If ever you were wondering if Sammie can understand or pay attention:
Yesterday, Jason and I were shopping for final Easter Egg hunt supplies.
We discussed several different basket options, and ultimately opted for not getting him a basket since we had no real use for another one and it's not the kind of thing that he would care about anyway...
This morning, Sam goes down to his sensory room and we hear him trying to drag something up the stairs. We didn't think much of it, until Jason went downstairs and found what Sam had left for me on the stair case...Last year's Easter Egg basket. Empty, and ready to be used.
Not speaking is not the same as having nothing to say. Not looking at you is not the same as not paying attention.