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Updated: Jan 23, 2026

Testing for Metacognitive Responding Using an Odor-based Delayed Match-to-Sample Test in Rats
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Eliciting Response Bias Within Forced Choice Tests to Detect Random Responders.

Robin Orthey1,2, Aldert Vrij3, Ewout Meijer4

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The Forced Choice Test (FCT) can miss malingering by detecting randomization. A runs test and response bias analysis improve detection of intentional randomization in memory and sensory deficit assessments.

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Area of Science:

  • Neuroscience
  • Psychology
  • Forensic Science

Background:

  • The Forced Choice Test (FCT) is used to detect malingered memory or sensory deficits.
  • Malingered impairment typically results in below-chance performance, but intentional randomization can evade detection.
  • Existing FCT methods may fail to identify malingerers who randomize responses.

Purpose of the Study:

  • To investigate the diagnostic value of a 'runs test' and 'within-test response bias' in detecting intentional randomization during FCT.
  • To improve the accuracy of FCT in identifying malingered deficits.

Main Methods:

  • 73 participants were instructed to malinger red/green blindness and underwent an FCT.
  • Response ambiguity was manipulated for half the participants to elicit response bias.
  • Performance was compared against 10,000 computer-generated genuine performance cases.

Main Results:

  • Both the runs test and response bias analysis demonstrated diagnostic value in detecting malingered performance.
  • These methods were more effective than chance in identifying intentional randomization.
  • The study identified specific statistical markers for malingering.

Conclusions:

  • A runs test and response bias analysis can significantly enhance the detection of malingering in FCT.
  • These statistical approaches offer improved accuracy in identifying individuals who intentionally randomize responses.
  • The findings suggest incorporating these methods into FCT protocols for more robust malingering detection.