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@tynan
I am not so sure (although, of course, could be wrong).
The brain is an organ like any other, it has evolved over the decades, centuries, millennia. If we go back much much further than 'cavemen' we inevitably reach a stage where IQ is reduced (keep going and it is removed athogether and 'we' are the subject of unconscious response).
If we are to draw a line between us and our most distant ancestors I can see no reason to suddenly suggest a quantized jump in intelligence (rather than a gradual creep forward) around the time of the cavemen (Neanderthals?) - and especially to the extent where this jump put them on a plateau that we now share with them (having the "same IQ as an everyday person now")
They may have had the the same potential for intelligence (brain structure) but that might not be enough to qualify them as actually being as intelligent - but again here without defining what we mean by intelligence the question is a little vague.