abstract：:EEG-signals were recorded from subjects as they performed a modified version of Schneider's and Shiffrin's memory search paradigm. The hypothesis was tested whether individual (centre of gravity) alpha frequency, termed IAF, is related to memory performance and/or attentional demands. The results show that memory perf...

journal_title：Brain topography

authors： Klimesch W,Schimke H,Pfurtscheller G

更新日期：1993-04-01 00:00:00

abstract：:This paper describes a set of proposed standardized quantitative descriptors of event-related potentials, based upon principal component varimax analysis (PCVA). No claim is made that these mathematical descriptors correspond to discrete neurophysiological processes which generate the ERP. However, adoption and prospe...

journal_title：Brain topography

authors： John ER,Easton P,Prichep LS,Friedman J

更新日期：1993-01-01 00:00:00

abstract：:Median nerve somatosensory evoked potentials were recorded from exposed cerebral cortex during craniotomies. This technique is valuable when knowledge of the motor cortex location can influence surgical decisions about resection limits or biopsy sites. Two different recording techniques were compared: strips of electr...

journal_title：Brain topography

authors： Nuwer MR,Banoczi WR,Cloughesy TF,Hoch DB,Peacock W,Levesque MF,Black KL,Martin NA,Becker DP

更新日期：1992-10-01 00:00:00

abstract：:Spatial principal components analysis (SPCA) applied to the ongoing EEG yields factor loadings which, when mapped, consistently reveal symmetrical patterns resembling the spherical harmonics. In this paper, we consider the mechanisms responsible for these characteristic patterns. In doing so, we demonstrate that volum...

journal_title：Brain topography

authors： Silberstein RB,Cadusch PJ

更新日期：1992-07-01 00:00:00

abstract：:In this mapping study of the entire scalp area, the responses to flash (FL) and pattern reversal (PR) stimuli were studied in 34 normal subjects. The N70, P100, N135 and P180 were similar from both stimuli but with some differences in amplitude and latency, especially the variability of the latency of P100 from FL. A ...

journal_title：Brain topography

authors： Hughes JR,Kuruvilla A,Fino JJ

更新日期：1992-04-01 00:00:00

abstract：:The use of tracers is an important technique available for studying cerebral function. Changes in 'signal' are large, but as a result of its photon limited nature, the measurement of this signal is limited: spatially, temporally and in terms of accuracy. The most commonly used single photon (SPECT) system (as apposed ...

journal_title：Brain topography

authors： Todd-Pokropek AE

更新日期：1992-01-01 00:00:00

abstract：:A new residual function in the inverse problem of equivalent dipole localization methods is proposed which is based on the spatial correlation of the background EEG. This residual has the advantage that it allows the calculation of confidence limits for dipole model parameters. The method was applied to VEP data, and ...

journal_title：Brain topography

authors： Yamazaki T,van Dijk BW,Spekreijse H

更新日期：1992-01-01 00:00:00

abstract：:The topography of the visual evoked magnetic response (VEMR) to pattern reversal stimulation was studied in four normal subjects using a single channel BTI magnetometer. VEMRs were recorded from 20 locations over the occipital scalp and the topographic distribution of the most consistent component (P100M) studied. A s...

journal_title：Brain topography

authors： Harding GF,Janday B,Armstrong RA

更新日期：1991-10-01 00:00:00

abstract：:In 148 patients with focal cerebral lesions the findings of EEG mapping, routine EEG and CT were compared. Regarding etiology 43 patients suffered from completed stroke (CS), 43 patients from transient ischemic attack (TIA), 33 patients had an intracerebral hemorrhage (ICH) and 29 an hemispheric tumor. In 37 patients ...

journal_title：Brain topography

authors： Logar C,Boswell M

更新日期：1991-07-01 00:00:00

abstract：:The term "magnetic source image" (MSI) describes the distribution of neuronal activity in the brain that can be deduced from measurements of the field pattern it produces across the scalp. The signals which provide the basis for an MSI are obtained from the magnetoencephalogram (MEG) which is conventionally recorded w...

