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Possible dysgenic trends in simple visual reaction time performance in the Scottish Twenty-07 cohort: a reanalysis of Deary and Der (2005).
Michael A Woodley, Guy Madison, Bruce G Charlton.
The Mankind Quarterly 2014; 55: 110-124
https://docs.google.com/file/d/0B3-9JKn2PJz3cTNFWHhUbHFXdDg/edit
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This is based on the same data as:
http://iqpersonalitygenius.blogspot.co.uk/2014/03/further-evidence-of-significant-slowing.html
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