Abstract
AbstractSteady State Visually Evoked Potentials have been known for several decades and they appear in the primary visual cortex of brain as a result of light stimulation of the sense of sight. In this article a simple method for electroencephalographic data acquisition is presented. The system is based on the DSM-51 unit connected to goggles with blinking diodes and Mindset-1000 EEG amplifier with 16 channels. We present self-developed hardware and method of effective synchronization for the light stimulation and brain activity recording.
Highlights
A special case of this phenomenon is the stimulation of the retina by a monotonously modulated light stimulus. It is known as the Steady State Visually Evoked Potentials (SSVEP)
The brightness of RGB LEDs embedded in the goggles was modulated by a sinusoidal signal coming from the digital-to-analog DSM51 converter. 28 frequencies between 3 and 30 Hz in steps of 1 Hz were used
M signal modulating the brightness of RGB LED light - that is a stimulatory signal U was introduced at the input of one of the MS1000 amplifier channels
Summary
Abstract – Steady State Visually Evoked Potentials have been known for several decades and they appear in the primary visual cortex of brain as a result of light stimulation of the sense of sight. A special case of this phenomenon is the stimulation of the retina by a monotonously modulated light stimulus. It is known as the Steady State Visually Evoked Potentials (SSVEP). While examining this phenomenon it is critical to precisely synchronize the stimulus and the analyzed EEG signal [3]. The EEG signal was acquired by means of a Mindset 1000 amplifier (Nolan Computer Systems production) It is a 16-channel device with 16-bit analog-to-digital converter and a software-programmable sampling rate of 64, 128, 256, 512 or 1024 samples per second from each channel [11]. The data acquisition system, as used here, has been described in [13, 14]
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