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A configurable, inexpensive, portable, multi-channel, multi-frequency, multi-chromatic RGB LED system for SSVEP stimulation

Mouli, S. and Palaniappan, Ramaswamy and Sillitoe, I.P. (2015) A configurable, inexpensive, portable, multi-channel, multi-frequency, multi-chromatic RGB LED system for SSVEP stimulation. In: Hassanien, A. and Azar, A., eds. Brain-Computer Interfaces. Intelligent Systems Reference Library . Springer, pp. 241-269. ISBN 978-3-319-10977-0. (doi:10.1007/978-3-319-10978-7_9) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:70685)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
https://doi.org/10.1007/978-3-319-10978-7_9

Abstract

Steady state visual evoked potential (SSVEP) is extensively used in the research of brain-computer interface (BCI) and require a controllable and configurable light source. SSVEP requires appropriate control of visual stimulus parameters, such as flicker frequency, light intensity, multi-frequency light source and multi-spectral compositions. Light emitting diodes (LEDs) are extensively used as a light source as they are energy efficient, low power, multi-chromatic, have higher contrast, and support wider frequency ranges. Here, we present the design of a compact versatile visual stimulus which is capable of producing simultaneous multiple frequency RGB LED flicker suitable for a wide range of SSVEP paradigms. The hardware is based upon the open source Arduino platform and supports on-the-fly reprogramming with easily configurable user interface via USB. The design provides fourteen independent high output channels with customisable output voltages. The flicker frequencies can be easily customised within the frequency range of 5–50 Hz, using a look-up table. The LED flickers are generated with single RGB LEDs which generate the required colour or frequency combinations for combined multi-frequency flicker with variable duty cycle to generate SSVEP. Electroencephalogram (EEG) signals have been successfully recorded from five subjects using the stimulator for different frequencies, colours, duty cycle, intensity and multiple frequency RGB source, thereby demonstrating the high usability, adaptability and flexibility of the stimulator. Finally we discuss the possible improvements to the stimulator which could provide real time user feedback to reduce visual fatigue and so increase the level of user comfort.

Item Type: Book section
DOI/Identification number: 10.1007/978-3-319-10978-7_9
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - Intell. Syst. Ref. Libr. [Field not mapped to EPrints] AD - School of Engineering, University of Wolverhampton, Telford, United Kingdom [Field not mapped to EPrints] AD - School of Computing, University of Kent, Medway, United Kingdom [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints] M3 - Article [Field not mapped to EPrints]
Uncontrolled keywords: Brain-computer interface, Electroencephalogram, LED, Steady-state visual evoked potential
Divisions: Faculties > Sciences > School of Computing
Faculties > Sciences > School of Computing > Data Science
Depositing User: Palaniappan Ramaswamy
Date Deposited: 15 Dec 2018 20:48 UTC
Last Modified: 30 May 2019 08:28 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/70685 (The current URI for this page, for reference purposes)
Palaniappan, Ramaswamy: https://orcid.org/0000-0001-5296-8396
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