For example, I see a tree and my brain generates a unique signal/encoding/storage representing the tree. Another person sees the tree and generates a unique signal/encoding/storage representing the tree. How would my brain communicate "tree" to his brain since both our "trees" are unique to our brains?
My brain device reads my brain signal "1010101" for tree. My friend's device reads brain signal "1011101" for tree. How could we possibly map 1010101 to 1011101. Or is the assumption that human brains have identical signals/encoding for each thought.
The only way I see is by textual or auditory mechanism between people who speak the same language ( standards agreed upon a priori ). But that wouldn't be brain to brain. It would be brain to text/speech to eyes/ears to brain.