The mind can't help but process some amount of environmental information (Flanker Effect). For students who have difficulty with focus, that information can be enough to interfere with their ability to complete the task they are working on. We know that students can be affected by distractors, even without realizing it, so it is important for adults to help them remove distractions even if students might not think they are being affected. (Motor Priming Effect)
Best-suited for students with weaker: Attention, Auditory Processing, Inhibition & Self-Regulation, Sensory Integration (Source: Digital Promise Learner Variability Project)