Analyzing global features of magnetic resonance images in widespread neurodegenerative diseases: new hope to understand brain mechanism and robust neurodegenerative disease diagnosis

Garehdaghi, Farnaz; Sarbaz, Yashar

doi:10.1007/s11517-022-02748-0

Cited by 5 publications

(1 citation statement)

References 39 publications

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“…The accurate and precise results were attained by combining Higuchi's FD and other nonlinear features [54,58]. The combination of Higuchi's FD and CD was employed for better evaluation of muscle fatigue [77], or better differentiation of multilevel emotions [58], breathing rate [78], and disease states in multiple sclerosis, Alzheimer's and Parkinson's disease [79]. Consequently, in this study, both FD and CD were used for better investigation and comparison of tracking dynamics among different tracking tasks.…”

Section: Discussionmentioning

confidence: 99%

A novel stretching and folding characterization method based on geometrical and physiological traits of chaotic and intermittent tracking signals

2023

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The specification of stretching and folding properties, particularly in time series, is of substantial interest. This study is sought to perceive the relationship between stretching and folding and irregular discontinuities in hand motion trajectories during target tracking tasks. In this regard, a new method is proposed based on compiling physiological characteristics and hand motion dynamics' geometrical traits. Thus, five tracking conditions are designed in which participants are instructed to track different target motion patterns. In these experiments, sinusoidal and trapezoidal target movements with frequencies of 0.1 and 0.3 Hz, as well as pseudo-periodic target motion created by summing two sinusoids with frequencies of 0.117 and 0.278 Hz, are used as visual targets. The results illustrate that nonuniform discontinuities are noticeable properties of the hand motion trajectory. Also, the largest Lyapunov exponent, correlation dimension, and fractal dimension corroborate that the tracking attractor is low-dimensional and chaotic. Moreover, the results are compared with the curvature-based method, and its modified version is presented by taking advantage of the proposed method. As a result, through the suggested method, stretching and folding points are well discerned regardless of discontinuities. This method can deal with the systems with intermittency in both times-and state space.

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