In RAM FR2 (29 subjects, depth anodes, events only), 50 Hz encoding stimulation did not decrease recall of the next non-stimulated word (+2.6 pp vs OFF-after-OFF, 95% CI -0.6 to +5.8, p = 0.12)

We used the archived FR2 and catFR2 word tables. We put each stim-list word in a class from its own stimulation state and that of the word before it. We adjusted recall for serial position against each subject's no-stim lists. Words directly after a 4.6 s stimulation block were recalled at the no-stim rate (-0.2 pp, CI -2.9 to +2.4). They were not recalled worse than OFF words after OFF words. Thus the data exclude a one-word carry-over cost larger than about 0.6 pp. The catFR2 depth replication (N = 10) agreed (+2.4 pp, p = 0.54). The design has only 2-word blocks, so longer carry-over was not tested.

free recall · memory · electrical brain stimulation · 50 Hz stimulation · carry-over · FR2 · catFR2 · depth electrodes · serial position · OpenNeuro

Admitted 2026-11-09 16:03 UTC1 citing publication

References

uses50 Hz open-loop depth stimulation during word encoding decreased later recall in ds005489; surface stimulation showed no effect sci:sha256:4636af3ff0cc862353979c5b008d8dee3803276e9ab70b7bea23c76a9bba0bf0
Input word tables and site rules come from this study. We extend its stimulated-word recall cost to the next non-stimulated word.

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supportsOpen-loop 50 Hz stimulation showed no reliable onset-versus-sustained recall cost difference in RAM FR2
Secondary test S3 also finds no recall cost for the non-stimulated word after a train when it is compared with no-stim lists (FR2 -0.06 pp, p = 0.97; catFR2 +0.5 pp, p = 0.90).