Pressure, Hysteresis, and Experience: A Friction-Theoretic Framework for Clinical Intervention

Abstract

Psychiatry has effective interventions and no agreed principled rule for matching them to patients. This paper offers a candidate organizing account. Clinical phenomena are specified as outcomes of a competition between routes whose repeated resolution deposits trace, so that a state becomes progressively easier to enter and harder to leave — the pattern psychiatry knows as kindling, here located in per-race route-weight deposition rather than in episode counts. Each intervention class is characterised by which computational level it acts on, which yields a candidate matching rule between a patient’s substrate-configuration and the intervention class that addresses it. The account applies the RACE-architecture and hysteretic-trace mechanism of Friction Theory (FT; Pødenphant Lund 2026b, Paper 1) to the human-clinical content of Behavioural Friction Theory (BFT; Pødenphant Lund 2026a, Paper 0). It is a framework-development article, not a clinical-decision-support tool: the contribution is at the substrate-mechanism level, offered as falsifiable predictions to be adjudicated against existing cohort data and read against established clinical constructs. What the framework organizes. The account is offered as a candidate re-description that builds on, and is to be read against, established clinical constructs rather than as a set of empirical discoveries. (1) An outcome-cluster-versus-route-identity reading of diagnostic imprecision, offered alongside — not in place of — the established dimensional programmes (RDoC, HiTOP), as a candidate account of residual within-diagnosis heterogeneity. (2) An intervention-mechanism taxonomy derived from hysteresis-asymmetry, offered as a candidate organizing axis complementary to established intervention classifications. (3) An integrated meta-mechanism relating the intervention mechanism-axis, the reactance-bypass framing-condition, and pharmacology-as-forward-modelling-modulator under a single signal-budget allocation principle. The account also develops trust as a structurally-defined meta-variable, distribution-shape as a candidate fourth diagnostic dimension, and a prevention-over-cure asymmetry that follows from hysteresis once traces have accumulated. It is developed in depth against treatment-resistant depression as a worked exemplar and illustrated across addiction, ADHD, autism-spectrum, PTSD/OCD, specific phobias, and aging, to illustrate its central claim that one machinery, re-parameterised, can organize phenotypes the diagnostic catalogue treats as unrelated. Predictions. Five framework-pivotal falsifiable predictions (whose disconfirmation would force framework-revision), twenty-three supporting predictions, and five negative-prediction conditions, several testable on existing public-access cohort data without new collection — offered as invitations to test. A cross-substrate parallel with reinforcement-learning-from-human-feedback language models illustrates the framework's scope as structural isomorphism, not mechanism identity. Author position and invitation. The author is an independent researcher without clinical credentials. The framework is positioned as hypothesis-and-invitation: the paper specifies what should be tested; clinical translation requires domain-expert collaboration. We make no patient-level recommendations and prescribe no doses. Target venue: Frontiers in Psychiatry — Hypothesis & Theory. Companion papers in the Friction Theory series: Paper 0 (Behavioural Friction Theory): 10.5281/zenodo.19462499 Paper 1 (Friction Theory substrate): 10.5281/zenodo.20012654 Paper 6 (Matched Friction Under Hysteresis): 10.5281/zenodo.20059863 Paper 7 (Forward-Modelling in Bounded Race Substrates): 10.5281/zenodo.20449154 Paper 8b (Compound Race Pathology): 10.5281/zenodo.20059870 Paper 8c (Translational Research-Programme): 10.5281/zenodo.20059872 Paper 8d (Treating the Base, Not the Top): 10.5281/zenodo.20277291 Paper 8E (One Landscape, Many Inputs): 10.5281/zenodo.21470791 Series project page: frictiontheory.org. ORCID: 0009-0000-4724-2427. v4 update (July 2026). This version adds six framework extensions, each after external dual peer-style review of the addition: (§4.5d, §5.8) the self-relation as the mirror-friction computation applied to the self — self-directed boundary-setting as a forward-frame operation, a self-to-interpersonal transfer prediction, and self-compassion as the matched intervention (Gilbert 2014; Kirby et al. 2017); (§4.5e) self-directed downward escape (non-suicidal self-injury / escape offloading) as a false-exit; (§5.0.2b) expectation as a meta-variable, giving placebo and nocebo a substrate reading as expectation-priors that gate effort and commit-convergence, with a biological bridge (opioid / naloxone-reversible; allostatic load) and falsifiable predictions; (§5.0.6) locus-of-leverage — agency sits at race-initiation and between races, not within a running race, unifying the framing-versus-retrieval delivery rule with delay-discounting; and (§2.5) a habit = pressure-immunity corollary (a consolidated route is won before competition and so sits outside the momentary pressure knob's reach). Builds on the v3 revision. v5 (August 2026). This version adds several worked extensions: kindling and clinical staging read as per-race trace deposition rather than episode counts (§6.5); obsessive–compulsive presentations read in control-theoretic terms (§4.5); acupuncture as a worked example of the intervention-mechanism taxonomy (§5.0.3); and GLP-1 receptor agonists read as a decoupled exit whose effect on loss-of-control eating is channel-match-relative, with a stratified durability prediction (§5.0.5). The framework's positioning is clarified throughout: it is offered as a candidate organizing account that builds on established clinical constructs (including the dimensional programmes RDoC and HiTOP) rather than as a set of empirical discoveries; and Friction Theory is described as a mechanism-level framework standing on the sequential-sampling, information-cost, and resource-rational-analysis traditions, with the nesting of Behavioural Friction Theory within it stated as a working hypothesis rather than an established entailment. Companion-paper citations now point to their published records. Editorial pass. Earlier versions remain in the version history.