Cognitive estimation in non-demented Parkinson's disease

Federica Scarpina, Alessandro Mauro, Guido D'Aniello, G Albani, Gianluca Castelnuovo, E Ambiel, Sarah E. MacPherson

Research output: Contribution to journalArticlepeer-review

Abstract

Objective

The Cognitive Estimation Test (CET) is widely used in clinical and research settings to assess the ability to produce reasonable estimates to items that individuals would not know that the exact answer (e.g., “How fast do race horses run?”). We examined the performance of non-demented Parkinson's disease (PD) patients on the CET, because previous studies reported heterogeneous results about possible cognitive estimation impairments in PD. We also examined whether PD patients improve their performance if given the chance to reconsider their initial CET responses.

Methods

Thirty non-demented idiopathic PD patients and 30 healthy controls matched in age, gender and years of education performed the two parallel forms of Italian CET. The estimation scores for initial and final responses as well as the number of times individuals changed their answers were examined. Additional neuropsychological tests, evaluating intellectual, frontal executive, speed of processing, naming and arithmetical abilities, were also administered.

Results

The PD group were not significantly poorer than healthy controls at estimating the answers to items on either CET versions. Moreover, PD patients did not significantly differ in their initial and final responses or number of response changes. Performance on the CET was significantly related to performance on a global measure of executive function, processing speed and arithmetic. However, PD patients were impaired compared to controls on the component involving mainly, but not exclusively, length-related estimations.

Conclusions

Non-demented PD patients have mild impairments in cognitive estimation ability, which may depend on the estimations they are required to provide.
Original languageEnglish
Pages (from-to)381-390
JournalArchives of Clinical Neuropsychology
Volume32
Issue number4
Early online date10 Mar 2017
DOIs
Publication statusPublished - 1 Jun 2017

Keywords

  • Parkinson's disease
  • cognitive estimation
  • cognitive impairments
  • executive function
  • neuropsychological test

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