Implicit learning, executive function and hedonic activity in chronic polydrug abusers, currently abstinent polydrug abusers and controls
Addiction, Volume 102 Issue 6 Page 937-946 - June 2007
http://digbig.com/4syxg
Andreas Stevens, Ines Peschk, Jürgen Schwarz
"The findings suggest that current polydrug abusers suffer from impairment of many cognitive functions and from anhedonia. During abstinence, there is near normal cognitive function but still anhedonia. Anhedonia was correlated with implicit learning but not with executive function."
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