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Fractional Integration and the Dynamics of UK Unemployment [PDF]
This article is concerned with the dynamic behaviour of UK unemployment. However, instead of using traditional approaches based on I(0) stationary or I(1) (integrated and/or cointegrated) models, we use the fractional integration framework.
Luis A. Gil-Alana, S.G. Brian Henry
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Sub-fractional Brownian motion and its relation to occupation times [PDF]
We study a long-range dependence Gaussian process which we call “sub-fractional Brownian motion” (sub-fBm), because it is intermediate between Brownian motion (Bm) and fractional Brownian motion (fBm) in the sense that it has properties analogous to ...
Luis G. Gorostiza +2 more
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Abstract Background Central neuropathies caused by diabetic nephropathy (DN) share similar characteristics. The present study aimed to analyze the changes in brain function of patients with DN based on the kidney–brain axis. Methods The study population consisted of patients with DN and healthy controls (n = 23 per group). Brain resting-state
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Altered Fractional Amplitude of Low-Frequency Fluctuation in Anxious Parkinson’s Disease
Brain Sciences, 2023 Objective: Anxiety symptoms are persistent in Parkinson’s disease (PD), but the underlying neural substrates are still unclear. In the current study, we aimed to explore the underlying neural mechanisms in PD patients with anxiety symptoms. Methods: 42 PD-A patients, 41 PD patients without anxiety symptoms (PD-NA), and 40 healthy controls (HCs) were ...
Miao Jin, Hong Tian, Yingying Hu
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Abnormal fractional Amplitude of Low-Frequency Fluctuation in chronic ketamine users
Psychiatry Research - Neuroimaging, 2022Ketamine has become a major substance of abuse worldwide. Nevertheless, The long-term effects of ketamine use on intrinsic spontaneous neural activity remain unknown.In the present study, rs-fMRI was used to explore whether chronic ketamine use changes the intrinsic spontaneous neural activity, and whether the intrinsic spontaneous neural activity ...
Penghui Cao, Fengchun Wu, Ni Fan
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The relevance of fractional amplitude of low-frequency fluctuation to interference effect [PDF]
Behavioural Brain Research, 2016 Growing evidence has indicated a potential connection between resting-state functional magnetic resonance imaging (RS-fMRI) signal and cognitive performance. However, the relationship between intrinsic neural activity and behavioral interference effect on cognitive control has been poorly understood. In the present study, seventy-eight healthy subjects
Yi-Yuan Tang, Yuqin Deng
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An improved approach to detection of amplitude of low-frequency fluctuation (ALFF) for resting-state fMRI: Fractional ALFF [PDF]
Journal of Neuroscience Methods, 2008 Most of the resting-state functional magnetic resonance imaging (fMRI) studies demonstrated the correlations between spatially distinct brain areas from the perspective of functional connectivity or functional integration. The functional connectivity approaches do not directly provide information of the amplitude of brain activity of each brain region ...
Xi-Nian Zuo, Chaozhe Zhu, Yu-Feng Zang
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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 +7 more
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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 +7 more
openaire +2 more sources