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Time-related changes in Conners' CPT-II scores: a replication study.

Laszlo A Erdodi1, Renee Lajiness-O'Neill

  • 1a Department of Psychology, Eastern Michigan University, Ypsilanti, Michigan and Department of Psychiatry , Dartmouth College , Lebanon , New Hampshire.

Applied Neuropsychology. Adult
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Summary

Replicating a prior study, this research found that administration order of the Conners Continuous Performance Test-II (CPT-II) impacts scores, potentially indicating ADHD-related mental fatigue and serving as a diagnostic marker.

Keywords:
ADHDConners' CPT-IIorder effectspsychological assessment

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Area of Science:

  • Neuropsychology
  • Psychological Assessment

Background:

  • The Conners Continuous Performance Test-Second Edition (CPT-II) is widely used for assessing attention and impulsivity.
  • Previous research indicated that the sequence of test administration can influence CPT-II scores.
  • Understanding these order effects is crucial for accurate interpretation of CPT-II results.

Purpose of the Study:

  • To replicate a 2010 study examining the impact of administration sequence on CPT-II scores.
  • To investigate whether order effects in CPT-II performance are present in a university clinic sample.
  • To explore the potential of CPT-II order effects as a diagnostic marker for Attention-Deficit/Hyperactivity Disorder (ADHD).

Main Methods:

  • Participants (N=25) were administered the CPT-II twice on the same day: at the beginning and end of a testing session.
  • Data were analyzed to compare scores between the initial (Time 1) and subsequent (Time 2) administrations.
  • Statistical analyses included t-tests to assess pre-post changes in various CPT-II indices.

Main Results:

  • Overall trends from the original study were observed, though order effects were less pronounced.
  • The Attention-Deficit Hyperactivity Disorder (ADHD) Index score did not show a statistically significant pre-post change.
  • The Neurological Index showed a trend towards impairment at Time 2 (p=.06).
  • A significant increase in T-scores >60 was observed from Time 1 to Time 2 (p<.05), suggesting performance changes over time.

Conclusions:

  • Time-related changes in CPT-II scores are reliable and may be linked to ADHD, potentially due to mental fatigue.
  • Order effects on the CPT-II may serve as an emergent diagnostic marker for ADHD.
  • Further research is warranted to validate CPT-II order effects in ADHD diagnosis.