Eliciting Response Bias Within Forced Choice Tests to Detect Random Responders

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.