Common Spatio-Time-Frequency Patterns for Motor Imagery-Based Brain Machine Interfaces

Figure 8

Examples of spatio-time-frequency patterns as the spatial weights, 𝐰₁⁽¹⁾ (top), the amplitude response of the filter, 𝐡₁,…,𝐡₄ (center), and the time windows, 𝐛₁,…,𝐛₄ (bottom), designed by the CSTFP method with various 𝜖 in the result of subject 𝑎𝑣. The vertical axis represents normalized amplitude.

(a) 𝜖=0.04

(b) 𝜖=0.08

(c) 𝜖=0.12

(d) 𝜖=0.16

(e) 𝜖=0.4