single trial analysis using Woody's adaptive filter demonstrated that the single trial estimates for the 3 latency were significantly prolonged for the alcoholics.

TL;DR: The Multiple Sleep Latency Test can provide physicians with data useful in the diagnosis of narcolepsy, and it is concluded that this procedure can receive physicians' approval.

TL;DR: The non-iterative estimation method is applied to two examples taken from existing literature, demonstrating the similarity of conduction velocity and fiber diameter distributions, sensitivity of the estimate to variations in important model parameters, and applicability to the differentiation of normal and abnormal nerve function.

TL;DR: The multivariate decision rules reveal the essential EEG patterns which differentiate performance of two tasks, which are consistent with, and extend the results of, visual EEG interpretations and univariate analysis of spectral intensities.

TL;DR: This method appears to have clinical applications in the electrophysiological assessment of peripheral nerve function and does not require explicit knowledge of the single-fiber action potential wave shapes in order to yield a unique estimate of the conduction velocity distribution.

TL;DR: Observations support the hypothesis that the epileptic bursts of feline generalized penicillin epilepsy are induced by thalamocortical volleys normally involved in spindle genesis, and indicate that the intracortical electrophysiological events of typical and atypical epileptic Burst are fundamentally the same and reflect an alternation between excitatory and inhibitory sequences.

TL;DR: It is argued that, with the possible exception of 2 patients, the breach rhythms described in this series do not represent enhanced normal mu rhythm and appears to have little relationship to epilepsy and is not an indicator of recurrence of a tumour.

TL;DR: A spatio-temporal analysis of the successive and simultaneous components of the pattern-evoked potential recorded on the scalp, and of their modifications according to which part of the visual field is stimulated, was carried out with 20 'normal' subjects, to shed some light on their most probable sites of origin.

TL;DR: The principle of 'a static charge sensitive bed' method for recording body movements during sleep is described and the measured total number of movements per night is in agreement with the findings of studies based on a combination of direct observation, EMG and videotape.

TL;DR: It is concluded that the results are consistent with the current view that a long-loop pathway, probably involving the cortex, contributes to the FSR in response to sustained stretch in man.

TL;DR: In all age groups the speed of conduction up the spine was non-linear and was slower over caudal spinal cord segments than over peripheral nerve or rostral spinal cord.

TL;DR: Motor threshold stimulation gave consistently submaximal responses and probably does not represent an optimal intensity for routine use, but the sum of motor plus sensory threshold gave potentials which were consistently at, or close to, maximal in amplitude.

TL;DR: Hippocampal evoked potentials and EEG responses were studied in rats, using a classical conditioning paradigm with a spatially discontiguous CS-US arrangement, and changes are related to orienting, attentional factors rather than to movement-related variables.

TL;DR: A method for isolating and removing very slow activity from EEG records prior to spectrum computation is presented by an autoregressive filter whose frequency transfer characteristic can be easily controlled.

TL;DR: It is concluded that the EEG patterns which differentiated the complex tasks described in Part I were due to inter-task differences in stimulus characteristics, efferent activities and/or performance-related factors, rather than to cognitive differences.

TL;DR: The paper shows that BTT is longest in neonates, approaches adult values at the age of about 3 years, is relatively independent of click intensity, conductive hearing loss (middle ear lesion), click rate (except for high rates) and click frequency (filtered clicks).

TL;DR: In this article, it was shown that rewarding spectral shifts (i.e. increase in amplitude or peak frequency of the hippocampal EEG) causes a solitary dog to show increased motor behaviour.

TL;DR: Establishing normative data will allow greater inter-study reliability, and form the basis for other prospective studies of infants 'at risk' to investigate whether those that lag behind the norm in these indices when followed serially during the newborn period differ prognostically from those who recover and reach expected norms for conceptional age.

TL;DR: In a group of 8 subjects, the late CNV and the BP exhibited: similar effects of response speed variation, corresponding influences of subjective factors, and a similar scalp distribution with the exception that the BP was much more lateralized.

TL;DR: It is hypothesized that both the transient shifts and the P350 are produced by variations in the level of neuromodulation of the cortical circuits by the mesencephalic reticular formation (MRF).

TL;DR: Age-related changes in the central nervous system were demonstrated with EEG even-related potentials in healthy, aged women, interpreted as neurophysiological reflections of CNS deterioration found in non-senile elderly persons.