P3b amplitude as a signature of cognitive decline in the older population: An EEG study enhanced by Functional Source Separation

ERPs and topographic maps for the three groups (Young vs. HP vs. LP) on Cz and Fz channels and FSP300. Top Panel (Functional Source Space) - Blue, magenta and red lines indicate FSP3a and green, cyan and brown lines indicate FSP3b for Young, HP and LP groups respectively. Last right column represents the superimposition of the P3a and P3b in the three groups. Bottom Panel (Channel Space) - Grey lines indicate the butterfly representation of all the EEG channels. Blue, magenta and red lines indicate CzP3a selected channel and green, cyan and brown lines indicate FzP3b selected channel for Young, HP and LP groups respectively. The black circle on the topographic map represent Cz and Fz channel positions.277