New Hope for Sufferers of Depression

We’ve often heard that depression is a brain disorder, probably caused by low serotonin levels. Along with that, we’ve been taught that it’s best treated by drugs that adjust those neurotransmitter levels.

For those of us who came of age in the 1990s, we were also told that this brain‑dysfunction paradigm of depression would benefit patients. Once they understood that their depression wasn’t due to a character flaw, they would be liberated from shame and blame. Nancy Andreasen’s The Broken Brain of 1984 was a hallmark of this way of thinking.

A new study (Kneeland et al. 2026) upends that received wisdom. The study showed two things. First, the brain dysfunction paradigm can actually lead to worse outcomes for patients. In contrast, what they call the “functional signal” view – the idea that depression is your brain functioning exactly as it should – has superior outcomes.

Secondly, and equally importantly, the researchers showed that there’s nothing inherently harmful about telling people that their depression has a biological cause.

What’s harmful is the suggestion that your brain is somehow broken, rather than working exactly as designed.

A simple experiment

The researchers, led by Elizabeth Kneeland, working with colleagues including Hans Schroder at the University of Michigan’s Department of Psychiatry, first gathered nearly 300 people to take an online questionnaire.

Source: Anna Shvets/Pexels

The participants were split into two groups. Everyone in the study was told about a hypothetical female patient named Alex, who has depression because of an overactive amygdala. They were also shown an fMRI image of an active amygdala.

But then each group was given different information about her case.

Those in the first group were told that the overactive amygdala “is not doing its job” and that this means “something is wrong in your brain right now.”

Those in the second group were told that the overactive amygdala “is doing its job” by signaling that “something in your life is wrong” and that depression is a “helpful signal.”

Same data. Different interpretations.

The results were striking. Those in the first group, who believed Alex had a brain dysfunction, tended to think her depression would last longer, that she had less control over it, and that she would need long‑term treatment. They also thought medication would be more effective than therapy.

Those in the second group, who believed Alex’s depression was a functional signal, tended to think she had a better chance of recovery, more personal control, and less need for long‑term treatment. They were also more likely to believe that therapy would help and medication was not as necessary.

In two additional experiments, the researchers changed the scenarios and the way the information was presented, but the pattern held. For example, in the second experiment, participants were told that Alex’s depression stems from “low serotonin” rather than an “overactive amygdala.” In all three experiments, participants who read that depression was dysfunctional thought that medication would be more effective than therapy.

This shows that, in some ways, our beliefs about depression can become a self‑fulfilling prophecy.

Revisiting the broken brain

As the authors note, many recent studies have shown that the brain-dysfunction paradigm of depression can harm patients. But those earlier studies (such as I’ve described here and here) tended to assume that the problem boils down to presenting a person’s depression as having a biological cause – rather than a psychological or social cause.

Kneeland’s study was the first of its kind to show that there is nothing inherently harmful or stigmatizing about the idea that depression has a biological cause. What’s harmful is the further message that “your brain is broken.”

An evolutionary alternative

But is there any evidence for the idea that depression is actually the brain’s designed signal? Is this a credible position to hold?

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In fact, there is growing evidence for the idea that depression is a functional signal that our needs are not being met (for a recent overview see Rantala and Luoto 2022). Several lines of research in evolutionary psychiatry point in this direction:

• High prevalence and genetic risk. Depression is common across cultures and shows a strong genetic component. When a trait is both widespread and genetic, it often suggests that it served an important purpose in our evolutionary past.
• Sensitivity to social loss. Depression is far more likely to be triggered by social setbacks – a relationship ending, a job loss, a failed project – than by non‑social losses such as losing a home. That makes sense if depression is part of a designed response to threats to status or belonging.
• Clinical experience. Therapists often report that patients do better when depression is framed as a signal about unmet needs. People seem to respond well to the idea that their symptoms are purposeful, not just pathological.

At the same time, evidence for the chemical imbalance theory of depression has crumbled. A recent meta‑analysis showed that there is almost no evidence for the traditional view that depression stems from low brain serotonin.

Perhaps there was a time when telling people that depression is a brain disorder was truly the best way to alleviate stigma and blame.

But now, whatever value that messaging might have had has run its course. This study shows that we urgently need more empowering and optimistic ways of thinking about depression and healing.