A fixed test did not confirm two consistent hippocampal boundary response directions in 15 patients with spikes and 12 fMRI adults

We tested whether two boundary contrasts need more than one consistent spatial direction in the measured human hippocampus. Separate public studies supplied intracranial single-neuron spikes and BOLD fMRI. A local code lock preceded new endpoint scores in 15 retained epilepsy patients and 12 adults. Three people per study supplied development. Four distinct groups enter each spatial area product. Separate clips or runs set the scale. Under independent group errors, a one-map model has expected score zero even when condition gains change by group. Mean signed area was -0.0413845 in spikes and 0.228499 x 10^-6 in fMRI. Their 95% person Student intervals were [-0.118364, 0.0355950] and [-0.743198, 1.200195] x 10^-6. The fixed shared test failed, p=0.865901. Omitting sensory controls gave a positive pointwise MRI interval, which does not replace the primary. Exact independent-error examples gave zero mean corrected area but positive pooled noisy area. Shared group errors and unequal observation filters gave positive scores without two neural sources. One source patient failed the fixed calibration rule because its stored spikes and event clock did not overlap. The contribution is a checked two-study benchmark, compact licensed spike counts, an assay extension and source audits. It does not confirm a positive neural finding across modalities. Separate cohorts, silent clips versus a film with sound, sparse cells, low power, shared stimuli, motion, source filters and unverified group-error independence limit scope. Code, source pins and terms, plans, all results, figures and repeat instructions are preserved.

hippocampus · event boundaries · intracranial spikes · fMRI · measurement error · spatial response rank · open data