Phase 4 age: Which age range is typical for well-developed sensory integration according to Ayres?

• A. 5 to 6 years
• B. 4 to 5 years
• C. 3 to 4 years
• D. 6 to 7 years

Answer: (B)

Phase 4 reflects well-organized, adaptive sensory integration, where a child can smoothly blend tactile, vestibular, proprioceptive, visual, and auditory information to plan and execute actions. By about 4 to 5 years, most children have achieved the level of integration that supports coordinated praxis, steady postural control, and flexible responses to changing sensory environments in play and early school activities. This means they can handle multi-step tasks, manage sensory distractions, and adjust arousal levels as needed. Earlier in development, integration may be developing and variable, with more frequent sensory modulation challenges; later on, skills continue to refine, but the hallmark of phase 4 is reliability of processing across contexts. Therefore, 4 to 5 years is the typical window for well-developed sensory integration according to Ayres.