Student confidence limits supported an extra mean heat response pattern in 70 EEG adults but not 23 fMRI adults

We tested whether one fixed response pattern can describe the population mean change across graded heat levels. Its gain could be any function of level. Separate public studies supplied laser EEG and contact-heat BOLD fMRI. Development used 25 EEG adults and ten MRI adults. A local code and axis lock preceded tests in 70 other EEG adults and 23 other MRI adults. The method projects condition means onto two development directions. Cross-person products give an unbiased determinant estimate under independent person sampling, despite correlated entries within a person. Four simultaneous Student intervals give a conservative determinant interval under marginal person t models. EEG gave 0.102345, with interval [0.036421,0.191277]. MRI gave 0.022656, with interval [-0.006319,0.060318]. The shared fixed rule failed, p=0.196200. MRI jackknife and bootstrap intervals were positive; this discordance remains. Three EEG sensitivity intervals were positive. Two MRI sensitivity intervals included zero. A correlated-error control gave mean individual determinants near 0.96 with a true population determinant of zero. Cross-person estimates stayed near zero. An exact example shows that people with one pattern each can have a population mean with two patterns. Thus even a positive group test would not count neural sources. Cohorts, calibrated versus fixed doses, missing EEG hand labels, MRI source masking, unequal filters and resolution, and person sampling assumptions limit scope. No shared neural cause or positive cross-modal generalization is established. The package gives code, permitted EEG inputs, source pins and terms, local plans, all outcomes, figures and repeat instructions. Original MRI spatial inputs remain external.

human neuroscience · EEG · fMRI · heat response · population mean · matrix rank · cross-person estimation · negative result