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To the influence of general slowing and medication on identity‐ and location‐based priming effects in patients with Parkinson's disease
Author(s) -
Troche S. J.,
Trenkwalder C.,
MorelliCanelo M.,
Gibbons H.,
Rammsayer T. H.
Publication year - 2009
Publication title -
journal of neuropsychology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 37
eISSN - 1748-6653
pISSN - 1748-6645
DOI - 10.1348/174866408x306872
Subject(s) - parkinson's disease , priming (agriculture) , psychology , negative priming , disease , identity (music) , medicine , neuroscience , cognition , selective attention , botany , germination , physics , acoustics , biology
Previous studies on inhibitory mechanisms assessed by negative priming (NP) paradigms in patients suffering from Parkinson's disease (PD) have yielded highly ambiguous results. The present study examined two possible reasons for this heterogeneity: general slowing and anti‐Parkinsonian medication. Their effects on identity and location NP and positive priming (PP) were investigated. Twenty medicated PD patients and 20 PD patients after drug withdrawal were compared to 20 sex‐ and age‐matched healthy controls. The influence of PD patients' general slowing on priming effects was statistically controlled. Location NP was found not to be affected by PD, whereas identity NP was reduced in medicated PD patients compared to non‐medicated PD patients and healthy controls. At first, identity and location PP appeared to be enhanced in both PD groups. After controlling for general slowing, however, differences between PD patients and healthy controls disappeared. These findings endorse the notion that uncontrolled effects of both, PD‐related general slowing and anti‐Parkinsonian medication may have contributed to previously conflicting results on priming effects in PD patients.