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Is the d2 Test of Attention Rasch Scalable? Analysis With the Rasch Poisson Counts Model.

Purya Baghaei1, Hamdollah Ravand2, Mahsa Nadri1

  • 11 English Department, Mashhad Branch, Islamic Azad University, Mashhad, Iran.

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|December 4, 2018
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Summary
This summary is machine-generated.

The d2 test, a common attention measure in Europe, was evaluated using item response theory. Only concentration performance and total canceled characters scores fit the Rasch Poisson Counts Model, indicating good psychometric properties for these attention metrics.

Keywords:
Rasch Poisson Counts Modeld2 testselective attentionsustained attentionvalidity

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Area of Science:

  • Psychology
  • Psychometrics
  • Cognitive Neuroscience

Background:

  • The d2 test is a widely used European measure for attention, visual scanning, and processing speed.
  • Previous validation used factor analysis and correlational methods, but its fit to item response theory (IRT) models was unexplored.

Purpose of the Study:

  • To evaluate the psychometric properties of the d2 test by examining its fit to the Rasch Poisson Counts Model (RPCM).
  • To assess the suitability of different d2 test scoring techniques within an IRT framework.

Main Methods:

  • The study applied the Rasch Poisson Counts Model (RPCM) to six different scoring techniques of the d2 test.
  • Statistical analyses included graphical model checks and likelihood ratio tests to confirm model fit.
  • Differential item functioning (DIF) across sex was assessed.

Main Results:

  • Two scoring techniques, concentration performance scores and total number of characters canceled, demonstrated adequate fit to the RPCM.
  • Individual items of the d2 test generally fit the RPCM.
  • Negligible differential item functioning was observed across sex for the d2 test items.

Conclusions:

  • The concentration performance score and total canceled characters score of the d2 test exhibit favorable psychometric properties according to the RPCM.
  • These findings support the use of these specific d2 test scoring methods in attention and cognitive processing research.