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<v Wren>A vagus stimulation trial beat sham on focus after mental overload.

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<v Ash>62 people got 30 minutes of 25 Hz stimulation through the ear, or a fake version. After heavy cognitive load, the real thing cut their conflict effect and switch cost.

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<v Wren>So less slowdown when cues clash or tasks change. And that matters, because this field mostly runs on vendor claims and open-label pilots, where everyone knows it's real.

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<v Ash>But a systematic review found no real difference from sham for depression, so results depend on the condition.

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<v Wren>And it's one study, so grain of salt. The tracker calls these studies early-stage.

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<v Ash>Credible but narrow, not a verdict change. Full tracker's at DreamLab Research.