One of the basic principles of neuroscience is that structure determines function. The physical parameters that differentiate between the living human brain and the fixed, post-mortem human brain have not been explored thoroughly. Once the human brain is removed and fixed, it is assumed to be “dead” and without the potential for dynamic properties. Recent technologies have allowed, for the first time, access to quantitative measures of sufficient density to assess these potential differences    . In most sciences, the contribution of a process or experimental manipulation requires a reference (a “control” group). We designed an experiment that would produce relatively artifact-free quantitative differences between the intrinsic electroencephalographic properties of a representative fixed human brain and those obtained from a representative living brain.
Historically, the aggregate or field of electromagnetic patterns and the mosaic of chemical processes that define or can be employed to describe the living brain and its properties have not measured the quantitative differences between living and dead states from a holistic perspective. However, if one approaches the problem in a manner similar to the measurement of spontaneous photons where the actual measurements are subtracted from the dark counts that define the intrinsic circuitry of the photomultiplier unit  , then the actual increments of dynamic energy can be inferred. Here we demonstrate for the first time in the published literature that differences in potentials over the 1 Hz successive increments of the contemporary quantitative electroencephalography (QEEG) between a living and a dead human brain reveal a quantity of energy that might be central to the understanding of the universal values that define “living and consciousness”. These quantities may have philosophical significance as well as application to the synthetic creation of simulated or virtual living and consciousness states.
The aim of the study was to investigate the frequency-dependent electric potential differences (µV) between gyri of a post-mortem, chemically fixed human brain and its basilar artery. Needle-electrodes were inserted into all major gyri of a post-mortem human brain. Power densities (PDs) were measured in μV2・Hz−1 and compared to equivalent measures from the QEEG of a living brain. Relatively equal PDs as a function of frequency defines white noise. The measurements presented here are unevenly distributed across frequency bands and respond dynamically to applications of stimuli  .
2.1. Fixed Human Brain Specimen
A human brain that had been maintained in ethanol-formalin-acetic acid for over 20 years was selected from a collection of specimens held within the Neuroanatomy Laboratory at Laurentian University. The brain was acquired from an anonymous donor through North Carolina Biological Supplies and its use was approved by the University ethics board. The full, unsectioned brain featured an intact brain stem, a complete cerebellum, and partially preserved vasculature. Major neuroanatomical features including typical fissures and lobular demarcations were well preserved. All of the major cerebral gyri and sulci outlined by Crosby, Humphrey, and Lauer  were apparent. For the purposes of the study, only gyri which could be probed by the unimpeded insertion of a needle electrode (n = 52) were included in the analysis. Gyri of the human cerebrum can extend over considerable spatial distances. In this experiment probes were only inserted into one point along a given gyrus. The fixed human brain, for the purposes of simplicity, was labelled the “Non-Living” and the person’s brain was labelled “Living”.
2.2. Measurement Device
A Mitsar 201 amplifier unit, typically used in quantitative electroencephalography, was coupled to five needle-electrodes. Four of the probes, which were inserted into the basilar artery of the human brain fixed in EFA, collectively served as the electrical reference point. The remaining probe was inserted serially into most gyri over the surface of the human brain. Electric potential differences (µV) were obtained and subsequently converted to spectral power densities (µV2・Hz−1) within SPSS v19 for segmentation into discrete bands: delta (1.5 Hz - 4 Hz), theta (4 Hz - 7.5 Hz), alpha (7.5 Hz - 14 Hz), beta1 (14 Hz - 20 Hz), beta2 (20 Hz - 30 Hz), and gamma (30 Hz - 40 Hz). The device was set to measure with a sampling rate of 250 Hz. Low- (1.5 Hz) and high-cut (50 Hz) filters were applied to reduce extraneous sources of electrical noise. An additional notch filter was applied to remove 60 Hz electrical artifacts.
