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===Obsessive compulsive disorder===
{{further|topic=obsessive–compulsive disorder|OCD}}
Neuroimaging studies show that [[OCD]] patients perform considerably better on procedural memory tasks because of noticeable over-activation of the striatum brain structures, specifically the frontostriatal circuit. These studies suggest that procedural memory in OCD patients is unusually improved in the early learning stages of procedural memory.<ref>{{cite journal | last1 = Roth | first1 = RM | last2 = Baribeau | first2 = J | last3 = Milovan | first3 = D | last4 = O'Connor | first4 = K | last5 = Todorov | first5 = C | date = Sep 2004 | title = Procedural and declarative memory in obsessive-compulsive disorder | journal = J Int Neuropsychol Soc | volume = 10 | issue = 5| pages = 647–54 | doi=10.1017/s1355617704105018| pmid = 15327712 | s2cid = 29064519 }}</ref> However, another study found that individuals with OCD do not perform significantly different on procedural working memory tasks than healthy controls.<ref name="Shahar 197–204"/>. Differences between the two studies may be due to the different procedural memory tests that were used.
===Parkinson's disease===
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