Parkinson’s breakthrough changes what we know about dopamine

A new study shows dopamine isn’t the brain’s movement “gas pedal” after all. Instead of setting speed or strength, it quietly enables movement in the background, much like oil in an engine. When scientists manipulated dopamine during movement, nothing changed—but restoring baseline dopamine levels made a big difference. The finding could reshape how Parkinson’s disease is treated.

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A new study led by researchers at McGill University is calling into question a long-standing idea about how dopamine influences movement. The findings suggest a shift in how scientists understand Parkinson's disease and how its treatments work.

The research, published in Nature Neuroscience, shows that dopamine does not directly control how fast or how forcefully a person moves, as many experts previously believed. Instead, dopamine appears to provide the basic conditions that allow movement to happen in the first place.

"Our findings suggest we should rethink dopamine's role in movement," said senior author Nicolas Tritsch, Assistant Professor in McGill's Department of Psychiatry and researcher at the Douglas Research Centre. "Restoring dopamine to a normal level may be enough to improve movement. That could simplify how we think about Parkinson's treatment."

Dopamine plays a key role in motor vigor, which refers to the ability to move with speed and strength. In people with Parkinson's disease, the brain cells that produce dopamine gradually break down. This loss leads to hallmark symptoms such as slow movement, tremors, and problems with balance.

Levodopa, the most common treatment for Parkinson's, helps restore movement by increasing dopamine levels in the brain. However, scientists have not fully understood why the drug is so effective. In recent years, improved brain-monitoring tools detected brief spikes of dopamine during movement. These rapid bursts led many researchers to think dopamine directly controlled movement intensity.