The reflex fires before you've had a chance to think.
A smartphone app built around five-minute exercises has shown measurable results in reducing anxiety and depression symptoms — and, perhaps just as importantly, people actually kept using it.
Researchers at Mass General Brigham developed HabitWorks to address a specific cognitive pattern called interpretation bias: the tendency to read ambiguous situations as threatening or negative. It's a mental habit that sits at the core of many anxiety and depression disorders, quietly shaping how people feel and respond before they've had a chance to think. The app delivers short, game-like exercises designed to interrupt that pattern and gradually retrain how users interpret uncertain situations.
The results of a randomized trial, published in the Journal of Consulting and Clinical Psychology, involved 340 adults spread across 44 states. Half were assigned to use HabitWorks for four weeks; the other half served as a control group, completing self-assessment surveys tracking their symptoms. After one month, the HabitWorks group showed significantly greater improvements in interpretation bias, overall functioning, and mental health symptom severity than the control group.
What made the trial notable wasn't just the symptom data — it was the retention numbers. Digital mental health tools have a well-documented dropout problem: people download them, open them a few times, and move on. HabitWorks bucked that pattern. By the fourth week, 77.8 percent of participants were still actively using the app, and 84.4 percent completed the post-intervention assessment. Those are numbers that most consumer wellness apps would envy, let alone clinical tools.
The team behind HabitWorks built it with that dropout problem explicitly in mind. They worked with an advisory board made up of people who had lived experience with anxiety and depression, designing the app around how people actually use their phones — in short, scattered bursts throughout the day — rather than trying to replicate the structure of a therapy session on a small screen.
Lead author Alexandra Silverman, a clinical investigator in the CARE Laboratory at McLean Hospital, pointed to the five-minute exercise format as central to the app's approach. The goal was something that could slot into a commute, a lunch break, a few minutes before bed — not something that demanded a dedicated block of time that most people struggling with mental health symptoms find hard to carve out.
Senior author Courtney Beard, who directs the CARE Laboratory, framed the broader significance in terms of access. Getting evidence-based mental health treatment in the United States remains genuinely difficult for a large portion of the population. Provider shortages are real. Costs are high. Stigma persists. The digital mental health space has expanded rapidly in response to those gaps, but most available apps have never been rigorously tested — leaving users to sort through a landscape of uncertain quality with little guidance.
HabitWorks was designed to be different: grounded in cognitive science, tested in a controlled trial, and built for the realities of daily life rather than the ideal conditions of a clinical setting. The 340-person study across 44 states suggests it can work at scale, not just in a lab.
The next question is how tools like this fit into a broader mental health system — whether they function as standalone supports, as bridges to formal treatment, or as maintenance tools for people stepping down from therapy. That conversation is still early, but HabitWorks has given researchers something concrete to build on.
Notable Quotes
By providing a simple, game-like exercise through an app, we have shown that we can help individuals gain insight into their thinking patterns in a more accessible and engaging way, that leads to meaningful improvements.— Courtney Beard, PhD, director of the CARE Laboratory at McLean Hospital
Unlike traditional interventions that mimic long therapy sessions, HabitWorks aligns with how people use their phones in short bursts, creating an approach that fits into daily life.— Alexandra Silverman, PhD, lead author and clinical investigator, CARE Laboratory
The Hearth Conversation Another angle on the story
What exactly is interpretation bias, and why does targeting it matter?
It's the habit of defaulting to the worst-case reading of an ambiguous situation — a delayed text, a neutral expression, an unclear comment. For people with anxiety or depression, that default fires constantly, and it shapes mood and behavior in ways they often don't notice.
So the app is trying to retrain that reflex?
Essentially, yes. Short exercises that present ambiguous scenarios and guide users toward more balanced interpretations. Do it enough times, and the theory is that the reflex itself starts to shift.
Why five minutes specifically?
Because that's how people actually use their phones. Long-form digital interventions that mimic therapy sessions tend to get abandoned. Five minutes fits into the gaps in a real day.
The retention numbers stood out to me — nearly 78 percent still using it in week four. Is that unusual?
For a mental health app, yes. Dropout is the norm. The fact that people kept coming back suggests the format was working on a practical level, not just a clinical one.
What's the significance of testing across 44 states?
It means the results aren't just from a narrow, self-selected population near a research hospital. The sample had real geographic spread, which strengthens the case that this could work broadly.
Does this replace therapy?
The researchers aren't claiming that. The more honest framing is that it addresses a gap — the millions of people who can't access formal treatment due to cost, provider shortages, or stigma. It's a tool, not a substitute.
What's the thing to watch for next?
Whether these short-burst, bias-targeting approaches hold up over longer periods, and whether they can be integrated into stepped-care models where they hand off to more intensive treatment when needed.