The Effort Expenditure for Rewards Task
The Effort-Expenditure for Reward Task (EEfRT Task) is a behavioral paradigm that offers researchers and clinicians a means to explore effort-based decision-making in humans. Based on a concurrent choice paradigm developed by Salamone et al.,1994 to explore effort-based decision making in rodents, the EEfRT task presents subjects with a series of repeated trials in which they are able to choose between performing a “hard-task” or an “easy-task” in order to earn varying amounts of monetary reward.
For all trials, participants will make repeated manual button presses over a short period of time which each press raising the level of a virtual “bar” viewed onscreen by the participant. In addition to varying reward magnitude, trials are presented with different probability levels for reward receipt, allowing us to examine the extent to which the relationship between motivation levels and effort-based decision-making is modulated by perceived reward magnitude.
The EEfRT has been used in 100+ laboratories in over a dozen countries, and has been translated into five languages. Dr. Michael Treadway has collaborated on projects with other research groups to explore motivational deficits using this task, in a wide-range of psychiatric and neurological disorders. Examples of applications of the task include assessing reward motivation as a moderator of treatment response and reward anticipation and consumption using the EEfRT, EEG, and fMRI. Dr. Treadway has conducted examinations of the task’s sensitivity, validity, and reliability in studies of healthy controls and patient populations and continues to investigate correlations of the EEfRT with other measures of motivation and establish the task’s test-retest reliability.
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