Intrinsic motivation and false feedback reduce the low prevalence effect.

Area of Science:

• Cognitive Psychology
• Human Factors
• Medical Imaging Analysis

Background:

• The Low Prevalence (LP) Effect describes the tendency to miss rare targets.
• This effect has significant implications for applied tasks, including mammography screening.
• Understanding factors that mitigate the LP effect is crucial for improving diagnostic accuracy.

Purpose of the Study:

• To investigate if feedback and internal incentives can reduce the LP effect.
• To explore the role of motivation in mitigating search errors in low prevalence conditions.
• To assess the impact of different motivational manipulations on target detection in visual search tasks.

Main Methods:

• Five experiments were conducted, manipulating feedback, pledges, and emphasis on medical importance.
• Tasks included a letter visual search and a mammogram search for cancerous lesions.
• Performance metrics included miss errors and false alarm rates.

Main Results:

• False feedback on missed cancers initially reduced miss errors but increased false alarms.
• Signing a pledge reduced the LP effect in a simple visual search but not in mammography.
• Emphasizing medical importance significantly reduced the LP effect in mammography search tasks.

Conclusions:

• Motivational factors play a critical role in modulating the LP effect.
• Simple feedback or pledges may not be sufficient to overcome the LP effect in complex diagnostic tasks.
• Highlighting the significance of the task, such as medical importance, can enhance performance in low prevalence search scenarios.