Showing papers in "Electroencephalography and Clinical Neurophysiology in 1980"

TL;DR: A method is proposed to determine components of evoked scalp potentials, in terms of times of occurrence (latency) and location on the scalp (topography), suggesting a stable localization of the generating process in depth.

TL;DR: It was concluded that the effect of selective auditory attention on the N1 component is not due solely to an enlargement of the exogenous N1 components of the vertex potential, but rather includes the addition of a prolonged endogenous component.

TL;DR: In this article, scalp-recorded potential changes associated with voluntary, self-paced middle finger flexion and extension were studied by an opisthochronic averaging program in 14 normal right-handed subjects.

TL;DR: Early somatosensory evoked potential components to median nerve or finger stimulation were recorded with non-cephalic references in normal young adults to identify spinal entry time with the onset of the neck N11 or scalp P11 and suggest that FF3-FF4 are generated in medial lemniscus rather than above the thalamus.

TL;DR: It was found that the alpha rhythms of the LGN influenced only moderately the coherence between cortical alpha rhythms whereas that of the pulvinar had much more influence, at least in relation to some cortical areas.

TL;DR: Unimodal distributions of frequencies within this range for each of 3 species (cat, rat and rabbit) are reported here with proportionality between means and variances.

TL;DR: The findings demonstrate a complex spatial and temporal distribution of electrical events within the auditory brain stem pathways, which preclude any simple one-to-one relationship between a given anatomical site and a particular component of the ABR.

TL;DR: The relationship of reaction time and P3 latency of single trials was examined by the adaptive filter technique and there was no difference between the old and young subjects as both groups revealed signficant, positive P 3 latency-reaction time correlations.

TL;DR: The results underline the critical role played by the cortex of the posterior-superior temporal plane and the adjacent cortex ofThe parietal lobe in the production of the N1 component.

TL;DR: Frontal and parietal SEPs to electrical stimulation of fingers were studied in conjunction with the spinal SEP and sensory nerve action potentials in 25 young adults and 19 healthy octogenarians and it is suggested that the sequential activation of cortical modules in parietal and frontal areas could generate successive SEP components.

TL;DR: The sensitivity of some of the ERP components in distinguishing schizophrenics from controls depended on the conditions under which the component was elicited, and amplitude was smaller in the schizophrenics than in the controls after longer interstimulus intervals.

TL;DR: Discrete lesions of the brain stem auditory pathway in cats were found to have complex effects on the auditory brain stem response (ABR), which ranged from an amplitude change on only a single component of the ABR to latency and amplitude changes for that component plus some or all of the subsequent components.

TL;DR: Highly significant differences of SCP between the two required polarities were demonstrated and the most pronounced differences were observed during test trials without feedback of the second session in which a positive shift below baseline level occurred when positivity (or less negativity) was required.

TL;DR: Although BI (in the 6 msec latency region) was observed in the difference trace for the majority of subjects' BSEP, there were no significant differences between binaural and predicted-binaural responses in the group means for individual peak amplitudes and latencies.

TL;DR: The hypothesis that occipital potentials following relevant and irrelevant stimuli reflect not only differential processing ofrelevant and irrelevant information but also reflect a progressive change in the unit or specificity of the differential processing is supported.

TL;DR: The calssification of the background EEG was well correlated with the disturbance of sleep cycle, which was also related to the interval after the hypoxic insult, and the relation between sleep states and EEG patterns also had a close correlation with the classification and became progressively disrupted with increasing severity of the Background EEG.

TL;DR: The results suggest that appearance of Fm theta shows individual differences and there might exist some periodicity of an attention mechanism in certain subjects.

TL;DR: Evidence indicates that the scalp-recorded Pa of cats is generated almost entirely from the anterior part of the contralateral AI, which is a surface-positive wave restricted to the anterior portion of AI.

TL;DR: A method is described for the construction of a 6-barrel electrode, enabling intra- or extracellular recording from a protruding barrel and iontophoretic ejection from the remaining 5 barrels, enabling each laboratory to employ the recording electrode most suitable for its research.

TL;DR: Aspects of sleep stage evaluation and analysis of alpha and delta EEG frequencies in sleep were shown to be related to musculo-skeletal pain and mood disturbance in patients with 'fibrositis syndrome'.

TL;DR: The latencies and field distributions suggest that the cervical potentials represent a negative field near the generator site and that the scalp recorded potentials are primarily attributable to an approaching field of positivity from the same source.

TL;DR: In non-cephalic reference recordings, the scalp recorded short latency evoked potentials to median nerve stimulation in normal subjects consist of 3 positive potentials followed by a negative potential, which suggests that this potential arises primarily in brain stem pathways.

TL;DR: It is hypothesize that the smaller P3s in schizophrenics represent a deficit in reactivity to unexpected stimuli that is compatible with normal RT performance.

TL;DR: The PCVA showed that there was significant CNV activity in the post-stimulus epoch and therefore the CNV represents another source of overlap with P300 and slow wave when peak-to-baseline measures are used.

TL;DR: The techniques described were suitable for electrophysiological testing of fifth nerve function in routine clinical applications and indirect tests supported the view that muscle potentials did not significantly contribute to the characteristic response.

TL;DR: In an epileptic patient with depth electrodes placed in the hippocampus, there existed a significant peak in the theta band of the hippocampal EEG of this subject under a number of behavioural circumstances.

TL;DR: The results indicate that an analysis of sleep induced changes in depth spike activity can be useful in improving predictions concerning epileptogenicity, and quantification of other aspects of the interictal EEG, such as background activity, may further improve such predictions.

TL;DR: Somatosensory evoked potentials were recorded simultaneously from the cervical spine and scalp in 25 normal subjects and 105 patients with established or suspected multiple sclerosis using median nerve stimulation and a small group of MS suspects showed abnormality of P40 or (P40 -- N21).

TL;DR: The EEG maturation in girls up to 11 years seems to be retarded compared with boys: the mean percentage of slower activity is higher, and of faster activity is lower, in girls than boys.