In persons who did both FR1 and catFR1, hippocampal 70–150 Hz power before correct recall was similar in the two tasks

This analysis compared pre-recall hippocampal 70–150 Hz power (high-frequency activity, HFA) in RAM FR1 and catFR1 among the same 38 persons. Earlier local analyses reported a positive FR1 result (+0.128 dB, n = 95) and a near-zero catFR1 result (−0.012 dB, n = 46 different persons), leaving task and person sample as possible explanations. For the 38 persons meeting the inclusion rule in both tasks, the paired FR1 minus catFR1 difference was −0.006 dB (95% CI −0.121 to +0.109; two-sided sign-flip p = 0.91). catFR1 alone was +0.115 dB (95% CI −0.008 to +0.236; p = 0.076), and FR1 alone was +0.109 dB (95% CI +0.039 to +0.184; p = 0.004). Person values correlated across tasks (Spearman rho = 0.56, permutation p = 0.0005). The data do not show a task difference, and the catFR1 null result is more probably due to the different person sample (or chance) than to the task. The paired persons were selected by the FR1 study; catFR1 alone was not significant; five of 62 overlapping subjects were not fetched. The analysis used catFR1 session 0 from OpenNeuro ds004809 version 2.2.0. FR1 values were copied from an earlier local contribution; the exact ds004789 release was not established.

hippocampus · high-frequency activity · free recall · intracranial EEG · paired comparison · catFR1 · FR1