2.3. Human QEEG Reference Point
QEEG data extracted from the brain of a living human participant was used as a reference point for the analysis. The case was selected from a database of QEEG profiles containing hundreds of individuals’ electroencephalograms  which were collected by the Neuroscience Research Group at Laurentian University. This Living brain met criteria which indicated that it was representative of the database. The mean normalized (z-scored) power densities within all bands during QEEG recordings while the subject’s eyes were closed did not exceed z = 2.00. There was no reported history of head injury or neuropathology. QEEG channels for the Living brain were those typically associated with the 10 - 20 International system of electrode placement. However, only channels which were situated over gyri which were probed within the Non-Living brain were retained for the analysis. The pairs are not perfectly superimposed in space, though their positions are proximal to within <1 cm.
Non-Living brain measurements consisted of 30 second recordings of raw microvolt potentials. Each measurement was preceded by a surface primer application of 10% EFA to prevent tissue from drying. Raw potentials were extracted and transferred to SPSS v19 for subsequent processing. Signals were z-transformed and spectral analyzed. Data were then segmented into frequency bins.
In addition to simple tests of differences between the magnitude of band-specific PDs between the Non-Living human brain and the Living brain, two other analyses were employed. The first analysis involved dimensional reduction. Factor analyses with varimax rotation were explored by loadings of all gyrus- (Non-Living) and channel- sourced (Living) PD profile time series. With maximum iterations set to 25, the factor analyses were performed within each QEEG band (i.e. delta, theta, alpha, beta1, beta2, and gamma). These analyses facilitated plotting of the numbers of factors which cumulatively explained the most amount of variance within each frequency band for both the Non-Living and Living brains.
The second analysis involved correlating time-independent, band-specific PDs obtained over left and right hemispheric homologous areas. Living and Non-Living brain data obtained at different times (T1 and T2) were extracted for contralateral pairs of channels and needle-electrodes. Data were normalized by z-transformation and spectral analysed. Power profiles for contralateral pairs of channels (Living) and needle-elec- trodes (Non-Living) were correlated within typical QEEG frequency bands (i.e. delta, theta, alpha, beta1, beta2, and gamma) as well as low- and high-frequency case-cont- rolled (n = 254) band ranges (i.e. 1.5 Hz - 10 Hz and 31.5 Hz - 40Hz). We reasoned that strong correlations would indicate time-independent PD profile parity for contralateral pairs. This is an implicit measure of PD stability between hemispheric homologues over time. Alternatively, any reliable strong correlation between time-independent PD profiles for contralateral pairs could be considered as an indicator of high signal redundancy for the paired structures being directly probed or over which QEEG channels were positioned.
Increased power densities (μV2・Hz−1) within all frequency bands were observed in the Living brain relative to those obtained within the needle-probed Non-Living brain with effect sizes (r2) ranging between 0.26 and 0.90 (Figure 1A). On the other hand, within the delta-band (1.5 Hz - 4 Hz) PDs of equivalent amplitudes were observed when parieto-occipital sources for Living (i.e. O1, O2, P3, and P4) and Non-Living (i.e. left and right occipital poles and superior parietal lobules) brains [t (6) = −1.10, p = 0.31] were compared as shown in Figure 1B. These differences indicate that measurements obtained within the Living and Non-Living brains could be effectively discriminated based upon frequency-dependent signal amplitudes. The exception was the caudal aggregates. The primary sources of variance were differences within theta, alpha, and beta1 bands.
When brain-surface-matched PD sources (e.g. Fp1 and the left superior frontal gyrus) were extracted into separate factor analyses for the Living and Non-Living brain, the resulting dimensional reduction profiles revealed a major distinction. The Living brain PD sources underwent less, relatively frequency-independent dimensional reduction as compared to the Non-Living brain (Figure 2A). In contrast, the Non-Living brain expressed frequency-dependent dimensional reduction magnitudes where higher frequency PDs were associated with increased dimensions. When all PD sources or
Figure 1. Living (light) and non-living (dark) PD differences as a function of frequency band for an aggregate of all channel-electrode matched measurements (A) as well as delta-band PDs for lobular aggregates (B).
Figure 2. Living (squares) and non-living (circles) channel-electrode matched PD source (n = 14) factors within all frequency bands (A) as well as non-living PD source factors for all probed gyri (n = 52) within all frequency bands (B).
gyri (n = 52) were entered into the factor analysis, a conspicuous, strong positive relationship emerged between frequency and factors (r = 0.95, p < 0.005, rho = 0.93, p < 0.01), which is presented in Figure 2B.
