The “primary ABC” focuses on the awareness of the conscious. Learning requires attention. For instance, attention is essential to reject irrelevant sensory stimuli such as anxiety, boredom, and fatigue among others. Conversely, it is the blocking of irrelevant sensory stimuli to facilitate learning. Since the early stages of development are bounded by a stimulus, a child ability to sustain self-directed attention increases at the same time as basic perceptual-motor functions. A balance is achieved between sensory-motor and cognitive processing. It implies that the body acts as a receptor for information where knowledge is expressed. For instance, writing, which is a motor skill, involves the eyes and the hands. Again, speech depends on the control of the lips and the tongue. Therefore, later learning depends on the awareness of the conscious. Overall, the “primary ABC” depends on the attention of the body.