Observing your child playing, your mother-in-law asks if she’s been evaluated for ADHD. Your doctor suggests that what you’re seeing could be Sensory Processing Disorder (SPD). Are these two conditions really that similar? What are some of the differences that can help you identify what you’re facing? The Similarities of SPD and ADHD In truth, there are a few outward similarities, and they are the kind that are easily noticeable. Because of that, these two conditions are some