New Therapy Targets Brain's Reward System to Restore Joy in Depression

Anhedonia increases suicide risk and prolongs severe depression in millions of patients, making this treatment advancement potentially life-saving.
Treatment needs to ask: Is this meaningful? Will it give you joy?
Meuret argues that depression therapy must rebuild positive emotion, not just reduce negative states.

For generations, the treatment of depression has been built around the removal of suffering — yet for the majority of those who live with it, the deepest wound is not pain but the extinction of joy. A clinical trial published in JAMA Network Open now offers evidence that a 15-session therapy called Positive Affect Treatment, developed by researchers at SMU and UCLA, can restore what conventional approaches have long left untouched: the brain's capacity to anticipate, receive, and learn from reward. In doing so, it challenges a foundational assumption of mental health care — that healing means the absence of darkness, rather than the return of light.

  • Anhedonia — the inability to feel pleasure or anticipation — afflicts nearly 90% of people with major depression, yet standard treatments have largely overlooked it, focusing on reducing sadness rather than restoring the capacity for joy.
  • The stakes are not abstract: anhedonia prolongs illness, slows recovery, and is one of the strongest predictors of suicide, making its neglect in treatment a quiet but consequential failure.
  • Positive Affect Treatment directly retrains the brain's reward system through structured exercises — reconnecting patients with meaningful activities, cultivating gratitude, and building habits of savoring — rather than simply targeting negative emotional states.
  • In a randomized trial of 98 adults with severe anhedonia, PAT outperformed conventional negative-affect therapy on overall clinical improvement, with gains holding at one-month follow-up and reductions in both depression and anxiety — despite never directly addressing either.
  • The findings suggest that what patients consciously notice about their own returning capacity for pleasure may matter more than what physiological instruments can detect, pointing toward a more subjective and meaning-centered model of recovery.

When people describe depression, they speak of sadness — the weight, the darkness. But for millions, the cruelest dimension of the illness is something quieter: the disappearance of joy. Not the presence of pain, but the absence of pleasure, anticipation, and the sense that anything is worth doing. This symptom, called anhedonia, touches nearly nine in ten people with major depression. It outlasts sadness, slows recovery, and ranks among the strongest predictors of suicide.

Yet for decades, standard depression treatments have largely ignored it. A new study published in JAMA Network Open argues this has been a fundamental mistake. Researchers at Southern Methodist University and UCLA tested a 15-session therapy called Positive Affect Treatment — PAT — designed not to make patients feel less bad, but to help them feel good again. In a randomized trial of 98 adults with severe anhedonia, depression, and anxiety, PAT produced greater clinical improvements than a conventional therapy targeting negative emotions, with the advantage persisting at one-month follow-up.

Alicia Meuret of SMU's Anxiety and Depression Research Center draws a precise distinction: helplessness and hopelessness are not the same. Helplessness still wants things to change. Hopelessness — the territory of anhedonia — has stopped believing they can. Removing sadness does not restore that belief. PAT works by retraining the brain's reward circuitry through concrete exercises: reconnecting patients with once-meaningful activities, deliberately attending to positive experiences, and building practices of gratitude and loving-kindness.

Researchers tracked nine dimensions of reward sensitivity alongside threat processing, using self-report, behavioral tasks, and physiological measures. Six of the seven self-reported reward and threat measures helped explain patient improvement — while behavioral and physiological instruments showed less predictive power. The implication is striking: what patients consciously notice about their own returning capacity for pleasure may matter more than what instruments can record.

The study's deeper argument is that treatment must ask different questions — not only how to reduce suffering, but whether life feels meaningful, whether joy is possible, whether connection is being rebuilt. If restoring reward processing is central to reducing relapse and suicide risk, then recovery cannot stop at the elimination of darkness. For those who have lost the ability to look forward to anything, the difference between those two goals may be the difference between surviving and living.

When people describe depression, they usually talk about sadness—the weight, the darkness, the inability to get out of bed. But for millions of patients, the cruelest part of the illness is something else entirely: the loss of the ability to feel good. They can function. They can move through their days. But joy, pleasure, anticipation, the sense that something is worth doing—these have simply vanished.

This symptom, called anhedonia, touches nearly nine in ten people with major depression. It lingers even when sadness fades. It makes recovery slower and harder. It is one of the strongest predictors of suicide. Yet for decades, the standard treatments for depression have largely ignored it, focusing instead on reducing negative emotions—as if the absence of pain were the same as the presence of meaning.

