Do "effort tests" really test effort?

Area of Science:

• Cognitive Psychology
• Neuroscience
• Behavioral Economics

Background:

• Cognitive effort is crucial for performance on cognitive tests.
• Understanding and measuring cognitive effort is challenging.
• Previous methods lack sensitivity in detecting subtle variations in effort.

Purpose of the Study:

• To introduce and validate an experimental paradigm for manipulating and measuring cognitive effort.
• To investigate the relationship between incentives and cognitive effort.
• To identify reliable markers of low cognitive effort.

Main Methods:

• 38 participants were assigned to either a standard incentive (SI) or enhanced incentive (EI) condition.
• Cognitive performance and performance validity testing (PVT) were assessed at baseline and follow-up.
• EI participants received a bonus based on performance improvement, while SI participants received a chance-based bonus.

Main Results:

• The EI group demonstrated significantly greater improvements in cognitive test performance compared to the SI group.
• Participants in the EI group reported and were rated as exerting higher effort.
• While standard PVT measures did not correlate with low baseline effort, physical indicators like resting one's head or slouching did.

Conclusions:

• The developed paradigm offers a promising approach to manipulate and study cognitive effort.
• Standard PVTs are effective for detecting malingered cognitive impairment but not subtle variations in cognitive effort.
• Further research is needed to fully understand the nuances of cognitive effort and its measurement.