An experienced tennis player's brain and body respond with skilled accuracy to an oncoming serve before the person becomes consciously aware of the ball's trajectory. This best illustrates the value of

Dual-processing.

Explanation:

According the dual-processing theory in modern psychology, thought arises as a result of two different processes. Unconscious process is implicit and automatic, while conscious process is explicit and controlled.

Let us apply it the experienced tennis player's brain from the example: his or her 'brain and body respond with skilled accuracy to an oncoming serve' (implicit) before 'the person becomes consciously aware of the ball's trajectory' (explicit).

Implicit process occurs with learning and training and is hard to change, that is why it takes an experienced player to have such a reaction.