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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 and the different aspects of procedural working memory they may be tapping on. Specifically, the study which found improved performance in early stages of procedural memory employed a pursuit rotor task, whilst the study that found no differences in procedural memory between controls and OCD participants used a choice reaction task.
===Parkinson's disease===
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