A fixed rank test did not confirm shared sound map identity matching across different sites in eight SEEG patients and 28 fMRI adults

We tested whether a person's sound relationship map ranks that person's other repeat above maps from other people. Separate public studies supplied human SEEG high-gamma responses and two fMRI cohorts. Different site sets supplied the two maps. We removed additive sound effects and broad sound-group pair effects. Mean identity rank AUC was 0.54464 in eight patients, 0.68947 in 20 MRI adults and 0.64286 in eight other MRI adults. Chance was 0.5. The conditional 95% person bootstrap ranges were [0.44464,0.65179], [0.61761,0.76637] and [0.52083,0.76012]. Whole-person identity tests gave p=0.15042, 0.00001 and 0.00049603. The one fixed shared claim failed. A SEEG check using all the same sites gave descriptive AUC 0.80357. The new test follows an earlier positive mean-similarity result. We prove that unequal positive quality along one common map gives mean rank AUC exactly 0.5 for every identity assignment. A constructed common latent code with different site mixtures still gave AUC 1.0. Thus the guard does not identify neural individuality. Local plans preceded all new scores. The second MRI study supplies independent acquisition for this endpoint; there is no independent SEEG cohort. Clinical placement, age, source selection on repeats, shared processing, different tissue support and vascular effects limit scope. The package gives code, source pins and terms, all outcomes, uncertainty draws, figures, audits and repeat steps. Original neural arrays remain external.

SEEG · fMRI · auditory cortex · individual differences · representational geometry · identity ranks · negative result · measurement sampling