The Upgrade Tree

The branches · Mood and drive · could move a stage within 1 to 5 years

A brain implant lifts severe depression

First human

Electrodes placed deep in the brain and driven by a pacemaker-like unit in the chest, the same hardware used for Parkinson's disease, aimed instead at a region that is overactive in depression. In the first six patients, four whose depression had resisted everything else got markedly better, and some described the change in the operating room. Later, larger trials were mixed, and twenty years on no regulator has approved it. It is a first human that has stayed one.

What would count

A person with severe depression that has not responded to standard treatment improves by a clinically meaningful amount on a standard depression scale with an implanted brain stimulator switched on, in a peer-reviewed report; the rung above needs a regulator's approval for this use.

Who settles it: Peer-reviewed reports of the implanted patients; the regulator's approval record if it comes

Where it stands

First human. Reached on 3 March 2005, on the record of doi.org. Could move a stage within 1 to 5 years.

The last reading

Once a week every upgrade is read against the news, against what would count above. Open a line to see what that week held. Every reading of this upgrade is on this week's reading.

  • 16 October 2026 Nothing new

    Nothing in the window. Abbott's pivotal TRANSCEND trial of deep brain stimulation for depression (about a hundred participants, begun September 2024) has reported no result, and the FDA cleared Motif Neurotech's small skull-mounted stimulator for a first-in-human trial in April 2026, which is a trial and not an approval. The January 2026 vagus-nerve result is a chest implant and sits outside this entry's test.

Notes

The record is the 2005 Toronto report of deep brain stimulation of the subgenual cingulate in six people. Stimulation of a nerve in the neck (vagus nerve stimulation) was approved for depression in the United States in 2005, but it is not an implant in the brain and sits outside this entry's test. A device maker holds a breakthrough designation from the FDA for depression, which is not an approval.