Final answer:
The exact starting point for the visual Perception Supplemental Test for children under 5 is not provided, but cognitive development benchmarks are considered. Preschool-aged children show advancements in cognitive abilities and fine motor skills.
Step-by-step explanation:
For the visual Perception Supplemental Test, the starting point for a child under 5 years old isn't explicitly stated in the provided material. However, understanding a child's cognitive development at different ages is essential when conducting such assessments. Typically, children's visual and cognitive abilities advance significantly throughout the preschool years (ages 3-5). During this period, they improve in areas such as color recognition, using the Ishihara test for color perception, and demonstrate a keen sense of the world through interactive play. As each age has distinct developmental milestones, the specific starting point of a test may vary depending on the individual child's maturity and ability.
For infants and toddlers, cognitive experiments often involve observing reactions to changes in their environment to gauge their developmental stage, such as understanding object permanence or volume conservation. As they grow, preschool-aged children develop fine motor skills and can engage in activities such as using a tripod grasp to hold a crayon.