Dr Jack Parry, 14 May 2026
keywords: Umwelt myelination resonance accumulated condition time meaning being-in-a-world bat platypus star-nosed mole frog saltatory conduction chiasm Bergson Einstein von Uexküll non-visual vertebrates
A frog will not extend its tongue toward a dead fly. It will lunge, with complete commitment and extraordinary speed, toward a ball of fluff vibrating at the frequency of a live fly. This is not a failure of visual discrimination. The frog can see the dead fly. The dead fly is simply not in the frog’s world. It produces no signal that resonates with the premyelinated structure of a nervous system that arrives at this encounter already tuned, inscribed not by any individual lifetime of experience but by the evolutionary history of the species, and delivered at metamorphosis to a creature that has spent its entire prior existence as an aquatic tadpole feeding on algae, with no exposure to flying insects whatsoever. The adaptive decoupling of tadpole and adult frog behaviour is documented in the literature: tadpole experience does not predict adult frog behaviour across the metamorphic transition. The prey-capture system cannot have been accumulated because there was nothing to accumulate it from. The vibrating ball of fluff, by contrast, is entirely in the frog’s world, completely and immediately. The tongue does not extend because a computation has concluded that the object is food. The tongue extends because the encounter has occurred, because the arriving signal has met the premyelinated resonance structure and completed. The meaning is the resonance. The world is everything that can resonate with what has been myelinated.
The Myelin Mind proposes that time is the structure of these encounters. Not the measurement of signal propagation. Not the interval between two events on a clock. Time is the temporal organisation of the myelinated structure as it meets the arriving world. This is Bergson’s claim made biological: lived duration is constituted not by an abstract coordinate system but by the structured capacity of a particular nervous system meeting a particular world. But the structure that constitutes this capacity takes two distinct forms across the vertebrate range.
For the frog and the bat, the structure is premyelinated. They are born with a structured capacity to resonate with their world. The frog does not accumulate a response to moving prey-sized objects: it arrives with the resonance structure already given, inscribed in the retinal ganglion cells and tectal neurons by the evolutionary history of its species rather than by the encounters of its individual life. The bat does not learn what echo delay means: the resonance structure of its auditory cortex is already in place before it has encountered a single night of flight, the capacity to meet the acoustic world delivered by species inheritance rather than individual encounter. The structured capacity is the inheritance of species time, not individual time.
For the elephant, the corvid, the human, something more is at work. Accumulation through novelty begets structure. The individual encounters of a particular life, each genuinely novel encounter with an arriving world that exceeds what has previously been met, inscribe new layers into the myelinated structure. The accumulated condition of the experienced elephant contains not only the premyelinated species inheritance of seismic and social communication but the specific inscriptions of decades of individual encounter: this family’s call, this water source, this route across this landscape. The human’s accumulated condition contains almost nothing that was premyelinated and almost everything that individual encounter has built.
What the survey of non-visual vertebrates reveals is that this structure, whether premyelinated or accumulated, is plural in a way neither Bergson nor his critics anticipated. There are as many biological times as there are distinct myelinated structures built from distinct primary sensory engagements with the world. Each primary sensory modality opens a different world. Each different world has a different temporal structure. Not faster or slower in the wired mind sense, but organised by different meanings, responsive to different resonances, containing different pasts and different futures.
The Resonant World of the Bat
The echolocating bat inhabits a world constructed entirely from resonance. Its premyelinated resonance structure , shaped across millions of years of bat-prey evolutionary relationship, is already tuned to the particular signature of a moth wing, the specific texture of a trunk, the characteristic echo of water surface before any individual encounter has occurred. The bat emits a pulse and awaits the returning resonance. What the wired mind describes as the measurement of echo delay, a temporal interval computed in the auditory cortex, is, through the Myelin Mind, the encounter between the arriving echo and the premyelinated resonance structure that meets it. The echo does not carry distance as an abstract quantity. It carries the meaning of proximity, of motion, of prey identity, because the premyelinated resonance structure has been shaped across millions of years of evolutionary encounter in which precisely these acoustic patterns preceded precisely these events. The speed of the bat’s response is the speed of saltatory conduction, which occurs only when the incoming signal meets a myelinated structure attuned to it. The bat is not fast. It is tuned. Its world contains what resonates, and what resonates becomes present in an instant because the premyelinated structure requires no individual deliberation to complete the encounter it was built for.
