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Bringing the Cognitive Estimation Task into the 21st Century: Normative Data on Two New Parallel Forms

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  • Sarah E MacPherson
  • Gabriela Peretti Wagner
  • Patrick Murphy
  • Marco Bozzali
  • Lisa Cipolotti
  • Tim Shallice

Abstract

The Cognitive Estimation Test (CET) is widely used by clinicians and researchers to assess the ability to produce reasonable cognitive estimates. Although several studies have published normative data for versions of the CET, many of the items are now outdated and parallel forms of the test do not exist to allow cognitive estimation abilities to be assessed on more than one occasion. In the present study, we devised two new 9-item parallel forms of the CET. These versions were administered to 184 healthy male and female participants aged 18–79 years with 9–22 years of education. Increasing age and years of education were found to be associated with successful CET performance as well as gender, intellect, naming, arithmetic and semantic memory abilities. To validate that the parallel forms of the CET were sensitive to frontal lobe damage, both versions were administered to 24 patients with frontal lobe lesions and 48 age-, gender- and education-matched controls. The frontal patients’ error scores were significantly higher than the healthy controls on both versions of the task. This study provides normative data for parallel forms of the CET for adults which are also suitable for assessing frontal lobe dysfunction on more than one occasion without practice effects.

Suggested Citation

  • Sarah E MacPherson & Gabriela Peretti Wagner & Patrick Murphy & Marco Bozzali & Lisa Cipolotti & Tim Shallice, 2014. "Bringing the Cognitive Estimation Task into the 21st Century: Normative Data on Two New Parallel Forms," PLOS ONE, Public Library of Science, vol. 9(3), pages 1-9, March.
    • Handle: RePEc:plo:pone00:0092554
    DOI: 10.1371/journal.pone.0092554
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    References listed on IDEAS

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    1. Louis Guttman, 1945. "A basis for analyzing test-retest reliability," Psychometrika, Springer;The Psychometric Society, vol. 10(4), pages 255-282, December.
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