AI Article Synopsis
- The study investigates the role of the sympathetic-adrenal-medullary (SAM) system in self-control and impulsivity, focusing on how salivary alpha-amylase (sAA) levels relate to delay discounting in monetary rewards.
- Participants, consisting of healthy male students, completed assessments on how much they discounted delayed monetary gains while their sAA levels were measured.
- Findings revealed that lower sAA levels correlated with higher impulsivity in intertemporal choices, suggesting that the SAM system plays an important role in self-control decisions.
Article Abstract
Objective: Little is known regarding the role of the sympathetic-adrenal-medullary (SAM) system in self-control and impulsivity in intertemporal choice (delay discounting), although the roles of dopaminergic and serotonergic systems have been extensively examined. This study was aimed to examine the relationships between salivary alpha-amylase (sAA, a non-invasive biological marker of adrenergic/SAM activities) levels and hyperbolic discounting, which is of interest in psychoneuroendocrinology and neuroeconomics.
Methods: We assessed degrees to which delayed monetary gains were discounted (hyperbolic discount rates) in healthy male students. Participants' sAA were also assessed.
Results: We observed negative relationships between sAA and hyperbolic discounting of small, medium, and large monetary gains.
Conclusions: The results indicate that subjects with low sAA are impulsive in intertemporal choice. Implications for the roles of adrenergic and SAM systems in self-control in intertemporal choice are discussed.
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