On multifractals: A non-linear study of actigraphy data

@article{Francca2019OnMA,
  title={On multifractals: A non-linear study of actigraphy data},
  author={Lucas Gabriel Souza Francca and Pedro Montoya and Jos{\'e} Garc{\'i}a Vivas Miranda},
  journal={Physica A: Statistical Mechanics and its Applications},
  year={2019}
}

Figures and Tables from this paper

A non-parametric model: free analysis of actigraphic recordings of acute insomnia patients

TLDR
This work presents a non-parametric method of analysis of actigraphic time series from insomniac patients and healthy age-matched controls that is fully data-driven, reproduces previous results in the context of activity offset delay and extends the concept of acrophase not only to circadian but also for ultradian spectral components.

Assessment of Fractal Characteristics of Locomotor Activity of Geriatric In-Patients With Alzheimer’s Dementia

TLDR
Actigraphic signal characteristics and especially their (deviations from) fractal scaling may be a useful tool for aiding diagnosis, characterization, and monitoring of dementia, however, results may, besides contextual aspects, also substantially depend on specific methodological choices.

Fractal and Multifractal Properties of Electrographic Recordings of Human Brain Activity: Toward Its Use as a Signal Feature for Machine Learning in Clinical Applications

TLDR
Some of the practical challenges of applying fractal geometry to brain dynamics—and as a putative feature for machine learning applications, are highlighted and solutions to enable its wider use in neuroscience are proposed.

Brain response to color stimuli: an EEG study with nonlinear approach.

TLDR
An EEG based neuro-cognitive study on response of brain to different color stimuli and suggests a lower degree of inter and intra lobe correlation while watching the VIBGYOR colors compared to baseline Grey, hinting towards a post processing of visual information.

Multifractal Analysis of Turbulent Thermoacoustic Systems

  • R. I. SujithS. Pawar
  • Physics
    Springer Series in Synergetics
  • 2021

References

SHOWING 1-10 OF 44 REFERENCES

Identifying Multifractality Structure on Postural Sway

TLDR
The degree of multifractality extracted from the data is revealed, and the application of this computational technique attempts to describe the multiple strategies utilized by the motor control in response to static, yet swaying, human body posture.

PhysioBank, PhysioToolkit, and PhysioNet: components of a new research resource for complex physiologic signals.

TLDR
The newly inaugurated Research Resource for Complex Physiologic Signals, which was created under the auspices of the National Center for Research Resources, is intended to stimulate current research and new investigations in the study of cardiovascular and other complex biomedical signals.

Multifractality in human heartbeat dynamics

TLDR
This work reports oneidence for multifractality in a biological dynamical system, the healthy human heartbeat, and shows that the multifractal character and nonlinear properties of the healthy heart rate are encoded in the Fourier phases.

Quantification of scaling exponents and crossover phenomena in nonstationary heartbeat time series.

TLDR
A new method--detrended fluctuation analysis (DFA)--for quantifying this correlation property in non-stationary physiological time series is described and application of this technique shows evidence for a crossover phenomenon associated with a change in short and long-range scaling exponents.

The role of actigraphy in sleep medicine.

TLDR
The validity, reliability and limitations of actigraphy for documenting sleep-wake patterns have been addressed and the use of computer scoring algorithms without controlling for potential artifacts can lead to inaccurate and misleading results.

Nonlinear analysis of EEG signals at different mental states

TLDR
The results show that EEG to become less complex relative to the normal state with a confidence level of more than 85% due to stimulation, which suggests that when the subjects are under sound or reflexologic stimuli, the number of parallel functional processes active in the brain is less and the brain goes to a more relaxed state.

Altered Functional Performance in Patients with Fibromyalgia

TLDR
The data revealed that both gait and balance were severely impaired in FM, and that subjective complaints associated with FM could contribute to functional disability in these patients, suggesting that optimal rehabilitation and fall prevention in fibromyalgia require a comprehensive assessment.

Actigraphy validation with insomnia.

TLDR
Actigraphy proved to be a satisfactory objective measure of sleep on 4 of 5 sleep parameters, but these results are specific to this particular instrument using this particular algorithm and should not be construed as a blanket endorsement of actigraphy for measuring insomnia.

Use of actigraphy for monitoring sleep and activity levels in patients with fibromyalgia and depression.