[mhartl]

Wikipedia (https://en.wikipedia.org/wiki/N-back) links to a semi-rebuttal:

http://www.sciencedirect.com/science/article/pii/S0160289610...

Naturally, the full article is behind a paywall.

[gwern]

Jaeggi 2010 http://www.gwern.net/DNB%20FAQ#jaeggi-2010 did not address the main criticism of Moody, and administered the tests speeded as in Jaeggi 2008.