Neural oscillations
Can brain stimulation reduce anxiety long-term?
Open access · cc by · source: Europe PMC
Repetitive rhythmic electrical stimulation of the brain's visual areas reduces anxiety and strengthens long-distance brain networks over several days.
How this study connects
Role on claims
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Force, connectivity and symptom scores — no synaptic measurement among them.
Human protocols in this library induce lasting change but measure it downstream. Pairing peripheral stimulation with movement-related cortical potentials raised ankle strength by 7.33 N and voluntary activation by 6.99 percentage points against sham; network-targeted TMS raised retrieval-related connectivity that predicted episodic memory performance; and transcranial alternating current stimulation produced alpha-band connectivity increases that outlasted the sessions alongside a 34% anxiety reduction.
Evidence for the claim as stated.
The cellular and human studies here cannot confirm one another, because they operate at incompatible levels of measurement. A mouse slice study can attribute lasting change to intrinsic excitability by blocking the membrane-resistance change; a human stimulation study recording force, connectivity or symptoms has no way to distinguish a synaptic account from an excitability one.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
The cellular and human studies here cannot confirm one another, because they operate at incompatible levels of measurement. A mouse slice study can attribute lasting change to intrinsic excitability by blocking the membrane-resistance change; a human stimulation study recording force, connectivity or symptoms has no way to distinguish a synaptic account from an excitability one.
Inspect source passages
Can brain stimulation reduce anxiety long-term?
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
0 as the minimum value on the anxiety scale
Participants rated their current state of anxious arousal using a visual analog scale from 0 (not at all) to 100 (extremely), in accordance with standard ratings of subjective units of distress (Wolpe and Lazarus, ).
34% reduction in anxiety
Nonetheless, anxiety reduced by 34% after tACS on Day 1 and maintained throughout the study, resisting the natural regression to the baseline (as seen in the Sham group).
Key findings
Active brain stimulation led to a 34% reduction in anxiety after the first session, which was maintained throughout the study. The stimulation also strengthened directional brain connections in the alpha frequency band, which naturally ranges from 8 to 12 hertz. This connectivity boost remained elevated even 24 hours after previous stimulation sessions, showing long-term benefits.
Methodology
Thirty-eight healthy young adults participated in a study consisting of four sessions, each separated by 24 hours. During these sessions, participants received 30 minutes of active or fake electrical brain stimulation. Researchers measured brain activity and tracked self-reported anxious arousal levels on a scale from 0 to 100.
Limitations
The study only looked at 38 healthy volunteers, meaning we do not know if these results apply to clinical populations. Because the sessions only lasted over four days, it is unclear if the benefits persist weeks later. Additionally, because there was no long-term follow-up after the fourth day, the researchers could not determine when the anxiety-reducing and network-strengthening effects eventually wear off.
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