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To date, the diagnosis of mild cognitive impairments in PD has been established based on domain\u2010general functions such as executive functions, attention, or working memory. However, specific numerical deficits observed in clinical practice have not yet been systematically investigated. PD\u2010immanent deterioration of domain\u2010general functions and domain\u2010specific numerical areas suggests the mechanisms of both primary and secondary dyscalculia. The current study will systematically investigate basic number processing performance in PD patients for the first time, targeting domain\u2010specific cognitive representations of numerosity and the influence of domain\u2010general factors. The overall sample consists of patients with a diagnosis of PD, according to consensus guidelines, and healthy controls. PD patients will be stratified into patients with normal cognition or mild cognitive impairment (level I\u2010PD\u2010MCI based on cognitive screening). Basic number processing will be assessed using transcoding, number line estimation, and (non)symbolic number magnitude comparison tasks. Discriminant analysis will be employed to assess whether basic number processing tasks can differentiate between a healthy control group and both PD groups. All participants will be subjected to a comprehensive numerical and a neuropsychological test battery, as well as sociodemographic and clinical measures. Study results will give the first broad insight into the extent of basic numerical deficits in different PD patient groups and will help us to understand the underlying mechanisms of the numerical deficits faced by PD patients in daily life.<\/jats:p>","DOI":"10.1002\/jnr.24907","type":"journal-article","created":{"date-parts":[[2021,6,28]],"date-time":"2021-06-28T21:50:06Z","timestamp":1624917006000},"page":"2390-2405","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Deficits in or preservation of basic number processing in Parkinson\u2019s disease? 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