Multiple Frequency Effects on Human-Brain Based Steady-State Visual Evoked Potential (SSVEP)

Brain-computer Interface (BCI) systems authorize to communicate individual person with neuromuscular destruction. A multi-frequency stimuli based on Steady-state evoked potential (SSVEP) exiting a pragmatic continuous brain responses. Most researches used a unique stimulus frequency, therefore increase the number of stimuli frequency would generate a large number of required targets. Human-brain showed a good evokes responses only in a limited range of stimuli frequencies. This study presents new technique by extracting low/high duty-cycle of visual flicker frequency band to evoked users. The flickers frequency between 2-35 Hz transient the visual evoked potentials with overlap resulting in a steady state response. The proposed design used an ordinary Light-emitting diode (LEDs), which driven by sequences flickering that consist of rhythmic stimulus cycles with fixed duration in between. Comfortable flicker was adopted in a Phase-tagged trigger(PTT). Questionnaire survey embrace offline SSVEPs analyzes that induced by different frequencies and duty-cycle flickers. Due to the amplitude of spectral characteristic of fast Fourier transform (FFT) based SSVEP to achieve a higher response. Indicate dynamics Brain-wave (BW) activities that demonstrate a distinction differences between frequencies which are effects on brain activity.