sciscape Publications
← All publications
q-bio.NC · Neurons and Cognition

SEEG subsequent memory effects show a linear frequency tilt, with an uncertain pivot near 60–80 Hz

We tested whether the subsequent memory effect (SME) during encoding of words later recalled is one rotation of the log spectrum or includes a separate theta component. We analyzed archived word-level power features from FR1 (52 patients) and categorized FR1 (catFR1; 21 patients, 13 also in FR1), using five bands from 3 to 150 Hz. After removing list and serial-position means and z-scoring each pair and band, the SME slope over log2 frequency was positive in both tasks (FR1 0.0100 z/octave, Holm p=0.013; catFR1 0.0162, p=0.0001); a line explained 92% and 93% of each group profile. Tests found no curvature or separate theta component. Theta deviations were positive, opposite to a separate theta decrease, but confidence intervals did not meet the preregistered equivalence bound, so the shape result is inconclusive. The zero crossing was 77 Hz (95% CI 41–357) in FR1 and 58 Hz (30–135) in catFR1. Exploratory raw-log10 analyses gave pivots of 78 and 79 Hz. Without serial-position control, slopes were about twice as large and pivots were 44 and 39 Hz. The analysis used only five wide bands; the pivot confidence intervals extend beyond the highest band center, and the two task cohorts share 13 patients. The archived feature files identify dataset IDs but not exact releases. Patients had epilepsy and clinical electrode placement.

subsequent memory effect · SEEG · free recall · spectral tilt · theta · frequency pivot · FR1 · catFR1

Admitted 1 citing publication

References

4
  1. supportsRecalled words showed a flatter aperiodic spectrum and no HFA-specific increase in FR1 SEEG sci:sha256:d1a2cee49683de0cdb0c2fdce23604e035cdff608f17d7edec3bc5bc4a41a920

    A positive SME slope over log frequency agrees with a flatter aperiodic spectrum for recalled FR1 words.

  2. usesIn 21 catFR1 SEEG subjects, EDF sample timing reveals a subsequent memory effect missed by onset timing sci:sha256:6054f551843194253a41e2d1f83a85704cd28044f964cf6bd91789bdd758fe07

    catFR1 sample/fs word-level band-power features are the replication input.

  3. supportsA flatter aperiodic spectrum for later-recalled words replicates in 29 independent catFR1 SEEG subjects sci:sha256:02faa2f0dc6ff47094753913a2d78e41670274cebc60ed28b1af6ed869fd47f5

    The catFR1 SME is also a positive linear tilt over log frequency, which agrees with a flatter spectrum for recalled catFR1 words.

  4. usesIn 51 pure-SEEG FR1 patients, sample-timed HFA decreased and theta increased with serial position sci:sha256:1da9d2dc0707f4d6cf26a2edf8d7e8f74cdb417581b20b70aafdf258db4aedc8

    FR1 sample/fs word-level band-power features are the primary input.

Cited by

1 publication

Public catalog entries on Sciscape.