Showing papers in "Electroencephalography and Clinical Neurophysiology in 1986"

TL;DR: The normal dipole source potentials in the intact hemisphere fully explained scalp distributions in these patients, and presence of late dipole sources potentials, which were delayed by 20-30 msec, probably reflected cortical activation via commissural fibres.

TL;DR: Moves of phase delays as a function of interelectrode distance supported the development of a 'two-compartmental' model of EEG coherence in which different features of coherence are produced by different length fiber systems.

TL;DR: In this article, three experiments were conducted to investigate the 24-hour structure of sleepiness after 1 night of sleep deprivation under two experimental conditions: instructing subjects to attempt to fall asleep or instructing subject to resist sleep.

TL;DR: An auditory discrimination paradigm was employed to elicit the P3 component of the event-related brain potential from 39 demented patients and neurologist ratings of cognitive impairment were significantly correlated with P3 latency values, although no differences in mean latency were obtained between the various categories of dementia.

TL;DR: Delta activity showed a decreasing trend in all schedules and was enhanced as a function of prior waking, and theta activity and REM sleep were increased after 24 h SD.

TL;DR: Evoked potentials recorded from the MTL during verbal recognition memory display two late endogenous components, one of which might be involved with memory formation and retrieval processes, and the other might index completion of the detection-recognition cycle.

TL;DR: Although there was a high correlation between several spectral parameters (parasagittal mean frequency, delta and theta activity, and the theta-beta difference) and the Folstein score, EEG measures used for discriminant analysis were more accurate in identifying demented patients who had lower Folstein scores.

TL;DR: Investigation of factors which could affect the morphological quality and latency of the P3 ERP component from auditory stimuli found passively ignoring the stimulus items decreased P3 amplitude and increased its latency relative to active stimulus discrimination.

TL;DR: The P300 (P3) event-related potential was obtained from 100 undergraduates with a 2-tone auditory discrimination task and replicated trial block procedure and was negatively correlated, most strongly at the Pz electrode site.

TL;DR: Electrical stimuli applied over the cervical vertebrae in the midline excite the motor roots at their exit from the spinal canal, having implications for clinical studies of pyramidal tract and proximal peripheral nerve conduction.

TL;DR: These data lend particular support to a functional relation between wave A and the ascending reticular activating system and suggest that this potential may provide a unique and dynamic probe of tonic brain activity.

TL;DR: Middle latency responses (MLRs), in the 10-100 msec latency range evoked by click stimuli, were examined in two sets of 7 adult subjects utilizing 5 randomly ordered rates of stimulus presentation and revealed that the P1 component was reduced in amplitude or absent at the faster rates, while the amplitude of the Pa component remained unchanged across rates.

TL;DR: A pattern of results suggests that STH is a function of the acoustic resemblance of successive stimuli, and standard and deviant stimuli that differed in phonetic structure showed more cross-habituation than did tones or complex tones that differ in frequency.

TL;DR: Insomniacs have increased beta and decreased alpha activity relative to normals prior to the onset of stage 2 sleep, and the present data suggest that a CNS component of this activity, reflected by increased beta EEG, is reactivated during REM sleep.

TL;DR: Evidence that the right hemisphere has a more diffuse receptotopic organization than the left, together with evidence that it may have a higher proportion of white to gray matter, suggests a high degree of functional connectedness among right hemisphere regions.

TL;DR: The dependence of the amplitude and timing of the pre-stimulus negativity on the temporal location of information, in conjunction with its independence of motor response requirement, suggests that thePre- Stimulus negativity reflects some operation in the domain of expectancy, anticipation or 'mental preparation' for the informational stimulus.

TL;DR: Recording movement-related cortical potentials to voluntary middle finger extension from 10 young and 10 old subjects free of neurological disease using the method of detecting EMG onset associated with each movement identified a third shift intervening between BP and NS' and was named the intermediate shift.

TL;DR: The conclusion that the contralateral parietal N20 and central P22 could be generated by separate dipolar generators with distinct orientations is supported by recent data from combined electrical and magnetic field recording.

TL;DR: Nasal CPAP completely abolished all obstructive apneas and allowed apnea-free breathing in all 12 patients and significantly reduced stage I/II non-rapid eye movement (NREM) sleep and markedly increased stage III/IV NREM and REM sleep on the first treatment night.

TL;DR: The field pattern suggested neural activation in the upper bank of the sylvian fissure near the lateral end of the central sulcus, i.e., at or near SII, contributes to the generation of the electrical vertex potential.

TL;DR: The results confirm the superiority and greater sensitivity of the SEP in detecting abnormalities of brain function shortly after severe head trauma and of little prognostic significance.

TL;DR: By fitting the gradient of computer simulated fields to those measured outside the cranium, the accuracy of source localization was substantially improved and the greatest distortion of the extracranial magnetic field was an inequality in the measured amplitude of the two extrema.

TL;DR: The data do not support the hypothesis of a continuum from aging to mental deterioration, and a sex-linked difference is found in the elderly group, where women have less delta and more beta frequency than men.

TL;DR: These P3 latency data are consistent with the notion that the task causes subjects to adopt different strategies and hence different types of processing (i.e., serial vs. parallel).

TL;DR: The close temporal coupling between N2 and P3 suggests that N2 may reflect cognitive properties in common to P3 in stimulus evaluation processes and support a distinction between the earlier and the later components of the ERP.

TL;DR: It was concluded that several inhibitory neural influences can have an additive effect in profoundly reducing motor pool excitability and it is suggested that the proprioceptive neuromuscular facilitation (PNF) methods provide the greatest potential for muscle lengthening.

TL;DR: The amount of waking in the elderly was not inversely correlated with spindle abundance, confirming earlier observations but in a much larger group, and a linear increase in spindle density and duration across NREMPs in young adults was demonstrated, indicating that age affects the temporal pattern as well as the quantity of spindles.

TL;DR: Differences in Pa amplitude and latency were not due exclusively to changes in auditory thresholds, since they were not duplicated by changes in stimulus intensity, and persisted when MAEPs from selected young and old subjects were compared at similar SPL levels.

TL;DR: Evidence suggests that the surface P3 is generated, but in part only, by the MTL, and that at more superficial intracranial sites, the TSW was relatively smaller than the P3.