The bat’s world does not contain dead flies. It contains living prey, because only living prey produces the combination of echoic return, wing-beat frequency, and directional change that resonates with the premyelinated structure of a hunting nervous system. A dead moth in the path of a hunting bat is not in the bat’s world. The bat’s time is not the time of a clock measuring intervals. It is the time of an encounter unfolding within an accumulated world of meaning, where close means immediately present and distant means not yet resonant and absent means outside the world entirely.
The Electromagnetic World of the Platypus
When the platypus dives, it closes its eyes, its ears, and its nostrils. The visual world ceases. The acoustic world ceases. What remains is the encounter between the premyelinated structure of a bill covered with 40,000 electroreceptors and 60,000 mechanoreceptors, and the electromagnetic and mechanical world of the stream bed. The platypus does not calculate the temporal interval between an electrical signal and a mechanical pressure wave. Its premyelinated resonance structure is tuned to the specific combination of bioelectric field distortion and mechanical disturbance that living prey produces in water, shaped by the evolutionary history of a foraging lineage rather than by the encounters of any individual life. The encounter occurs when that combination arrives. The prey enters the platypus’s world not when it is seen but when the premyelinated structure resonates with the specific signature of its presence in water. The platypus has no visual horizon. Its world has a radius, determined not by the range of light but by the decay of bioelectric fields in fresh water, within which every heartbeat, every muscle contraction, every movement of any living thing is potentially a resonant encounter.
This is a world without a visual present, without the flat spatial panorama that the eye constructs from the simultaneous arrival of light. It is a world of intimacy and immediacy, where presence means electromagnetic proximity, where the past is whatever has already passed beyond the decay of its bioelectric signature, and where the future is whatever is moving toward the bill from within the radius of the field. Time in this world is organised not by what can be seen but by what can be felt as electromagnetic disturbance. The premyelinated resonance structure of the platypus has been shaped by encounters in this world across the evolutionary history of the species, and it resonates with signals that no vertebrate with a primarily visual myelinated structure can even register.
The Tactile World of the Star-nosed Mole
The star-nosed mole has 25,000 mechanoreceptive Eimer’s organs arranged in 22 appendages around each nostril, innervated by 100,000 myelinated nerve fibres. More than half of its sensory cortex is devoted to the star. This extraordinary allocation of myelinated structure to a single sensory surface is not an adaptation for speed in the wired mind sense. It is the biological signature of a premyelinated structure devoted entirely to tactile encounter. The mole’s world is touch. The star is its fovea, the centre of a sensory world as rich and differentiated as the primate’s visual world, but organised by texture, pressure, and shape rather than by light.
When the mole touches an object, the encounter either resonates or it does not. The accumulated myelinated condition of a mole that has spent its life in the soil, touching thousands of prey items and thousands of pebbles and roots and tunnels, carries within it the inscription of every tactile encounter it has made. The resonance with a prey item is immediate not because the mole processes information faster than the human visual system but because the accumulated condition requires so little incoming signal to complete a familiar encounter. The first touch is enough. The world of the mole contains everything that has ever produced a recognisable resonance in that tactile accumulated condition, and it does not contain what has never resonated. Pebbles are not in the mole’s world. Earthworms are. A stone that vibrates in a specific way might enter the mole’s world briefly, as the dead fly entered the frog’s world as the ball of fluff vibrated.
The mole’s time is tactile time. Its past is the accumulated inscription of every touch it has made. Its present is the encounter between that inscription and the texture currently pressing against the star. Its future is the protention of what usually follows this pattern of pressure and texture. Time is organised by what can be felt, and what can be felt resonates only when the accumulated myelinated condition has been built to receive it.
