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Biomedical subjects

K Azumi

Publications and source records attributed to K Azumi.

At least 37 records · Page 2Linked to original sources
PubMed1987

Filter transient response to EEG waveforms.

The response of two types of linear filters to sinusoidal bursts was calculated to demonstrate how filters can distort EEG waveforms. Results show that the wider the filter bandwidth the less is the distortion, and for a given bandwidth, the higher the filter order the greater the distortion. The response of a linear phase filter was also calculated to demonstrate that this type of filter can also cause waveform distortion, although it is normally less than that caused by Butterworth, Tchebychev and elliptic filters.

Electroencephalography↗
PubMed1982

Characteristics of spindle activity and their use in evaluation of hypnotics.

The spindle activity of 10 healthy male adults, aged 20-24 years, was investigated over 7 consecutive nights. Spindle appearance showed a strikingly distinctive and reproducible pattern for each individual. There was no first-night effect and little night-to-night variation of spindle appearance rate per night. Eight male adults aged between 19 and 24 years were studied in an evaluation of methaqualone and flunitrazepam by an experimental schedule of 17 consecutive nights. Both drugs caused a significant increase of spindle activity expressed as appearance rate. By using spindle activity as a sleep parameter we could investigate in more detail the characteristics of hypnotics.

Adult↗
PubMed1975

REM phase deprivation and schizophrenia II.

Nine schizophrenic patients with active symptomatology were compared with seven patient controls in their response to two nights of rapid eye movement (REM) sleep deprivation. The control subjects demonstrate "normal" increases in total REM and percentage REM time increase on recovery nights compared to base line nights. The schizophrenic subjects differ substantially from the control subjects in both these measurements and show no perceptible change from base line nights on recovery nights. The effects of medication, anxiety, sleep loss, ceiling effects, and intensity change were not considered adequate to account for the above results. However, many questions, such as the specificity of this rebound failure to the schizophrenic patients and the possibility of a sleep disturbance factor operating independently of psychiatric diagnosis, remain to be answered.

Adult↗