Introduction: Current models lack a detailed neurocircuitry account of how acute stress transitions into impulsive action and, subsequently, guilt-driven repair.
Method: We present a novel theoretical model of stress-mediated PFC–Basal Ganglia dysregulation that unfolds within a dynamic environmental context and is critically shaped by the individual's learned history. The process is triggered by salient environmental stimuli, which the amygdala appraises based on past associative learning. This triggers acute anger, activating the SAM/HPA axes and elevating neurochemicals that suppress PFC activity. Because of this reduced PFC activity, the Basal Ganglia cannot receive its critical input for the proper anticipation of consequences. The striatum then chooses an action based primarily on the immediate stimulus due to the lack of integrative PFC input. This decision is further biased by amygdala-driven salience and reinforced behavioral patterns from the individual's past (e.g., a learned tendency toward verbal aggression). As neurochemicals clear and PFC function restores, its renewed projections evaluate the impulsive act against internalized social rules. This mismatch generates guilt, which subsequently biases the striatum toward a reparative action (e.g., apology) informed by learned strategies for social reconciliation.
Results: This model is supported by the following: Pharmacological evidence that high levels of catecholamines impair prefrontal cortex (PFC) cognitive regulation via alpha-1 adrenergic and D1 dopaminergic receptors, a deficit reversed by adrenergic blockade (Arnsten, 2009); connectivity analyses demonstrating decreased functional coupling between the medial PFC and emotion-processing regions (amygdala/striatum) during anger provocation, which correlates with reactive aggression (Klaassens et al., 2018); and neuroimaging studies identifying a distributed neural signature of guilt centered on the dorsomedial PFC and anterior midcingulate cortex, which predicts the motivation for reparative behavior (Yu et al., 2019).
Conclusion: This model offers a comprehensive framework linking acute stress neurochemistry to observable behavioral shifts, potentially informing future experimental designs and therapeutic targets for impulse-related psychopathology.
