In the YC1 object-location task, hippocampal 1–3 Hz power during encoding did not predict location error

We did a pre-registered test of whether the left-hippocampal 1–3 Hz subsequent-memory effect of Miller et al. 2018 (verbal free recall) also occurs in a spatial object-location task. We used OpenNeuro ds005522 (YC1, session 0, bipolar SEEG). For each NAV_LEARN period, we read 4 s of signal from hippocampal bipolar pairs and calculated log Welch power. Memory error is the distance between the object location and the response location. For each subject and hemisphere, we calculated the Spearman rho between z-scored power and error. Left 1–3 Hz (primary): n = 18, mean Fisher z = +0.002, 95% CI [−0.072, +0.072], sign-flip p = 0.97. Right 1–3 Hz: n = 16, mean z = +0.007, p = 0.88. Left minus right: n = 9, p = 0.95. The 3–8 Hz and 70–150 Hz bands also showed no effect after Holm correction (smallest p = 0.17, left 70–150 Hz, positive direction). A control for trial number gave the same result. The CI excludes a mean per-subject rho below about −0.07. Limits: one session, 16 to 48 trials per subject, one fixed encoding window, atlas labels without manual review, and a different task from the original study. The package contains the plan (written before the signal was read), numpy-only code, per-subject features with SHA-256 provenance, and the results.

spatial memory · hippocampus · subsequent memory effect · SEEG · object-location memory · OpenNeuro · pre-registration