To eliminate the confounding factor of cases associated with each frequency band, factor analyses were performed within the 1.5 Hz - 10 Hz, 16.5 Hz - 25 Hz, and 31.5 Hz - 40 Hz. The three band ranges were case-matched (n = 254). They generated 4, 13, and 16 factors, respectively. This supported the anticipated positive relationship. These results suggest that for the Non-Living human brain, more factors were required to satisfy classification of PD sources at higher relative to lower frequencies-which points to greater spatially independent signal spectra as frequency increases. The gyri of the Non-Living brain displayed less spectral overlap with other gyri at higher frequencies within magnitudes comparable to the Living brain. Stated alternatively, the Living Brain exhibited more spectral coherence within the higher electroencephalographic frequencies over larger (more integrative) cerebral areas.
The low-frequency (1.5 Hz - 10 Hz) case-controlled band range demonstrated increased correlations relative to the high-frequency (31.5 Hz - 40 Hz) range for both Living and Non-Living brains. However, correlations for the Living brain were (in a majority of cases) significantly weaker than those associated with the Non-Living brain when low-frequencies (Fz > 1.96, p < 0.001) were examined. One conspicuous overlapping feature consisted of clusters of strong correlations (r > 0.80, p < 0.05) centering upon the fronto-temporal operculum for both the Living and Non-Living low-freq- uency bands. They were eliminated (r ≃ 0) at higher frequencies. It was apparent that the Living brain was subject to incidences of non-correlation over spatially diffuse regions within the high-frequency band (Figure 3). In contrast, the Non-Living brain expressed primarily fronto-temporal incidences of non-correlation (Figure 4). These representational maps suggest some gross overlap of time-independent PD profiles for
Figure 3. Representational maps of time-independent PD correlations (pearson r) between contralateral homologous sensor pairs in a living human brain for the 1.5Hz - 10 Hz and 31.5 Hz - 40 Hz bands. Non-correlations (p > 0.05) are indicated by black markers with white borders.
Figure 4. Representational maps of time-independent PD correlations (pearson r) between contralateral homologous sensor pairs in a non-living human brain for the 1.5 Hz - 10 Hz and 31.5 Hz - 40 Hz bands. Non-correlations (p>0.05) are indicated by black markers with white borders.
paired sensors across hemispheres. Both the Living and Non-Living brains shared a degree of spatially clustered signal stability which was contingent, in both cases, upon frequency.
The employment of a single test case representative of one population (a dead brain) compared to a case that is representative of another population (a living brain) might be considered anecdotal. However, this would not be the first instance in the history of neuroscience where a single case is representative. Classic examples include Broca’s patient who demonstrated expressive aphasia and Alzheimer’s female patient who exhibited the presenile manifestations of dementia. We suggest that the specific nature of the quantitative differences in power densities over different regions of the cerebrum and frequency bands in the present study may represent a real phenomenon separate and distinct from noise.
One of the advantages of physical sciences and quantitative measurements is that values can be obtained that reflect the phenomenon being studied. When the differences between the total power (μV2・Hz−1) for the Living and Non-Living (dead) brain were obtained, a significant energy was apparent. The square root of the sum of the products of the averaged μV2 per Hz multiplied by the numbers of 1 Hz integers within each frequency band for each band shown in Figure 1A results in 78 μV for the band between 1.5 Hz and 50 Hz.
When the differences for the powerful source from the 0.5 to 1.5 Hz band was added (26 μV), the Living brain was 104 μV higher over the 0.5 Hz to 50 Hz band compared to the dead brain. This would be similar to the transcerebral availability of 0.1 mV which is within the range of a miniature EPSP (Excitatory Postsynaptic Potential)  . Like photon measurements where direct photon counts are subtracted from background (dark) counts, this value could be considered as the actual phenomena when the differences between the two electrodynamic aggregates are obtained. Because the dead brain displayed effectively similar values to those from other brains in our library   and the Living brain was representative of the data base from living populations, the quantitative value can be considered reliable.