journal_title：Brain topography

authors： Williamson SJ,Lü ZL,Karron D,Kaufman L

更新日期：1991-01-01 00:00:00

abstract：:Ten right-handed students were submitted to a protocol of cognitive visual stimulations based on six successive sequences: EC1, EO, B1, B2, B3, EC2. Following a first "eyes closed" (EC1) multiple EEG recording (16 EEG leads, plus polygraphy), and an "eyes-open" recording (EO) with central visual fixation, 60 computer-...

journal_title：Brain topography

authors： Etévenon P,Eustache F,Mitermite F,Lepaisant J,Lechevalier B,Zarifian E

更新日期：1990-10-01 00:00:00

abstract：:Topographic mapping of brain electrical activity has become a commonly used method in the clinical as well as research laboratory. To enhance analytic power and accuracy, mapping applications often involve statistical paradigms for the detection of abnormality or difference. Because mapping studies involve many measur...

journal_title：Brain topography

authors： Duffy FH,Jones K,Bartels P,Albert M,McAnulty GB,Als H

更新日期：1990-10-01 00:00:00

abstract：:Topographical analysis of cerebral electrical activity was performed in 44 patients with hepatic encephalopathy. These patients were classified in 5 groups according to clinical criteria. Eight healthy subjects were used as a control group. All were studied in an awake, eyes closed, condition and some [Control Group (...

journal_title：Brain topography

authors： Sagalés T,Gimeno V,de la Calzada MD,Casellas F,Dolors Macià M,Villar Soriano M

更新日期：1990-04-01 00:00:00

abstract：:This study examined the effect of modality of stimulation on two measures of cerebral function: (a) the scalp distribution of sensory evoked potentials and (b) the cerebral distribution of radiolabelled HMPAO. Steady-state stimulation in the auditory, somatosensory or visual modality was presented to six subjects. Sca...

journal_title：Brain topography

authors： Weinberg H,Johnson B,Cohen P,Crisp D,Robertson A

更新日期：1989-10-01 00:00:00

abstract：:Singular value decomposition is a robust numerical method for decomposing a matrix of multichannel EEG or EP data into a sharply reduced set of features with corresponding waveform, amplitude, and spatial vectors. In 19 normal subjects aged 19 to 40 years, the three largest features computed by the SVD algorithm accou...

journal_title：Brain topography

authors： Harner RN,Riggio S

更新日期：1989-10-01 00:00:00

abstract：:In elderly patients presenting to an ambulatory practice with complaints of cognitive disturbance, early dementia must be differentiated from depression. The present paper describes the application of standard electroencephalography and evoked potential testing (EEG/EP) and computerized electroencephalography with evo...

journal_title：Brain topography

authors： Jordan SE,Nowacki R,Nuwer M

更新日期：1989-07-01 00:00:00

abstract：:We studied the magnetic field maps generated by six dipoles in the temporal region of a plastic skull filled with conducting gel. The data were processed with two mathematical models. One, using Biot-Savart's law, considered only the magnetic field generated by a localized current dipole, and the other considered a di...

journal_title：Brain topography

authors： Rose DF,Ducla-Soares E,Sato S

更新日期：1989-04-01 00:00:00

abstract：:The scalp topography of the middle latency auditory evoked potential (MLAEP) Pa component following left and right ear click stimulation was investigated in 15 normal hearing and neurologically intact right-handed subjects. An unbiased reference was employed. The Pa component showed a broad voltage field that was reco...

journal_title：Brain topography

authors： Jacobson GP,Grayson AS

更新日期：1988-10-01 00:00:00

abstract：:The accuracy and precision of topographic maps depicting scalp potentials and scalp potentials squared have been examined. Electrode placement was that specified by the International 10-20 System and the methods of interpolation bilinear and bicubic spines. The results indicate that, for these interpolation methods, t...

journal_title：Brain topography

authors： Koles ZJ,Paranjape RB

更新日期：1988-01-01 00:00:00