Sub-frame based apnea detection exploiting delta band power ratio extracted from EEG signals

2016 ◽  
Author(s):  
Celia Shahnaz ◽  
Ahmed Tahseen Minhaz ◽  
Sk. Tanvir Ahamed
Keyword(s):  
Power Ratio ◽  
Eeg Signals ◽  
Band Power ◽  
Delta Band ◽  
Apnea Detection

scholarly journals Low-Frequency Oscillations Are a Biomarker of Injury and Recovery After Stroke

Stroke ◽  
2020 ◽  
Vol 51 (5) ◽  
pp. 1442-1450 ◽  
Author(s):  
Jessica M. Cassidy ◽  
Anirudh Wodeyar ◽  
Jennifer Wu ◽  
Kiranjot Kaur ◽  
Ashley K. Masuda ◽  
...  
Keyword(s):  
Primary Motor Cortex ◽  
Low Frequency ◽  
Inpatient Rehabilitation ◽  
Motor Recovery ◽  
Rehabilitation Facility ◽  
Low Frequency Oscillations ◽  
Band Power ◽  
Interhemispheric Coherence ◽  
Delta Band ◽  
Inpatient Rehabilitation Facility

Background and Purpose— Low-frequency oscillations reflect brain injury but also contribute to normal behaviors. We examined hypotheses relating electroencephalography measures, including low-frequency oscillations, to injury and motor recovery poststroke. Methods— Patients with stroke completed structural neuroimaging, a resting-state electroencephalography recording and clinical testing. A subset admitted to an inpatient rehabilitation facility also underwent serial electroencephalography recordings. The relationship that electroencephalography measures (power and coherence with leads overlying ipsilesional primary motor cortex [iM1]) had with injury and motor status was assessed, focusing on delta (1–3 Hz) and high-beta (20–30 Hz) bands. Results— Across all patients (n=62), larger infarct volume was related to higher delta band power in bilateral hemispheres and to higher delta band coherence between iM1 and bilateral regions. In chronic stroke, higher delta power bilaterally correlated with better motor status. In subacute stroke, higher delta coherence between iM1 and bilateral areas correlated with poorer motor status. These coherence findings were confirmed in serial recordings from 18 patients in an inpatient rehabilitation facility. Here, interhemispheric coherence between leads overlying iM1 and contralesional M1 was elevated at inpatient rehabilitation facility admission compared with healthy controls (n=22), declining to control levels over time. Decreases in interhemispheric coherence between iM1 and contralesional M1 correlated with better motor recovery. Conclusions— Delta band coherence with iM1 related to greater injury and poorer motor status subacutely, while delta band power related to greater injury and better motor status chronically. Low-frequency oscillations reflect both injury and recovery after stroke and may be useful biomarkers in stroke recovery and rehabilitation.

Brainwave sub-band power ratio characteristics in intelligence assessment

2012 ◽  
Author(s):  
A. H. Jahidin ◽  
M. N. Taib ◽  
N. Md Tahir ◽  
M. S. A. Megat Ali ◽  
S. Lias ◽  
...  
Keyword(s):  
Power Ratio ◽  
Band Power ◽  
Intelligence Assessment

Alternation of EEG Characteristics During Transcutaneous Acupoint Electrical Stimulation–Induced Sedation

2020 ◽  
pp. 155005942097630
Author(s):  
Fei Yan ◽  
Dawei Song ◽  
Zhen Dong ◽  
Yun Zhang ◽  
Haidong Wang ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Sedative Effect ◽  
Permutation Entropy ◽  
Functional Connections ◽  
Band Power ◽  
Delta Band ◽  
Significant Difference ◽  
Sedative Effects ◽  
The Difference ◽  
Global Strength

Recent studies have shown that applying acupuncture during general anesthesia can reduce the dosage of anesthetics. Hence, it is speculated that acupuncture may have a sedative effect. However, existing studies employed acupuncture in combination with anesthetics, which makes determine acupuncture’s role in producing sedation difficult. In this work, we investigated the sedative effect of acupuncture by using transcutaneous acupoint electrical stimulation (TAES) at bilateral Zusanli (ST36), Shenmen (HT7) and Sanyinjiao (SP6). Using a cross-over design, 2 separate sessions, that are, the resting and TAES sessions, were conducted for each subject. The sedative effect was quantified by using the bispectral index (BIS). The difference in brain activities between resting and TAES sessions was investigated by analyzing the simultaneously recorded EEG signals. Our results showed that a statistically significant difference in BIS values existed between resting and TAES sessions, which suggested that TAES alone was capable of inducing observable sedation. Using power spectrum analysis, we showed that TAES-induced sedation was accompanied by a reduction in alpha band power and an increment in delta band power. Permutation entropy was lower during the TAES session, which suggested that TAES reduced the complexity of the EEG signal. Moreover, a significant reduction in the global strength of brain functional connections was observed during TAES. These findings suggest that TAES alone can induce observable sedative effects, and this sedation effect is accompanied by changes in brain activities that have shown to be correlated with consciousness.

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