The left channel:

corresponds to our past, emotions, desires, affectivity. Its termination
is the superego, which is the storehouse of all our memories, habits and conditionings.

The right channel:

(yellow) corresponds to our
actions and planning, to our physical and mental activity. Its termination is the ego, which gives us the idea of I-ness, the sense that we are
separate from the world.

The central channel:

is the channel of ascent, it is the power which sustains our evolution and guides us,
consciously or unconsciously, towards the higher awareness of the Sahasrara (seventh chakra).