Stimulator Selection in SSVEP-Based Spatial Selective Attention Study

Figure 7

The result of PSD of O₁, , and O₂. (a) Averaged PSD in LED mode when subjects noticed 8 Hz; (b) averaged PSD in LCD mode when subjects noticed 8 Hz; (c) averaged PSD in LED mode when subjects noticed 12 Hz; (d) averaged PSD in LCD mode when subjects noticed 12 Hz. A strong frequency component around 10 Hz was observed, which was the interference of nontarget frequency (target frequency: 8 and 12 Hz in this situation). These results may be explained by gray to gray (GTG) and scanning of the monitor and cannot easily be eliminated [15, 19].

(a)

(b)

(c)

(d)