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indeed, thats what made me remember it. This youtube channel does a great job of cutting up his lectures in to byte sized pieces : must see for anyone with an interest in psychology: Peterson seems more rigorous than most in that field. Full lectures here
Edits here (probably easier to browse the ideas, the comment section has a link to the original full lecture)

I am already onto a video about IQ. This guy is speaking my thoughts! Not surprising I suppose when I realise his citations. I am familiar with most of it!