Hello, there may be some cognitive bias here. There is no most useful method, only a more suitable and targeted training method. Each child's synaesthesia ability is different, and there are individual differences in synaesthesia disorder, which requires the right medicine.

First of all, you need to know which sensory system disorders your child has and the degree of sensory disorders. We can learn about children's sensory integration ability through professional testing in hospitals and evaluation of sensory integration training institutions, and then make corresponding sensory integration training for children's abilities to make up for the differences. Sensory training mainly promotes the good development of children's sensory ability in the form of games and sports, so that children can experience different types of sensory stimuli in play, thus promoting the development of children's vestibular perception, proprioception, vision, touch and hearing.

When training children's sensory integration, they should be based on the actual situation and cannot guess out of thin air. So I suggest you evaluate your child's sensory integration ability first, and then find a training method to solve it.