Research Article
High-Frequency Vibrating Stimuli Using the Low-Cost Coin-Type Motors for SSSEP-Based BCI
Figure 4
Effect of the attention within the SSSEP amplitude. Each bar indicates the amplitude of attention and inattention to the vibration stimuli at C4: left hand () and C3: right hand (). The numbers in parentheses also present the resonance-like frequencies of and of each subject.