The Olfactory World of the Dog
The dog’s world is organised by chemical encounter. Its accumulated myelinated condition has been built from a lifetime of olfactory engagements with a world that is not, for the dog, spatially present in the visual sense. The chemical world persists. A person who walked through this space two hours ago is still in the dog’s world, present as a chemical residue that resonates with the accumulated condition’s inscription of that person’s specific signature. The dog does not smell the past. It encounters the past as present, because the chemical trace resonates with what has been inscribed, and resonance is encounter, and encounter is presence.
The dog’s world therefore contains a temporal depth the visual world cannot provide. The visual present is flat: it shows what is here now, and nothing of what was here before. The olfactory present is layered: it contains the signatures of what has been present, at varying intensities that correlate with elapsed time and environmental conditions, and the accumulated olfactory myelinated condition has been inscribed to resonate with these gradients as meaningful distinctions. An old trace and a fresh trace do not produce the same resonance, and they therefore do not have the same meaning. The dog’s world contains temporal distinction within what is spatially co-present, which is a form of temporal experience that no primarily visual creature can share.
The Magnetic World of the Migratory Bird
The European robin orients using the inclination angle of the geomagnetic field, detected through quantum processes in photoreceptor proteins in the retina. What the migratory bird reads in the geomagnetic field is not a spatial signal but a seasonal one. The inclination angle that encodes the direction of migration changes across the year as the Earth’s axial tilt shifts the organism’s relationship to the magnetic poles. The bird’s myelinated structure is therefore inscribed with a resonance that is seasonal in its temporal structure: specific magnetic configurations resonate with the premyelinated capacity as spring, as autumn, as the moment to depart, as the moment to arrive. The bird’s world contains the planet’s annual cycle as a dimension of present experience. It inhabits not just a spatial world but a temporal one at the scale of the year, with the magnetic field as its instrument of temporal measurement.
The Seismic World of the Elephant
The elephant inhabits a world that includes the seismic record of events tens of kilometres distant. Infrasound and seismic vibrations travel through the ground and are received through the feet and the bones of the skull, and the accumulated myelinated condition of an elephant that has lived decades in a social group carries the inscription of the specific seismic signatures of distant water, approaching storms, and the calls of family members separated by distance. When the elephant lifts a foot from the ground and stands still, tilting the weight to maximise ground contact, it is not calculating the origin of a seismic signal. It is completing an encounter between an arriving resonance and an accumulated condition inscribed by a lifetime of encounters with a world that speaks through the substrate. The elephant’s world contains what is happening thirty kilometres away, not because the elephant is receiving information from a distance but because the accumulated myelinated condition of that elephant has been built from decades of resonant encounters with the seismic record of its social and ecological world. Distance does not mean absence in the elephant’s world. Distance means a different quality of resonance, a different temporal character of encounter.
Time is Meaning, Meaning is Being in a World
The wired mind account of these nervous systems counts milliseconds and attributes them to computation. The Myelin Mind proposes something different. The speed of every response is the speed of saltatory conduction, which occurs only when the arriving signal meets a myelinated structure attuned to it through prior encounter. Resonance does not require time in the computational sense. It requires tuning. The bat is not fast; it is tuned to the acoustic world it inhabits. The mole is not faster than the human; its accumulated condition is so deeply inscribed by tactile encounter that the first touch is enough to complete the chiasm. The frog does not process visual information and reach a conclusion. The chiasm either completes or it does not, and what it completes is meaning: the meaning food, the meaning danger, the meaning familiar, the meaning foreign.
The Jakob von Uexküll who described the Umwelt, the subjective world of an organism organised by what is meaningful for it, was describing the accumulated myelinated condition and its set of possible resonances before either term existed. The tick’s world contains three things: the smell of butyric acid which means mammalian skin, the warmth of mammalian blood, and the hairiness of mammalian skin. These three signals, and nothing else, constitute the tick’s encounters. Everything else in the universe is not in the tick’s world. This is not a cognitive limitation. It is the structure of being-in-a-world as the accumulated myelinated condition defines it. The world of any organism is everything that can resonate with what has been myelinated, and nothing else.
