Spool is not a wellness app with a vibe. The product is a direct implementation of three lines of peer-reviewed research: affect labeling (naming an urge reduces its intensity), mindfulness and craving (observing an urge breaks the urge-to-action loop), and the welfare economics of digital addiction (brief, well-placed friction produces lasting reductions in use).
This page lists the specific papers each component of Spool draws on, the institutions the work came from, and how the finding maps to a feature in the app. Every paper here is publicly available — links go to the original source.
1. Putting Feelings into Words: Affect Labeling Disrupts Amygdala Activity in Response to Affective Stimuli
Lieberman, M. D., Eisenberger, N. I., Crockett, M. J., Tom, S. M., Pfeifer, J. H., & Way, B. M. (2007). Psychological Science. UCLA Department of Psychology.
DOI: 10.1111/j.1467-9280.2007.01916.x
What the paper showed
fMRI evidence that putting a feeling into words reduces amygdala activity and engages right ventrolateral prefrontal cortex. Naming the urge changes how the brain processes it — from reactive to deliberative.
How Spool uses it
This is the foundational paper Spool operationalizes. The 5-second voice check-in before opening a distracting app is affect labeling turned into a product. Speaking the urge out loud is what activates the prefrontal pathway documented here.
2. Name it to tame it: a neural framework for affect labeling and emotion regulation
Tabibnia, G. (2025). Neuropsychopharmacology. UC Irvine, School of Social Ecology.
DOI: 10.1038/s41386-025-02297-8
What the paper showed
A 2025 neuroscience synthesis updating the affect-labeling literature. Verbal labeling of an emotional state remains one of the most robust low-effort interventions for down-regulating affect, with 18+ years of replication since the original Lieberman work.
How Spool uses it
Confirms that the mechanism Spool is built on is not a one-off finding. The verbalization-as-regulation pathway has held up across nearly two decades of replication, including in screen-behavior and craving contexts.
3. Mindfulness training for smoking cessation: Moderation of the relationship between craving and cigarette use
Elwafi, H. M., Witkiewitz, K., Mallik, S., Thornhill IV, T. A., & Brewer, J. A. (2013). Drug and Alcohol Dependence. Yale School of Medicine.
DOI: 10.1016/j.drugalcdep.2012.11.015
What the paper showed
Judson Brewer's Yale lab showed that mindfulness training breaks the coupling between craving and the behavior the craving triggers. The urge can still be present, but it no longer mechanically produces the action.
How Spool uses it
Phone reaches behave like cravings. Spool's check-in does not try to eliminate the urge — it interrupts the automatic urge-to-action loop by inserting a moment of conscious naming. Brewer's finding is why that interruption works even when the craving itself is unchanged.
4. Digital Addiction
Allcott, H., Gentzkow, M., & Song, L. (2022). American Economic Review. Stanford University, NYU, University of Illinois Urbana-Champaign.
DOI: 10.1257/aer.20210867
What the paper showed
A welfare-economics framework that formalizes social media as a habit-forming good. Users systematically over-consume and under-estimate their own future use, and brief commitment devices produce lasting reductions even after the device is removed.
How Spool uses it
Spool's voice check-in is exactly the type of brief, well-placed commitment device this paper identifies as effective. The paper provides the economic case for why a 5-second friction can produce lasting behavior change without restricting access.
5. Mindfulness and Behavior Change
Schuman-Olivier, Z., Trombka, M., Lovas, D. A., Brewer, J. A., Vago, D. R., Gawande, R., Dunne, J. P., Lazar, S. W., Loucks, E. B., & Fulwiler, C. (2020). Harvard Review of Psychiatry. Harvard Medical School.
https://pmc.ncbi.nlm.nih.gov/articles/PMC7647439/
What the paper showed
A clinical review synthesizing the mechanisms by which mindfulness-based interventions produce behavior change across substance use, eating, and other compulsive-behavior domains. Identifies "decentering" — observing the urge without acting on it — as a core mechanism.
How Spool uses it
Spool's product loop is "name it, then choose": observe the urge, label it out loud, then decide whether to act. That is decentering implemented as a phone interaction. This review documents the evidence base for that approach across non-screen domains.
What we are not claiming
Citing a paper as the inspiration for a product feature is not the same as claiming the paper's authors endorse the product, or that the product itself has been validated by them. None of the researchers cited above have evaluated Spool. We use their published findings as the design rationale for the mechanism; the responsibility for whether the implementation actually delivers on that mechanism is ours.
What Spool has measured so far
Across 8,000+ recorded voice check-ins captured at the moment of compulsive phone use, approximately 85% of users frame the unlock as a first-person want or need (“I just want to scroll for a bit,” “I just need to check something”). Surfacing those patterns back to the user is what users report drives their behavior change. We treat these as observational findings from product data, not as a clinical study.