Final answer:
The first step in the perceptual selectivity process is attention, which precedes other processes such as retention and response in the perceptual and modeling processes.
Step-by-step explanation:
The first step in the perceptual selectivity process is attention. Perceptual selectivity refers to the process by which individuals choose whether or not to attend to specific sensory information that is available at any given time. Perception is how sensory information is organized, interpreted, and consciously experienced. It involves both bottom-up and top-down processing. The correct order of steps in the modeling process, closely related to perception because it underlines how attention is vital before other processes such as retention and response, is 'attention, retention, reproduction, motivation'.