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Results for “Spectrum Analysis”

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At least 451 records · Page 25Linked to original sources
PubMed1979

Spectrum analysis of the EEG in schizophrenic patients.

A method is presented for the harmonic analysis of the human EEG. Its use for the study of schizophrenic patients under phenothiazine treatment is discussed and some examples are given. Correlations are observed with clinical evolution and plasma level of the drugs.

Antipsychotic Agents↗
PubMedDate not supplied

EEG spectrum analysis techniques applied to the problem of psi phenomena.

Electroencephalographic techniques were used to study unusual sensory capabilities. One S, the "sender," of a pair of Ss was stimulated with 10 sec duration trains of flicker at 6 or 16 fps, randomly interspersed with periods of no flicker. EEGs were recorded from another S, the "receiver," to determine if EEG driving or alpha block would be evident on trials when the sender was stimulated, compared to when the sender was not stimulated. Differential alpha block on control and stimulus trials was observed reliably in one receiver, indicating some information transfer. The S's overt indications of which stimulus occurred were not different from what would be expected by chance. The physical parameters by which the EEG effect was mediated were not determined.

Alpha Rhythm↗
PubMed1977

[Spectrum analysis of stabilograms with special reference to changes following whole body vibration].

The location of the body's gravicenter in the horizontal plane was measured by means of a force platform. The 4 male subjects stood upright with eyes closed. Power-density spectra of the frontal and sagittal stabilograms were estimated. Repeated investigations made it possible to assess intraindividual variability and to evaluate significant interindividual differences. The power spectral density was not altered by a controlled sitting posture observed for 30 min. Low-frequency whole-body vibration with an exposure time of 30 min and a permissible level according to the "fatigue decreased proficiency boundary" (International Standard ISO 2631) induced a significant increase of the power spectral density below 0.25 Hz and a decrease above this frequency. The results indicate that the power density spectral analysis of stabilograms is a suitable method for evaluating a biological effect of vibration.

Humans↗
PubMed1983

Evaluation of cerebral blood flow in the normal neonate by Doppler spectrum analysis.

Continuous wave Doppler ultrasound has seldom been applied to the evaluation of the cerebral circulation of the newborn infant. Twenty-five term infants were studied and records taken from the common carotid and anterior cerebral arteries during the first week of life using a bidirectional Doppler instrument. The best Doppler signals obtained were audiofrequency analysed and sonagrams recorded. Analysis of the carotid sonagrams revealed a mean Pulsatility Index (PI) on the first day of life of 0.98 compared to 0.88 on Day 2 (p less than 0.001). An unexpected finding was the absence of continuous carotid blood flow in the majority of infants in the first hours of life. The PI on subsequent days did not differ significantly from Day 2. The PI of the anterior cerebral arteries on Day 1 was significantly elevated (p less than 0.001) compared to Day 2 and subsequent days. The significance of these findings and their importance in the further evaluation of pathological cerebral states in the neonate, especially birth asphyxia and intracranial haemorrhage are discussed.

Asphyxia Neonatorum↗