The explanatory model of all motoric movement actions clarifies all perception processes at the functional c.q. the behavioural level within every imaginable motoric action. Ergo it also fully explains how the cortical streams, i.c. the ventral and dorsal stream, are present within the execution of any imaginable motoric action. A previous chapter encompasses the final explanation of how the cortical streams mediate a demarcation process within the visual perception when a incoming ball trajectory shape is involved. Which shows that the demarcation process will have to deal with two autonomous phenomena. The deviations of the ball within the length (y-axis) of an incoming ball trajectory shape leads to a harmonica-process and the deviations of the ball within the width (x-axis) of an incoming ball trajectory shape leads to a zigzag-process. Within this chapter the demarcation process within the auditory perception of spoken words/sounds is compared to the demarcation process within the visual perception of an incoming ball trajectory shape. When approaching sounds/words are involved the exact same phenomena are involved but a definite distinction can be made. Listening is more complex within as well the zigzag-process as well as the harmonica-process.