Object permanence research using toddlers with spinal muscular dystrophy (SMA) found that

Question

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The research found that the time interval between seeing an object and being able to reach for it may impact object permanence responding. This suggests that the ability to reach for the object is an important factor in the development of object permanence, which may be especially relevant for toddlers with SMA who experience motor difficulties. The study did not suggest that children with SMA do not advance beyond the sensorimotor stage or that SMA has no impact on object permanence tasks.

Object Permanence Research Using Toddlers with Spinal Muscular Dystrophy (SMA)