Crucially, the overall down-regulation of the brain's reward circuit was verified on the subjective level as subjects reported significantly reduced reward preference after CRT.
In addition, both adults [36] and adolescents [37] with attention-deficit disorder have shown reduced reward-anticipatory activity in the MID task.
Based on a well-validated animal paradigm, the EEfRT operationalized reduced reward 'wanting' as a decreased willingness to choose greater-effort/greater-reward options, particularly when rewards are uncertain.
Reduced reward discrimination and impaired neuronal risk signaling (13 15) are related to maladaptive risk seeking.
Finally, it has recently been shown that depressed individuals show reduced reward responsiveness on a probabilistic reward learning task, and that this deficit is to some extent associated with symptoms of anhedonia (Pizzagalli, Iosifescu, Hallett, Ratner, & Fava, 2009).
Although we found improvements in satiety throughout the day, along with reduced reward-driven eating behavior and snacking in the evening, some of the protein effects of breakfast may have been blunted due to the lunch meal.
Extending this result to PD patients and comparing DAA and levodopa medication effects, van Eimeren et al. found that both medications reduced reward sensitivity in the ventral striatum, but only DAA greatly diminished reward sensitivity in the OFC (van Eimeren et al. 2009).
Credit card companies also often reduce rewards over time.
