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6/6 🧵

The brain operates on razor-thin timing windows we're only beginning to map. What looks like one system is actually a precisely choreographed dance of chemicals — and when the timing's off, everything breaks.

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5/6 🧵

The implications are massive: schizophrenia, depression, and Parkinson's all involve dopamine/acetylcholine dysfunction. Understanding this millisecond-level coordination could unlock novel therapeutic targets for these disorders.

4/6 🧵

This explains why Parkinson's (dopamine neuron loss) disrupts both learning and motor control. The coordination between these neurotransmitters is essential for normal brain function.

3/6 🧵

The see-saw effect: When dopamine coincides with reduced acetylcholine, it promotes learning. When it hits during an acetylcholine burst, it predicts movement vigor. Same chemical, opposite functions — all about the timing.

2/6 🧵

Dopamine does double duty: reinforces rewarding behaviors (learning) AND controls movement vigor. Scientists studied rats doing decision-making tasks (finding water rewards via sound cues) while measuring both neurotransmitters in real-time.

1/6 🧵

NYU neuroscientists cracked a decades-old dopamine mystery: timing matters. The difference between learning something new and moving your body? Just tens of milliseconds — literally a blink — in how dopamine and acetylcholine interact.