Philosophical Question

YES, I know it's too early in the morning for those. But a few minutes ago I finished making Little Brother's oatmeal, put the bowl on the table and called him to come eat it.

He was up early this morning and almost immediately dived into the Legos to work on a fairly large-scale creation.

I called him again and said, "Your oatmeal's on the table! Why didn't you come eat it when I called you?"

"You didn't call me," he answered.

"Yes, I did," I told him.

"But I didn't hear you! So you didn't call me...."

So there it is: the philosophical question of the day. If Mom calls, and the boy doesn't hear her, did Mom actually call the boy?