Time, within this account, is the temporal structure of meaningful encounter. The bat’s time is not microseconds; it is the temporal organisation of a hunting world in which close and distant mean something specific and immediate because the accumulated condition has inscribed thousands of encounters in which these meanings mattered. The dog’s time is not a gradient of chemical concentrations; it is the temporal depth of a world in which the past remains present as a resonant chemical landscape. The elephant’s time is not a seismic propagation delay; it is the temporal reach of a social world inscribed across decades and extending tens of kilometres in every direction.
Bergson was right that time is biological rather than physical. But even Bergson described a single biological time, the durée of the human organism, as if biological time were one thing that the clock merely spatialises. The Myelin Mind proposes that biological time is plural, because accumulated myelinated conditions are plural, because the worlds that resonate with those conditions are plural. Einstein’s universal time describes the behaviour of light in a universe that contains no accumulated myelinated conditions and therefore no encounters and therefore no meaning. The moment biology enters the account, time multiplies. There are as many times as there are worlds of meaning built from distinct accumulated myelinated engagements with the world. And there are as many worlds of meaning as there are organisms that have been built, through the slow inscription of encounter after encounter, into the particular myelinated structures that constitute them.
There are as many times as there are ways of being in a world.
The Accumulated Worlds: Corvids, Rodents, and the Nest
Not every biological time in this survey is premyelinated. The corvid, the rat, the dog, the cat, the nesting bird: these are creatures whose myelinated structures deepen and specify themselves across a lifetime through individual encounter, whose worlds are built rather than delivered.
The western scrub jay caches food in hundreds of locations and retrieves it days, weeks, and months later. Clayton and Dickinson established in 1998 that these birds remember not only where each cache is but what was cached there and when, distinguishing perishable from lasting food and adjusting their retrieval accordingly. The what-where-when of the scrub jay’s accumulated myelinated condition is an episodic structure: a temporal record of specific individual encounters inscribed through experience, not delivered by species inheritance. The jay’s time includes a specific past, anchored to specific locations and specific events in this bird’s particular life. Clark’s nutcracker extends this further, caching thousands of seeds across mountain terrain and retrieving them up to nine months later. The accumulated myelinated condition of this bird contains a map of a mountain range built through individual encounter across years.
The rat is the animal through which the Myelin Mind’s account of sleep consolidation has been made most directly visible. As the rat runs through its environment, hippocampal place cells fire in sequence, each encoding a specific location in that specific rat’s specific spatial experience. During slow wave sleep immediately following exploration, these same cells replay the waking sequence, compressed in time by approximately twenty-fold, consolidating the spatial accumulated condition into long-term myelinated structure. Novel experiences are prioritised: the rate of sleep replay increases for unfamiliar environments, confirming that it is the encounter that exceeds the existing accumulated condition that drives the deepest consolidation. Accumulation through novelty begets structure, made visible at the cellular level in the sleeping rat’s hippocampus.
The nest is the most intimate accumulated spatial world any vertebrate constructs. Nesting behaviour has a premyelinated species-typical architecture: the basic structural template is inscribed before any individual builds its first nest. But the knowledge of this specific site, these specific local materials, this territory’s particular danger points and approach routes and microclimates: all of this is individually accumulated. The bird that returns to the same nesting territory across years is returning to an accumulated myelinated condition of a specific place, inscribed through previous breeding seasons into the white matter of a nervous system that has built this world through its own particular history.
The dog’s territory and the cat’s range are accumulations of the same kind at a finer and more continuous grain. Every room, every route, every hunting ground within the cat’s range: these are individually inscribed spatial accumulated conditions, built through years of daily encounter with a specific world. The dog that finds its way home from distances that exceed any premyelinated spatial architecture is drawing on an accumulated myelinated condition of its territory that no species inheritance could have provided. The cat whose territory has been destroyed by development does not simply lose a resource. It loses a world that took years to build, and cannot be reconstituted elsewhere.
The Ecological Argument
Standard conservation biology frames habitat destruction as a resource problem. Species lose food, shelter, breeding sites. The premise is that the organism is a resource-consuming system and the habitat is the resource environment. The Myelin Mind proposes a different and more fundamental framing.
