Showing papers in "Electroencephalography and Clinical Neurophysiology in 1975"

TL;DR: Two distinct late-positive components of the scalp-recorded auditory evoked potential were identified which differed in their latency, scalp topography and psychological correlates.

TL;DR: The findings indicate that "the P3" wave is not a unitary phenomenon but should be considered in terms of a family of waves, differing in their brain generators and in their psychological correlates.

TL;DR: A new type of EEG derivation has been investigated, which detects source activity as it appears at the surface level of the scalp, and is realized in the 10-20 system of electrode placement basically as an analogue superposition of four bipolar derivations, forming a star-like configuration around each electrode.

TL;DR: Three different cortical areas were found with respect to the development, by repeated electrical stimulation, of electrographic and motor seizures in rats, and all areas showed similar reductions in AD thresholds when repeatedly stimulated.

TL;DR: It is suggested that supraspinal connections from motor cortex directly to spinal motoneurons may be enhanced as a result of training to the point where they produce a significant synchronization of motor units during steady, voluntary contractions.

TL;DR: It is concluded that the T complex, comprising a positive peak, Ta, at 105-110 msec, and a negative peak, Tb, at 150-160 msec, is probably a product of secondary auditory cortex.

TL;DR: It was concluded that at moderate intensities of stimulation the primary source of scalp recorded FFR is the IC, and cooling of the IC greatly reduced or eliminated FFR both within this nucleus and at the scalp.

TL;DR: The weighted summation of this polyphasic activity across a limited cortical area (spatial average) is similar to the activity of a non-recursive filter between cortex and scalp and has a low pass characteristic.

TL;DR: It is suggested that the marked increase in the number of arousals may account for the disparity between the subjective reports and objective measures of sleep disturbance at high altitude.

TL;DR: Compared to baseline, REM sleep 24 h was decreased in the normals and increased in the narcoleptic, and time spent in slow wave sleep and stage 2 was also reduced in the normal subjects on the 90-min schedule, and stage 1 sleep time was increased.

TL;DR: The data show that the amplitude of the P300 component is not affected by the presence or absence of a warning stimulus, and the distributions of P300 and the CNV over the scalp are quite different.

TL;DR: Procaine HCl and diphenylhydantoin (DPH) increased the duration and propagation of epileptiform afterdischarges (ADs) produced by electrical stimulation of the amygdala in rats and the effects of these drugs on the responses evoked by anterior neocortex stimulation were quite different.

TL;DR: In this article, the average visual evoked potentials to sequentially flashed words comprising a sentence were recorded from vertex and left and right temporoparietal electrodes in 8 right-handed subjects.

TL;DR: It was concluded that this N1 enhancement reflects a "finely tuned" selective attention to one channel of stimuli among several concurrent and competing channels and a probable relationship exists between the information load on the subject and the magnitude of this EP enhancement with selective attention.

TL;DR: The technique was applied to the alpha rhythm indicating a posterior locus compatible with the view that alpha rhythm is generated chiefly by posterior cerebral cortex, and the distribution of amplitudes at latencies within Wave V of the visual evoked response confirmed the loci of equivalent generators within posterior cerebral regions.

TL;DR: Review of the literature concerning evoked potential correlates of differential hemispheric processing pointed up flaws in design, statistical technique, and inconsistencies in reported findings which suggested that while Evoked potentials may sometimes reflect differences in hemispheres functioning, this effect is marginal at best.

TL;DR: In this paper, the EEG preceding and following the myoclonic jerk was simultaneously averaged by the CNV program to overcome various drawbacks of the conventional polygraphic study of a relationship between myoclonus and EEG.

TL;DR: During sleep, swallowing is episodic, with long swallow-free periods, andallows occur almost exculusively in association with movement arousals which are most frequent during Stages REM, 1 and 2 of sleep.

TL;DR: The results of the present study suggest that patterns of scalp EEG coherence may reflect some aspects of the underlying pattern of anatomical pathways, as well as the more dynamic properties of task difficulty and visual--motor practice.

TL;DR: AEPs are a reliable elicited measure which correlate well with maturation and can be a useful tool both in the study of central nervous system development and in the diagnosis of sensory and neurologic abnormalities.

TL;DR: The study of signs showed that association between blinking and persistence of the activity of the chin muscles during paradoxical sleep is never encountered, and the possibility that lesions of the locus coeruleus are responsible for this decrease in paradoxicalSleep is discussed.

TL;DR: EEG recordings from freely moving, seizure sensitive gerbils during seizures of varying severity strengthen the suggestion that selectively bred epileptic strains of Meriones unguiculatus may be a suitable animal model for the study of the epilepsy.

TL;DR: The adaptation of the responses from the cochlear nerve and the auditory brainstem nuclei was studied using a burst of four clicks as the stimulus and the more central brainstem responses showed less adaptation than the peripheral responses.

TL;DR: Recruiting responses and related synchronous activities appear to be mediated by thalamic inhibition originating in nucleus reticularis thalami, a structure jointly regulated by an ascending projection from mesencephalic reticular formation and a descending influence from the frontal cortex.

TL;DR: The left and right hemispheric responses to speech or tones, either frequent or target, were strikingly similar, both to the eye and by statistical tests intended to reveal differences between them.

TL;DR: It was shown that tetanic stimulation, but not recruiting stimulation, low frequency stimulation, or handling, would produce a permanent change in potentials evoked in secondary sites by single pulses applied to the amygdala, smaller than that produced by kindling.

TL;DR: It is shown that a previous formulation of the Wiener filter for use in the estimation of evoked potentials is incorrect and the origin of anomalies thereby produced is discussed.

TL;DR: The results show the reliability and value of this simple computer display for the particular type of EEG studied, whereas in the frontal and occipital regions the EEG was slightly more accurate than the canonogram, both methods were similar in the temporal areas and the canonograms seemed more accurate in the centro-parietal regions.