If this assumption is valid, then the energy difference associated with “living and consciousness” relative to the “dead” organic substrate of fixed brains can be estimated. The product of 1.04・10−4 V and 1.6・10−19 A・s is 1.7・10−23 J for the aggregate of process distributed over the 1 to 50 Hz band for the cerebrum. This energetic unit is significant from two perspectives. First, it is within error measurement of the Cosmic Background Microwave (CBM) energy derived from temperature that permeates the universe  . We speculate that the convergence of the energy associated with the difference between the living and dead brain and the CBM value could support the definition of consciousness  . They have stated that “consciousness results from discrete physical events; such events have always existed in the universe as non-cognitive, proto-con- sciousness events, these acting as part of precise physical laws not yet fully understood”  . Contemporary consensus assumes CBM energy permeates the universe. If, as Mach’s principle indicates, any part of the Cosmos is determined by all of its parts  , then some representations might be residual within the appropriately fixed cerebral matter. There is some experimental evidence   that might support this interpretation. In other words, background electromagnetic fields likely interact with brain matter in non-random ways.
The Hameroff-Penrose model of consciousness assumes a pervasive physical force which orders molecular as well as other biologically-relevant events and which can be measured as changing brain states. There is evidence to suggest that human brains are influenced by subtle environmental factors including perturbations in the Earth’s electromagnetic field  . Radiofrequency-induced calcium ion efflux has also been measured in brain tissue  . Hinrikus et al.  demonstrated that microwave stimulation, known to induce vibration of charged particles and cellular membranes, produced increased EEG energy levels within human brains, particularly within the beta1 band. The effects were non-thermal. The observations presented here indicated a discrete energetic difference between pre- and post-mortem brains which was within error term of CBM. Our hypothesis requires further substantiation by independent observers with similar or greater resources. The important discovery presented here is that modern electrophysiological technology and statistical methods might reveal hidden relationships that previously could not be systematically examined.
Several models and calculations have indicated the pervasiveness of a physical substrate to Hameroff and Penrose’s depiction of consciousness would require a universal integrator. The most likely candidate is the neutral hydrogen line or precision frequency of the hydrogen atom which constitutes about 90% of the universe  . When the living-dead brain difference value of 1.7・10−23 J for the energy difference from the electrodynamics we measured here is multiplied by the hydrogen frequency (1.42・109 s−1), the result is ~1.2・10−14 W. When this power is divided by typical estimates of the cerebral cortical area  , which is in the order of 10−2 m2, the flux power density is 10−12 W・m−2.
Approximately one picoWatt per meter squared is the consistent value for photon flux density measured by many researchers as the central value from living systems that include bacteria, cells, hippocampal slices, and whole brain sections   . The potential connection to cognition was reported by Dotta et al.  who instructed volunteers who were sitting in very dark rooms to think about white light or mundane ideation over several trials. Photonic energy was measured either as flux density by analogue photomultiplier tubes or numbers of photons by digital photomultiplier units placed approximately 15 cm from the right hemisphere at the level of the temporal lobe. The quantitative relationships between this magnitude of photon flux density and energies intrinsic to action potentials and related physical substrates to “consciousness” have been consistently convergent  .
When the subjects were engaging in imagery and imagination, the increased output of photon flux density from the right hemisphere was ~10−12 W・m−2. The magnitude of the output was correlated >0.9 with the higher frequency QEEG power from the left prefrontal region. Subsequent experiments by Costa et al.  strongly suggested that the gradient of photon emissions from the human brain were temporally coupled to mediation through the thin (400 to 800 nm) axons within the corpus callosum. Although we would expect substantial complexity in the physical substrates of the living human brain and consciousness, the fact that quantitative values for the simple difference between the living brain and the dead brain can be measured so simply may open new perspectives.
As with all case studies, the intrinsic limitation is one of generalization. It is unclear whether other brains of equivalent features would produce similar results, though our experiments with coronal slices have produced reliable results across specimens. One experiment, which would serve as verification of our measurements and provide a detailed understanding of the intermediates between the living and post-mortem brain states presented here, would involve the measurement of fresh human brains after autopsy with subsequent longitudinal measures including data collection post-fixation. We do not possess the facilities or equipment to conduct the serial measurements on fresh cadavers, though human brains can be substituted by animal models assuming common mechanisms.
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