Page 76, Neurotoxin INT Damage
If a mental characteristic reaches, make the player roleplay it. The Traveller will be all but brain dead.
This was marked in a document as [Official] for MgT2.
Read the sentence. Does it not appear that there should be a number or range following the word "reaches"?
e.g. A proper answer would be "If a mental characteristics reaches {0, 1, 3-, whatever!, pick one!}, make the player roleplay it. The Traveller will be all but brain dead."
I infer that the missing value might be 0 or 1-. I don't know at what INT level one loses the ability to communicate, but that could be another valid answer.
Mind you, 'brain dead' means a lot less less in a high tech setting than it does in a lower tech setting. You might lose memories, but the raw brain tissue and neuronic pathways could be rebuilt or at least recreated.
Is there an official number or range that could finish off his erratum so that it is usable?