A new study published in JAMA Network Open suggests this approach has been backwards. Researchers at Southern Methodist University and UCLA tested a 15-session therapy called Positive Affect Treatment, or PAT, designed not to make people feel less bad, but to help them feel good again. In a randomized trial of 98 adults with severe anhedonia, depression, and anxiety, PAT produced greater improvements in overall clinical status than a conventional therapy aimed at reducing negative emotions. The advantage held at the one-month follow-up. Patients showed significant reductions in both depression and anxiety symptoms—even though the therapy never directly targeted those negative states.

The logic is subtle but important. Alicia Meuret, who leads the Anxiety and Depression Research Center at SMU, describes the distinction this way: helplessness and hopelessness are not the same thing. When you feel helpless, you still want things to change. When you feel hopeless—when you believe nothing will ever change—that is anhedonia. Taking away sadness does not restore that belief. PAT works by retraining the brain's reward system, the neural machinery that lets us anticipate pleasure, experience it, and learn from it. The therapy uses concrete exercises: reconnecting patients with activities that once mattered, deliberately shifting attention toward positive experiences, building habits of gratitude and savoring and loving-kindness.

The researchers measured changes across nine different dimensions of reward sensitivity—how much patients anticipated rewards, how they responded when they received them, how they learned from rewarding events. They also tracked threat processing through self-report, behavioral tasks, and physiological measures. Six of the seven self-reported measures of reward and threat helped explain why patients got better. The behavioral and physiological measures did not show the same predictive power, suggesting that what patients consciously notice about their own capacity for pleasure matters more than what instruments can measure.

Meuret emphasizes that the goal is not simply to add positive feelings on top of existing treatment. It is to ask fundamentally different questions: Is this activity meaningful to you? Will it give you joy or a sense of accomplishment? Does it foster connection? These are not the questions conventional depression therapy typically poses. The implication of the study is that they should be. If improving reward processing is central to reducing suicide risk and preventing relapse—and the data suggest it is—then treatment needs to rebuild the capacity for positive emotion, not just diminish the negative. For millions of people who have lost the ability to look forward to anything, that distinction could be the difference between recovery and a life lived in the gray.

There's a difference between feeling helpless and feeling hopeless. When you feel helpless, you still have the drive to want to change things. When people feel hopeless, they don't believe anything will change.
— Alicia E. Meuret, SMU psychologist
It's not enough to take away the bad. Treatment needs to ask: Is this activity meaningful to you? Will it give you joy or a sense of accomplishment?
— Alicia E. Meuret
The Hearth Conversation Another angle on the story
Inventor

So anhedonia is present in 90% of major depression cases, but most therapies don't address it directly. Why has that been the case for so long?

Model

Depression has been understood primarily as a disorder of negative emotion—sadness, despair, hopelessness. The natural instinct was to build treatments that reduce those states. But anhedonia isn't just the absence of sadness. It's the absence of the capacity to feel good. Those are different problems requiring different solutions.

Inventor

And the new therapy, PAT, works by targeting the reward system instead. Can you walk me through what that actually looks like in a session?

Model

It's concrete and practical. A therapist might ask a patient to identify an activity that once brought them pleasure—gardening, music, time with a friend. Then they work together to re-engage with it, paying close attention to small moments of satisfaction. They practice savoring, gratitude, noticing what's good. It's not positive thinking. It's retraining the brain's ability to register and anticipate reward.

Inventor

The study found that PAT improved both positive and negative symptoms, even though it never directly targeted negativity. That's striking. Why would reducing negative emotion follow from increasing positive emotion?

Model

Because they're not separate systems. When your reward system is working, you have motivation, purpose, reasons to engage. That naturally crowds out hopelessness. You're not just removing the bad—you're rebuilding the capacity to want things, to believe things matter.

Inventor

The study measured reward sensitivity in nine different ways. But only the self-reported measures predicted clinical outcomes. What does that tell us?

Model

It suggests that what matters most is what patients themselves notice and believe about their capacity for pleasure. A brain scan might show activity, but if the person doesn't feel it, doesn't recognize it, it doesn't translate into recovery. The subjective experience is the treatment.

Inventor

And suicide risk—the study mentions that anhedonia is a major predictor of suicidal behavior. How does restoring the capacity for joy reduce that risk?

Model

When someone believes nothing will ever feel good again, suicide can seem rational. Restoring even the possibility of future pleasure, the ability to anticipate something worth living for—that changes the calculation fundamentally.

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