Thesis

A pilot study toward the development of ERD and SSVEP based hybrid brain computer interface

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Awarding institution
  • University of Strathclyde
Date of award
  • 2015
Thesis identifier
  • T14238
Person Identifier (Local)
  • 201490037
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Abstract
  • Brain-computer interfaces (BCI) are devices that allow for the brain to communicate information to a computer. In situations where a victim of brain trauma or disease has suffered damage causing paralysis or impaired movement, BCIs may be the answer in providing assistance to neurological function. Development of BCIs continues to increase, but literature suggests the next step is the hybrid brain computer interface (hBCI). The simplified concept behind the hBCI is by having two BCIs, in which both signals can be detected simultaneously, creates the situation that if one BCI is to fail to show user intent the other may succeed. Using a non-invasive method such as surface electroencephalogram (sEEG), able to detect signals from brain activity, this pilot study will look into the development of a hBCI combining the modalities of event-related de-synchronisation (ERS) and steady-state visual evoked potentials (SSVEP). The aim of this project is to show the hBCI proposed works, to find where improvements can be made and to identify the synergies of SSVEP and ERD modalities. A duel task experiment was performed on 4 healthy subject, ages 22-35, in which they must look at a flickering LED and move their wrist in the direction corresponding to that LED. Four LEDs are setup about a point, providing intuitive directions for wrist movement, and only one will flicker at any time. Results show that the SSVEP and ERD hBCI can work, but there may be limitations. The main limitation suggested by the results have also been found in other literature and is known as 'dual-task interference'. The cause of dual-task interference hasn't been well documented and only suggested or speculated so far. Future experiments should validate the cause of this dual-task interference in hBCIs.
Resource Type
DOI
Date Created
  • 2015
Former identifier
  • 1248188

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