Data Acquisition in Neurophysiology a Flexible Microcomputer System for Recording Neurophysiological Data

McAllister, H.G.; Armstrong, G.A.; McClelland, R. J.; Linggard, R.

doi:10.3109/03005368309081489

Cited by 30 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the majority of babies were in an indeterminate state, because of the encephalopathy. When the babies were in a steady state, four eight-second artefact-free epochs of EEG were sampled into Apple RAM and stored on disk, using a purpose-built data acquisition interface and controlling software described previously (McAllister et al 1983). Artefacts were excluded by one observer (A.B.).…”

Section: Methodsmentioning

confidence: 99%

Power Spectral Analysis of the Eeg of Term Infants Following Birth Asphyxia

Bell

McClure

Hicks

1990

Develop Med Child Neuro

View full text Add to dashboard Cite

SUMMARY The aim of this pilot study was to perform power spectral analysis of the EEGs of term infants following birth asphyxia, to establish its value as a prognostic indicator. 16 term infants were studied over an 18‐month period. Power spectral analysis was performed on the EEGs of babies with signs of hypoxic‐ishaemic encephalopathy at regular intervals during the first five days of life. It showed distinct changes following birth asphyxia, which were related to the eventual outcome of the babies. Absolute power was significantly reduced in the babies with poor outcome compared with those with good outcome, particularly in the delta bands. RÉSUMÉ Analyse spectrale de puissance des EEG de nourrissons nés à terme et ayant souffert d'asphyxie à lanaissance Le but de cette étude pilote a été de réaliser une analyse spectrale de puissance de nourrissons nés à terme et ayant souffert d'asphyxie à la naissance, pour établir sa valeur pronostique. Seize nourrissons nés à terme ont été étudiés sur une période de 18 mois. Une analyse spectrale de puissance a été réalisée sur les EEG de nourrissons présentant des signes d'encéphalopathie hypoxique‐ischémique durant les cinq premiers jours de vie. L'analyse spectrale de fréquence a montré des modifications spécifiques à la suite de l'asphyxie néo‐natale, liées au devenir éventuel des nourrissons. La puissance absolue était significativement réduite chez les nourrissons avec mauvais devenir par comparaison avec les nourrissons à bon devenir, particuliérement dans les bandes delta. ZUSAMMENFASSUNG Spektralanalyse von EEGs reifer Neugeborener mit Geburtsasphyxie Das Ziel dieser Pilotstudie bestand darin, Spektralanalysen von EEGs reifer Neugeborener mit Geburtsasphyxie durchzuführen, um ihren prognostischen Wert festzustellen. 16 zum Termin geborene Kinder wurden über einen Zeitraum von 18 Monaten untersucht. Bei Neugeborenen mit hypoxisch‐ischämischer Enzephalopathie wurden in den ersten fünf Lebenstagen in regelmäßigen Abständen Spektralanalysen der EEGs durchgeführt. Die EEG‐Spektralananlysen zeigten nach Geburtsasphyxie bestimmte Veränderungen, die mit dem Outcome der Kinder korrelierten. Bei Kindern mit schlechtem Outcome war das Gesamtspektrum, besonders im Deltabereich, im Vergleich zu den Kindern mit gutem Outcome signikant herabgesetzt. RESUMEN Análisis espectral de potencia en el EEG de recién nacidos con afixia de parto La finalidad de este estudio piloto fue el realizar un análisis espectral de la potencia del EEG en recién nacidos con asfixia al nacer, para establecer su valor como predictivo del pronóstico. Se estudiaron 16 lactantes durante un periodo de 16 meses. El análisis espectral de la potencia se realizó en el EEG de niños con signos de encefalopatia hipóxico‐isquémica a intervalos regulares durante los primeros cinco dias de vida. El análisis espectral de la potencia mostró cambios evidentes siguiendo a la asfixia de parto, lo que se relacionó con el curso eventual de los lactantes. La potencia absoluta se redujo significativamente en los niños con un...

show abstract

Section: Methodsmentioning

confidence: 99%

Power Spectral Analysis of the Eeg of Term Infants Following Birth Asphyxia

Bell

McClure

Hicks

1990

Develop Med Child Neuro

View full text Add to dashboard Cite

show abstract

“…These were collected following completion of the CNV task in the smoking and non-smoking conditions. Signals were amplified using a Grass Neurodata Acquisition System and were processed using the Data Acquisition in Neurophysiology (DAN) system (McAllister et al 1983) with an Apple microprocessor and ancillary hardware. All parameters of the experimental stimuli were under software control.…”

Section: Methodsmentioning

confidence: 99%

Smoking, nicotine dose and the lateralisation of electrocortical activity

1992

View full text Add to dashboard Cite

The effects of cigarette smoking on the balance of activity of the cerebral hemispheres were studied in two experiments. Experiment 1 examined the effects of smoking on lateralisation of EEG alpha and beta power in six male smokers, and revealed a dose-related biphasic action. Low doses of nicotine as measured by residual butt analysis increased left hemisphere activity in a dose related manner, while higher doses (greater than 1.1 mg) reversed this effect. Experiment 2 examined the time course of the changes in EEG alpha, beta, theta and delta lateralisation in 11 male smokers. During the initial period of smoking there was a reduction in EEG alpha, reflecting cortical activation, followed by an increased in alpha power towards the end of the cigarette. These changes were accompanied in smokers taking moderate nicotine doses, by an initial shift towards left hemisphere activation, followed by a reduction in left hemisphere activation relative to the right. Initial changes in delta and theta power were negatively correlated with nicotine dose. Higher nicotine doses were associated with greater shifts towards right hemisphere activation, as indicated by beta and delta lateralisation, and also with greater decreases in subjective arousal. These results were interpreted as supporting the hypothesis that the stimulant action of lower doses of nicotine involves the activation of a left hemisphere "Go" system, while the sedative effect of higher doses involves increased activation of the right hemisphere "NoGo" system.

show abstract

“…folr = 0.83 Gestational age. weeks lowing inspection of the digitised EEG on screen and stored on disk using a purpose built data acquisition interface and controlling software (7).…”

Section: [51-mentioning

confidence: 99%

Spectral Edge Frequency of the EEG in Healthy Neonates and Variation with Behavioural State

Bell

McClure²,

McCullagh³

et al. 1991

Neonatology

View full text Add to dashboard Cite

Spectral edge frequency (SEF) of the EEG was studied in 51 healthy neonates to assess its value as a measure of cerebral maturation. SEF was calculated as the frequency below which 95% of the power in the power spectrum resides. Summated SEF (sSEF) of 4 EEG channels correlated significantly with gestational age (r = 0.83).sSEF varied with behavioural state and with EEG derivation. Intra- and interindividual variability were both greater in preterm compared to term babies. We conclude that SEF is a useful measure of cerebral maturation in the newborn and may have a role in studying stressed newborns.

show abstract

Data Acquisition in Neurophysiology a Flexible Microcomputer System for Recording Neurophysiological Data

Cited by 30 publications

References 0 publications

Power Spectral Analysis of the Eeg of Term Infants Following Birth Asphyxia

Power Spectral Analysis of the Eeg of Term Infants Following Birth Asphyxia

Smoking, nicotine dose and the lateralisation of electrocortical activity

Spectral Edge Frequency of the EEG in Healthy Neonates and Variation with Behavioural State

Contact Info

Product

Resources

About