Robot control with SSVEP
Four LEDs, four directions
Define four stimulation frequencies for the LEDs, for example 14, 16, 18 and 20 Hz: avoiding the alpha band and frequencies that are multiples of each other is recommended. g.HIsys collects EEG from electrodes over the visual cortex and analyses the SSVEP signals; after calibration the four LEDs move the robot forward, back, left and right. For a VEP experiment, a strobe light on a digital output gives an exact trigger between the EEG and the flash.
- 4 stimulation frequencies
- g.HIsys
- VEP experiments
g.SSVEPbox
Visual stimulation for SSVEP studies
g.SSVEPbox is a visual stimulation device that connects to the digital outputs of g.STIMbox. Four ultra-bright, dimmable LEDs give precise stimulation, and four small LEDs show the active target. Flicker frequencies are set with the g.STIMbox MATLAB API; with a Simulink paradigm, training mode shows the target, and in real-time control the user selects an LED by fixing their gaze on it.
- 4 ultra-bright LEDs
- MATLAB API
- Simulink paradigm
Accessories
Push button, LED box and g.VIBROstim
Small devices on single cinch connectors cover the basics: push buttons on the input channels pass subjects' responses to the recording system, and single LED boxes on the output channels provide visual stimulation. g.VIBROstim is a compact vibrotactile stimulator fixed to the limbs or trunk with Velcro or adhesive tape, for short tactile stimulation in research.
- Push button
- Single LED box
- g.VIBROstim
