AIM Framework glossary
Decision Hub Integration
Canonical definition
Decision Hub integration is the neural transformation in ventromedial prefrontal cortex (vmPFC) and ventral striatum (VS) that converts unlike motivational inputs from Appetites, Intrinsic Motivation, and Mimetic Desire into a single scalar subjective value signal, enabling unified choice but necessarily discarding source-specific information in the integrated output.
Explanation
Different motivational systems (hypothalamic circuits for A, dopaminergic midbrain for I, mirror neurons and social-comparison circuits for M) activate in distinct brain regions with distinct properties. But to make a single decision ("what do I do next?"), these must be combined into one metric the brain can compare across options. The Decision Hub (vmPFC/VS) acts as the integration hub, producing a unified "this is how much I want X" signal. The Decision Hub's structures span the ventral striatum, which carries this integration, and the dorsolateral (sensorimotor) striatum, which holds the cached-value habit store; the integration itself is the ventral-striatal function. Critically, this integration is a many-to-one map: three different inputs are summed into one Scalar, and every value of that Scalar is produced by many combinations of the three. Source tags ("this wanting came from hunger" vs. "this wanting came from social comparison") are not preserved in the integrated signal because the integration maps many source combinations onto each value of its output. This architectural constraint (not a failure of introspection but a structural feature of the integration mechanism) is the neural foundation of Source Opacity.
Epistemic status
Framework-Specific Construct.