For premyelinated species, the habitat is not a resource environment. It is the sensory world that the nervous system was structured to inhabit before the first individual encounter occurred. The frog’s wetland is not primarily a food source. It is the specific acoustic, visual, and chemical world whose spatiotemporal characteristics the frog’s premyelinated innate releasing mechanisms were built to resonate with across evolutionary time. Modify that world and the premyelinated resonance structure has nothing to meet. The organism is not resource-deprived. It is ontologically displaced: alive in a world its nervous system was not structured to inhabit.
The bat whose acoustic environment has been degraded by urban noise does not merely lose hunting efficiency. Its prewired auditory cortex is structured to process echo delays at specific signal-to-noise ratios in a specific acoustic environment. Acoustic pollution masks the returning echoes below the threshold at which the premyelinated resonance structure can complete the encounter. The world has not been emptied of prey. It has been made unintelligible to a nervous system that can only read it through the resonance it was built for.
The platypus whose stream has been contaminated by agricultural runoff does not merely face fewer prey. The electromagnetic noise introduced into the water by electrical infrastructure and agricultural chemicals overwhelms the specific bioelectric signatures that its premyelinated bill was structured to detect. The platypus cannot distinguish the heartbeat of a shrimp from the electromagnetic interference of a nearby power cable. Its world has become incoherent, not resource-poor.
The migratory bird navigating through the electromagnetic fields of an urban environment is not merely disoriented. The geomagnetic signal that its premyelinated magnetoreceptive system was structured to read across millions of years of evolutionary refinement has been corrupted by artificial electromagnetic radiation below the threshold at which the premyelinated structure can complete its encounter with the planet’s annual cycle. The bird cannot find the world that its nervous system was built to inhabit.
The cetacean is the most acute case. The acoustic world that dolphin and whale premyelinated echolocation and communication systems evolved over tens of millions of years to inhabit has been flooded with anthropogenic sound: shipping, seismic surveys, naval sonar. The premyelinated resonance structure of the cetacean nervous system was built for a specific acoustic world. That world has been modified so radically that the structured capacity to resonate with it cannot function. The ocean is still present. The nervous system is intact. The encounter cannot occur because the arriving signal no longer resonates with the premyelinated structure built to receive it. What looks from the outside like disorientation is, through the Myelin Mind, the severing of the fundamental ontological relationship between the organism’s premyelinated structure and the world it constitutes.
The conservation implication is stark. Protecting habitat is not only a matter of preserving resources. For premyelinated species it is a matter of preserving the sensory world whose specific characteristics the nervous system was structured to inhabit. A wetland drained of its invertebrates removes the frog’s food. A wetland whose acoustic and visual characteristics have been altered by drainage patterns, agricultural chemicals, and artificial light removes the frog’s world. The two losses are not equivalent. The first is recoverable through resource restoration. The second requires the restoration of the specific sensory environment that the premyelinated nervous system was built to resonate with: the specific spatiotemporal characteristics of moving prey in clean water in the specific light conditions of a particular ecological niche. Nothing less will restore the world.
A Proposed Experiment
There is a historical irony at the centre of this article that deserves its own moment. The foundational experiments establishing saltatory conduction as myelin’s primary function were conducted by Huxley and Stämpfli in 1949 on the frog sciatic nerve. The frog. The same animal whose prey capture behaviour most clearly demonstrates that conduction speed is not what determines whether an encounter occurs. The experiment that convinced neuroscience that myelin equals fast signal used the nervous system of the creature that most plainly shows speed is not the point.
The Myelin Mind proposes the following experiment as a direct test of this distinction. Present a stationary dead fly and a ball of fluff vibrating at fly-frequency to a frog. Measure signal characteristics in the optic nerve during both presentations. The Myelin Mind prediction is specific: saltatory conduction velocity will be equivalent in both conditions when a signal is generated at all, because the myelinated optic nerve conducts at the same velocity regardless of what the stimulus means. But the experiment will reveal something more precise than this. The dead fly, being stationary, does not generate the signal in the first place. The premyelinated resonance structure is already present in the retina itself. Lettvin, Maturana, McCulloch and Pitts established in 1959 that the frog’s retinal ganglion cells are tuned to specific spatiotemporal features before any individual experience can have shaped them: the class 2 cells, the bug detectors, respond to small moving objects and are largely silent to stationary ones. The dead fly does not produce the sign stimulus that these cells require. No resonance occurs. No signal is generated. There is nothing for saltatory conduction to conduct.
