Memory systems
Can TMS boost hippocampal network connectivity during remembering?
Open access · cc by · source: Europe PMC
In 32 adults, five days of 20 Hz TMS aimed at a hippocampal-connected parietal site increased posterior-medial connectivity during autobiographical retrieval versus rest, and medial temporal increases predicted better episodic memory.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
The control targets are what make this a network claim rather than a stimulation claim.
Stimulation effects are specific to the targeted network. Targeting the hippocampal posterior-medial network increased its connectivity during retrieval relative to rest, an effect absent when the anterior-temporal network or prefrontal cortex was targeted, and task-dependent medial temporal connectivity predicted improvement on a separate episodic memory test.
Evidence for the claim as stated.
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.
Study at a glance
- Design
- Human experiment — Between-group PMN vs PFC TMS target (n = 16 each) with within-subject real vs sham 20 Hz rTMS; fMRI during rest and autobiographical retrieval
- N
- N=32 · 32 adults analyzed (22 female; mean age 25.6); 16 PMN-targeted, 16 PFC control; two extra discarded for motion
- Population
- Healthy adults 18–34 years with normal vision and no neurological/psychiatric history, eligible for MRI/TMS
- Outcome
- Task-dependent fMRI connectivity in PMN vs ATN and separate episodic memory (item/context) performance
Structured fields used in claim comparison tables when every cited study has a complete layer.
Inspect source passages
Can TMS boost hippocampal network connectivity during remembering?
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
32 adults (22 female; mean age 25.6, range 18–34).
Thirty-two adults participated in the experiment (22 females, mean age = 25.6 years, range = 18–34).
16 PMN-targeted and 16 PFC-targeted participants.
One group of participants (n = 16) received multi-session, high-frequency TMS targeting the PMN via parietal cortex, which is a robust component of the PMN ( Ranganath and Ritchey, 2012 ; Libby et al., 2012 ).
Key findings
PMN-targeted stimulation increased PMN connectivity during retrieval versus rest. The effect was absent in ATN and after PFC-targeted stimulation. Task-dependent MTL connectivity predicted improved performance on a separate episodic memory test.
Methodology
Assigned 16 adults to PMN-targeted parietal TMS and 16 to an out-of-network PFC target. Each completed five daily 20 Hz sessions of real and sham (subthreshold, counterbalanced). fMRI connectivity was compared during autobiographical retrieval versus rest in PMN and ATN.
Limitations
A small healthy-young-adult TMS study cannot show that this protocol treats amnesia or that benefits last beyond the experimental week.
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