Results 221 to 230 of about 29,753 (243)

Frequency-dependent alterations in the amplitude of low-frequency fluctuations in social anxiety disorder

Journal of Affective Disorders, 2015
Recent studies on resting-state functional magnetic resonance imaging (fMRI) have found an abnormal temporal correlation between low-frequency oscillations (LFO) in social anxiety disorder (SAD). However, alterations in the amplitudes of these LFO remain unclear.This study included 20 SAD patients and 20 age-, gender-, and education-matched healthy ...
Youxue Zhang, Chunyan Zhu, Heng Chen, Xujun Duan, Fengmei Lu, Meiling Li, Feng Liu, Xujing Ma, Yifeng Wang, Ling Zeng, Wei Zhang, Huafu Chen   +11 more
openaire   +2 more sources

Effect of amplitude fluctuations on the loudness of low-frequency sounds

The Journal of the Acoustical Society of America, 2019
The loudness of two-tone complexes (TTCs) with center frequencies (fc) of 40, 63, 80, and 1000 Hz was matched with that of unmodulated tones (UTs). Frequency differences between the TTC components, corresponding to beat frequencies, fb, were 1, 2, 5, and 12 Hz.
Carlos Jurado, Darío Gordillo, Brian C. Moore   +2 more
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Fractional amplitude of low-frequency fluctuations is disrupted in Alzheimer’s disease with depression

Clinical Neurophysiology, 2017
To explore brain activity in AD with depression (D-AD) based on fractional amplitude of low-frequency fluctuation (fALFF).Twenty-two D-AD and 21 AD without depression patients (nD-AD) were examined by magnetic resonance imaging during resting state. Neuropsychiatric Inventory and Hamilton Depression Rating Scale were employed to assess the severity of ...
Zhongwei, Guo, Xiaozheng, Liu, Jiapeng, Li, Fuquan, Wei, Hongtao, Hou, Xingli, Chen, Xinwei, Li, Wei, Chen   +7 more
openaire   +2 more sources

Fractional amplitude of low-frequency fluctuations of BOLD signal in schizophrenia

2015 23rd Iranian Conference on Electrical Engineering, 2015
Over 1% of the world population suffer from schizophrenia, which is a mental and hereditary disorder. Diagnosis of this disorder is now based mainly on the clinical symptoms. As the first study in Iran, we used magnetic resonance imaging (MRI) technique to study biomarkers of schizophrenia that are detectable in resting state functional MRI (fMRI).
Afsoon Khodaee, Gholam-Ali Hossein-Zadeh, Esmaeil Shahsavand Ananloo   +2 more
openaire   +1 more source

Dynamic alterations of amplitude of low-frequency fluctuations in adolescents with autism spectrum disorder

The Fourth International Symposium on Image Computing and Digital Medicine, 2020
Numerous studies showed autism spectrum disorder (ASD) is a socio-cognitive and neurodevelopmental disorder together with disturbed static brain activity. However, little is known about alterations of dynamic brain activity and its associations with social behavior in ASD.
Changchun He, Xujun Duan, Xinyue Huang, Jinming Xiao, Xiaolong Shan, Huafu Chen   +5 more
openaire   +1 more source

Disrupted amplitude of low-frequency fluctuations and causal connectivity in Parkinson’s disease with apathy

Neuroscience Letters, 2018
Apathy is a common non-motor symptom in Parkinson's disease (PD). We aimed to explore its associated neural substrates changes via amplitude of low-frequency fluctuations (ALFF) and granger causality analysis (GCA). Resting-state functional magnetic resonance imaging (rs-fMRI) scans were performed in 20 PD patients with apathy (PD-A), 22 PD patients ...
Yu-Ting Shen, Jun-Yi Li, Yong-Sheng Yuan, Xi-Xi Wang, Min Wang, Jian-Wei Wang, Hui Zhang, Lin Zhu, Ke-Zhong Zhang   +8 more
openaire   +2 more sources

Amplitude of low-frequency fluctuations in bipolar disorder: A resting state fMRI study

Journal of Affective Disorders, 2014
The spontaneous low frequency fluctuations (LFF) of blood oxygenation level-dependent (BOLD) signal in resting state have been identified as a biological measure of baseline spontaneous activity in the brain. Increasingly, studies of spontaneous resting state functional connectivity have demonstrated neural network abnormalities in bipolar disorder (BD)
Ke, Xu, Hu, Liu, Huanhuan, Li, Yanqing, Tang, Fay, Womer, Xiaowei, Jiang, Kaiyuan, Chen, Yifang, Zhou, Wenyan, Jiang, Xingguang, Luo, Guoguang, Fan, Fei, Wang   +11 more
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Abnormal Amplitude of Low-Frequency Fluctuations of Intrinsic Brain Activity in Alzheimer's Disease

Journal of Alzheimer's Disease, 2014
We used resting-state functional magnetic resonance imaging to measure the amplitude of low-frequency fluctuations (ALFF) of intrinsic brain activity in 23 patients with moderate Alzheimer's disease (AD) and 27 age- and gender-matched healthy controls. Two different frequency bands were analyzed (slow-5:0.01–0.027 Hz; slow-4:0.027–0.073 Hz).
Xuena, Liu, Siqi, Wang, Xinqing, Zhang, Zhiqun, Wang, Xiaojie, Tian, Yong, He   +5 more
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Frequency-Dependent Changes in the Amplitude of Low-Frequency Fluctuations in Mild Cognitive Impairment with Mild Depression

Journal of Alzheimer’s Disease, 2017
Background: Depression is a potential marker of preclinical Alzheimer’s disease (AD). However, little is known about the abnormal characteristics revealed by resting-state functional magnetic resonance imaging (rs-fMRI) in mild cognitive impairment (MCI) subjects with depressive symptoms (MCI-d).
Yuxia, Li, Bin, Jing, Han, Liu, Yifan, Li, Xuan, Gao, Yongqiu, Li, Bin, Mu, Haikuo, Yu, Jinbo, Cheng, Peter B, Barker, Hongxing, Wang, Ying, Han   +11 more
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Dynamic analysis of amplitude of low-frequency fluctuation in children with growth hormone deficiency

Behavioural Brain Research
Growth hormone (GH) affects brain activities and promotes growth and development. GH is a peptide hormone secreted by the anterior pituitary gland and is tied to behavior and cognitive function. Growth hormone deficiency (GHD) is the most common type of pathological short stature in children.
Jurong Ding, Qiang Chen, Yihong Liu, Zhiling Tang, Chenyu Feng, Mei Wang, Zhongxiang Ding   +6 more
openaire   +2 more sources