The vibrating fluff produces the sign stimulus. The bug detector cells resonate. Saltatory conduction delivers the signal to the tectum at its characteristic velocity. The premyelinated prey-selective tectal neurons resonate with the arriving signal. The innate releasing mechanism activates. The tongue extends.
The experiment would demonstrate what the wired mind account cannot accommodate: saltatory conduction velocity is constant and equivalent in both conditions when a signal exists. What differs is whether the premyelinated resonance structure generates a signal at all. The wired mind, committed to the premise that myelin functions primarily as a signal accelerator, would predict that faster conduction correlates with the triggering response. The Myelin Mind predicts equivalence, because speed was never the variable. Resonance was. The frog’s optic nerve conducts at the same velocity for prey and non-prey stimuli alike. The difference between a world that contains prey and a world that does not is not a difference in conduction velocity. It is a difference in whether the arriving signal meets a myelinated structure attuned to receive it.
The founding experiment of the wired mind was conducted on the animal that most clearly refutes the wired mind’s account of what myelin is for. The frog has been waiting, patiently, to make this point.
Further Reading
The foundational text establishing the Umwelt as the organism’s subjective world organised by meaningful encounter rather than objective signal: von Uexküll J. A Foray into the Worlds of Animals and Humans: with A Theory of Meaning. University of Minnesota Press, 2010. (Original work published 1934)
The primary text of Bergson’s argument against Einstein’s spatialisation of time, including the account of lived duration as irreducible to clock intervals: Bergson H. Duration and Simultaneity: Bergson and the Einsteinian Universe. Clinamen Press, 1999. (Original work published 1922)
The study establishing that echolocating bats discriminate echo delay with microsecond precision through myelinated delay-tuned circuits, and that the bat auditory cortex is specialised for processing biosonar signals of less than one millisecond duration: Macías S et al. Neural timing of stimulus events with microsecond precision. PLOS Biology. 2018;16(10):e2006422. doi:10.1371/journal.pbio.2006422.
The study establishing the combined electroreceptor-mechanoreceptor cortical organisation of the platypus and the role of temporal integration in sub-threshold prey detection: Proske U, Gregory JE. Electrolocation in the platypus: some speculations. Comparative Biochemistry and Physiology A. 2003;136(4):821-825. doi.org//10.1016/S1095-6433(03)00160-0.
The comprehensive review of the star-nosed mole’s mechanosensory organisation including 25,000 Eimer’s organs, 100,000 myelinated nerve fibres, the cortical tactile fovea, and the parallel organisation of somatosensory and visual cortical maps: Catania KC. The sense of touch in the star-nosed mole: from mechanoreceptors to the brain. Philosophical Transactions of the Royal Society B. 2011;366(1581):3016-3025. doi 10.1098/rstb.2011.0128
The account of saltatory conduction as the mechanism through which the myelinated accumulated condition resonates with matching incoming signals, producing the specific speed characteristics observable in echolocating bats, platypus electroreception, and star-nosed mole tactile processing: Fields RD. A new mechanism of nervous system plasticity: activity-dependent myelination. Nature Reviews Neuroscience. 2015;16(12):756-767. doi.org/10.1038/nrn4023.
The Myelin Mind account of the accumulated myelinated condition as the biological substrate of meaning and temporal experience, including the argument that time is the structure of resonant encounter rather than the measurement of signal propagation, is developed at length in: Parry J. The Myelin Mind: The Genesis of Meaning.
Jack Parry is a philosopher, polyglot, biomedical animator and cross-disciplinary eidetic researcher at Swinburne University of Technology. His research methodology employs moderated stochastic harnessing as a means of generating new knowledge across disciplinary boundaries. He is the author of The Myelin Mind: The Genesis of Meaning.