Enabling Wearable Brain Technologies - Methods and Applications

Editorial

10 September 2021

Editorial: Enabling Wearable Brain Technologies - Methods and Applications

Marcin Wozniak

Victor Hugo C. de Albuquerque

and

Adel Said Elmaghraby

1,625 views

1 citations

Editors

Marcin Woźniak

Faculty of Applied Mathematics, Silesian University of Technology

Victor Hugo C. de Albuquerque

University of Fortaleza

Adel Said Elmaghraby

University of Louisville

Impact

Original Research

01 April 2021

Clinical Recognition of Sensory Ataxia and Cerebellar Ataxia

Qing Zhang

, 3 more and

Qammer H. Abbasi

Ataxia is a kind of external characteristics when the human body has poor coordination and balance disorder, it often indicates diseases in certain parts of the body. Many internal factors may causing ataxia; currently, observed external characteristics, combined with Doctor’s personal clinical experience play main roles in diagnosing ataxia. In this situation, different kinds of diseases may be confused, leading to the delay in treatment and recovery. Modern high precision medical instruments would provide better accuracy but the economic cost is a non-negligible factor. In this paper, novel non-contact sensing technique is used to detect and distinguish sensory ataxia and cerebellar ataxia. Firstly, Romberg’s test and gait analysis data are collected by the microwave sensing platform; then, after some preprocessing, some machine learning approaches have been applied to train the models. For Romberg’s test, time domain features are considered, the accuracy of all the three algorithms are higher than 96%; for gait detection, Principal Component Analysis (PCA) is used for dimensionality reduction, and the accuracies of Back Propagation (BP) neural Network, Support Vector Machine (SVM), and Random Forest (RF) are 97.8, 98.9, and 91.1%, respectively.

Experiment scene for Romberg’s test and gait measurement. (A) Romberg’s test measurement and (B) gait measurement.

46,886 views

19 citations

Technologies to assist the blind. (Left) Blind individuals can gain autonomy via a combination of the following fundamental and interlinked factors: rehabilitation services, environment adaptation, and technology. (Right) A model of present and future technologies and therapies to substitute and restore vision. At the bottom of the pyramid are simple devices, or tools, that are currently adopted by blind individuals to meet their fundamental needs. At each level, technologies aim to enable more tasks toward the goal of full vision substitution or full vision restoration. However, due to limitations discussed in this review, the higher the technology or therapy on the pyramid, the greater the obstacles to its application and adoption by blind individuals. ETAs, electronic travel aids; SSDs, sensory substitution devices; UD, universal design.

Review

09 February 2021

Brain-Machine Interfaces to Assist the Blind

Maurice Ptito

, 4 more and

Daniel-Robert Chebat

22,605 views

32 citations

Methods

18 September 2020

Bi-Dimensional Approach Based on Transfer Learning for Alcoholism Pre-disposition Classification via EEG Signals

Hongyi Zhang

, 3 more and

Pedro P. Rebouças Filho

6,283 views

33 citations

Retraction

26 January 2021

Retraction: The Effects of Physical Exercise on Cognition: How Heart Rate Variability Can Predict Cognitive Performances

Frontiers Editorial Office

2,524 views

0 citations

Original Research

31 July 2020

Anti-fatigue Performance in SSVEP-Based Visual Acuity Assessment: A Comparison of Six Stimulus Paradigms

Xiaowei Zheng

, 6 more and

Sicong Zhang

Purpose: The occurrence of mental fatigue when users stare at stimuli is a critical problem in the implementation of steady-state visual evoked potential (SSVEP)-based visual acuity assessment, which may weaken the SSVEP amplitude and signal-to-noise ratio (SNR) and subsequently affect the results of visual acuity assessment. This study aimed to explore the anti-fatigue performance of six stimulus paradigms (reverse vertical sinusoidal gratings, reverse horizontal sinusoidal gratings, reverse vertical square-wave gratings, brief-onset vertical sinusoidal gratings, reversal checkerboards, and oscillating expansion–contraction concentric rings) in SSVEP acuity assessment.

Methods: Based on four indices of α + θ index, pupil diameter, National Aeronautics and Space Administration Task Load Index (NASA-TLX), and amplitude and SNR of SSVEPs, this study quantitatively evaluated mental fatigue in six SSVEP visual attention runs corresponding to six paradigms with 12 subjects.

Results: These indices of mental fatigue showed a good agreement. The results showed that the paradigm of motion expansion–contraction concentric rings had a superior anti-fatigue efficacy than the other five paradigms of conventional onset mode or pattern reversal mode during prolonged SSVEP experiment. The paradigm of brief-onset mode showed the lowest anti-fatigue efficacy, and the other paradigms of pattern reversal SSVEP paradigms showed a similar anti-fatigue efficacy, which was between motion expansion–contraction mode and onset mode.

Conclusion: This study recommended the paradigm of oscillating expansion–contraction concentric rings as the stimulation paradigm in SSVEP visual acuity because of its superior anti-fatigue efficacy.

7,402 views

32 citations