Introduction: Current explanations of motivated behavior remain theoretically fragmented across neuroscience, psychology, evolutionary biology, etc. The Proximal Chemical Mandate Principle addresses this fragmentation by proposing that all motivated behavior can be reduced (for unification) to two invariant neurobiological objectives: reward neurochemicals maximization (R↑) (e.g., Dopamine, Opioid , Oxytocin, and more) and/or stress neurochemicals minimization (S↓) (e.g., Norepinephrine, Cortisol, and more).
Methods: We developed this novel theoretical reductionist framework by synthesizing direct evidence from decades of behavioral neuroscience literature, including intracranial self-stimulation, conditioned avoidance paradigms, fiber photometry, and optogenetic studies. The model establishes causal relationships with specific neurochemical signals to motivated behaviors and its ultimate outcome.
Results: Direct experimental evidence demonstrates the following:
Compulsive reward maximization via intracranial self-stimulation, whereby rats repeatedly press levers to stimulate reward pathways despite physiological exhaustion (Olds & Milner, 1954).
Immediate subsecond dopamine encoding of reward value, with nucleus accumbens transients driving motivated action (R↑) within 150–300 ms (Hamid et al., 2021; Mohebi et al., 2024).
Learned stress minimization through conditioned avoidance behaviors (by prediction) that trigger immediately and persist even without immediate threat.
Rapid-onset threat processing via specialized amygdala circuits that detect threats within 120 ms and initiate defensive responses (S↓) within 200 ms (Li et al., 2022).
Real-time instantaneous value–threat integration through prefrontal–striatal circuits that resolve decision conflicts (S↓) within 400–600ms (Zhou et al., 2023).
Conclusions: These findings support a unified novel, testable framework that potentially resolves apparent behavioral paradoxes—including altruism (S↓via altruistic act), addiction (R↑via supernormal stimuli), suicide (S↓), and voluntary childlessness—by demonstrating how identical (R↑,S↓) mandates produce divergent outcomes through contextual implementation. The principle provides testable predictions (if direct mesolimbic dopamine self-stimulation ever stops voluntarily without any other strong environment stimuli, the theory is falsified) for behavioral neuroscience and psychiatry.
Conflicts of interest: None
By framing the love of knowledge within the Natural Culturophiliart Field (NCul-F), the framework posits that intellectual growth and creative expression are "perfect executions" of the mandate.
Important Perspective on Reductionism:
This perspective often seems reductionist, as if explaining complex human behavior through a mandate reduces its richness. However, the goal is not to reduce the complexity of human experience, but to discover a potential underlying mechanism that drives it. A significant challenge for humans is that, even with direct evidence, consensus can be hindered by our own strongly reinforced prior experiences of agency and beliefs about causality.
Ultimately, the framework provides a unified foundation that preserves the significance of human achievement by characterizing it as the sophisticated, inevitable result of a precise neurochemical mandate operating within a complex environment.
Using the thought experiment of Alex and Jamie, we can break down this "demonstration of agency" through the following neural cascade:
The Triggering Stimulus (Cognitive Dissonance): When presented with the argument for determinism, an individual (Jamie) experiences a mismatch between the incoming information and their reinforced self-model of being an "autonomous agent". This mismatch is processed as a prediction error, manifesting as psychological stress or cognitive dissonance.
Subcortical Selection (The Stress-Minimizing Response): Operating under Principle 1, the basal ganglia evaluate potential responses to reduce this rising stress. The motor program for an arbitrary action—like lifting a hand—is selected because it is computed as a tangible strategy to reassert the threatened self-model and thereby minimize the dissonance.
Conscious Experience (The Illusion of Choice): The selected thought ("I will lift my hand to prove my point") is projected to the prefrontal cortex via thalamocortical circuits. Subjectively, the individual experiences this as a conscious, "free" decision, even though the selection was predetermined by the brain's drive to satisfy the mandate.
The Deterministic Outcome: The physical act of lifting the hand is the final output of this rapid neural optimization. It is a "perfect execution" of the mandate within a specific social/intellectual "Field," where the reward is the temporary relief of cognitive tension rather than an act of libertarian choice.
By this logic, the PCM framework suggests that the very feeling of "proving" free will is itself a product of the basal ganglia executing a mandate to maintain a consistent, low-stress internal model.
To address the critique of "explaining everything," the PCM provides specific, testable predictions through the following mechanisms:
1. Neural Circuit Mapping
The framework posits that every behavior is the result of a precise execution cascade:
Basal Ganglia Selection: The striatum selects thoughts and motor programs by calculating a reward-minus-stress optimization function through opponent D1 (Go) and D2 (No-Go) pathways.
PFC Validation: The prefrontal cortex acts as a supervisor, using the hyperdirect pathway to the subthalamic nucleus (STN) to suppress subcortical proposals that violate long-term reinforced schemas.
Thalamic Filtering: The thalamus serves as a contextual hub, filtering sensory information to ensure the selection is appropriate for the current environmental "Field".
2. Clinical Pathophysiology as Falsifiable Proof
The PCM offers high-resolution predictions for clinical conditions like Parkinson’s Disease, moving beyond general descriptions:
Prediction of Akinesia: In low-dopamine states, the model predicts that the perceived stress of movement increases exponentially while reward signals are attenuated. The resulting akinesia is not a "system failure" but a "precise execution" of the mandate where the cost-benefit calculation results in a 'don't move' selection.
Prediction of Paradoxical Kinesia: The model predicts that under acute existential threat, the SAM axis's distress will override baseline calculations. The system recalculates that the stress of remaining stationary (death) is greater than the cost of movement, predicting a sudden, temporary restoration of motor function to minimize dominant stress.
3. Quantitative and Mathematical Potential
The framework transitions from descriptive to predictive by defining behaviors as a Dynamic Optimization Function:
Computational Modeling: Future work involves developing formal models of the R-S (reward-stress) function to quantify how neural optimization processes shift across different environmental fields.
Environmental Field Variables: By categorizing environments (NSF, NCul-F, NCF), the model predicts how identical neurochemical logic will lead to divergent, measurable outcomes—such as the pursuit of Supernormal Stimuli in a mismatched field.
Ultimately, the PCM does not merely describe behavior after the fact; it identifies the specific underlying mechanisms that drive behavior, offering a testable lens for mental health, addiction, and human motivation.
