A High-Resolution LED Stimulator for Steady-State Visual Stimulation: Customizable, Affordable, and Open Source.

Area of Science:

• Neuroscience
• Biomedical Engineering
• Signal Processing

Background:

• Visually evoked steady-state potentials (SSVEPs) are crucial neural signals.
• Accurate visual stimulation is essential for reliable SSVEP generation.
• Existing systems may lack precision, affordability, or modularity.

Purpose of the Study:

• Introduce a novel, open-source LED stimulator for precise steady-state visual stimulation.
• Provide a customizable, modular, and cost-effective solution for SSVEP research.
• Facilitate replication and adaptation of the system for diverse experimental needs.

Main Methods:

• The system is built upon the Teensy 3.2 microcontroller board.
• Utilizes direct digital synthesis and pulse width modulation for LED control.
• Validated through direct light intensity measurements and EEG recording assessments.

Main Results:

• The LED stimulator offers precise control over stimulus frequency, luminance, and phase.
• Demonstrated suitability for generating SSVEPs with desired frequency and phase resolution.
• Performance validated through rigorous experimental testing.

Conclusions:

• The developed LED stimulator is a viable, high-performance tool for SSVEP research.
• Its open-source nature and comprehensive documentation promote accessibility and widespread adoption.
• The system enhances the capabilities of neuroscience experimental setups.