Complex mesolimbic-frontostriatal dysregulation (CMFD)

This manuscript proposes Complex Mesolimbic-Frontostriatal Dysregulation (CMFD) as a circuit-based nosological framework designed to dismantle and supersede the behavioral construct of ADHD. It argues that the persistent diagnostic confusion between adult ADHD, anhedonic depression, and bipolar type II (grounded in a dysthymic temperament) is not a failure of clinical intuition, but rather the inevitable friction of a falsified taxonomy. By shifting the focus from the surface phenomenology of checklists to the underlying biophysics of neural circuits, CMFD unifies these disparate categories under a shared catecholaminergic substrate. The framework is anchored in four mechanistic pillars: (i) the tonic/phasic dopamine dynamics characterized by Grace, (ii) the D1/α2A prefrontal architecture defined by Arnsten, (iii) the instability of gain within the cortico-striato-thalamo-cortical loops, and the (iv) diencephalospinal A11 pathway as the sensorimotor locus of Restless Legs Syndrome. The argument traces how state regulators — specifically iron-dependent tyrosine hydroxylase activity and sleep-mediated D2/D3 receptor regulation — function as the systemic amplifiers of this dysregulation. In this light, ADHD is revealed as a nosological archaism — a pre-mechanistic approximation that can no longer carry the weight of contemporary Neuroscience. By providing the concrete mechanistic specification that the Research Domain Criteria (RDoC) program identified as necessary but did not itself supply, this paper establishes a clinically actionable therapeutic hierarchy. It is a claim for intellectual priority that replaces the artifacts of behavioral observation with the rigor of a circuit-based dimension, offering a map for a psychiatry that finally moves beyond its own dictionary. Note: This article is derived from the work Psychotropicā Neuroscience, available at: https://lnkd.in/djY7ai3d