To read an inner state — and, in time, to answer it.
A feeling is not ineffable; it is activity in the nervous system, with a measurable signature. Berolink follows one arc up a single ladder — from reading pain, to reading emotion, to gently answering.
Every rung already has a foothold in today’s science. Our work is to climb the whole ladder — in the animals we love — for the first time.
Behaviour is a lossy readout of the mind.
Animals hide pain
Showing weakness invites attack, so suffering is concealed by instinct — often until it is severe.
The signs are ambiguous
The same posture can mean pain, fear or illness. There are no specific markers, and trained observers disagree.
Stress hides it further
Under threat an animal can look calmest when it is worst — stress‑induced analgesia masks the very moment that matters.
Today’s tools read the surface
Grimace scales and AI cameras analyse the body’s output — a downstream shadow of the state, never the state itself.
The only place that doesn’t lose the signal is its source.
Pain leaves a fingerprint in the brain.
It has an address
The affective part of pain — how much it hurts — is carried by the anterior cingulate cortex and a distributed network.
It is machine‑readable
Chronic pain has been decoded directly from intracranial recordings in people, and naturalistic acute‑pain states read from neural activity that stays stable for hours.
The easiest rung first
Pain is a strong, distributed signal — which is exactly why it is the most tractable place to begin.
The bet we name openly
This is shown in people. Establishing it in animals is precisely our work — and the conserved biology that follows is why we believe it crosses.
Shirvalkar et al., Nature Neuroscience (2023) — first‑in‑human chronic‑pain decoding · acute‑pain decoding, Nature Communications (2024).
Emotion is not ineffable. It has dynamics you can read.
States, not just stimuli
Fear, calm and arousal are carried in structured neural activity — not noise.
Stable enough to decode
Affective states are held in identifiable, stable neural dynamics that persist long enough to be read.
So the ladder continues
The same method that reads pain extends to richer emotion and state. Depth is a continuum, not a single trick.
The deep machinery of emotion is shared across mammals.
Ancient and subcortical
Fear, care, seeking and grief run on circuitry older than the cortex — homologously conserved across the mammalian brain.
Pain is universal
The pain pathway is essentially equivalent in all mammals.
So the grammar transfers
A state learned in the dog shares its neural grammar with the cat, the horse, the next species. Conserved biology — not a marketing promise.
We don’t label patterns. We learn the brain’s own variables.
Latent states
Population activity collapses onto low‑dimensional latent states — the brain’s internal variables.
Response as ground truth
The animal’s own reaction tells us what the state was, anchoring the decoder to reality rather than a hand‑written dictionary. (The behavioural‑response data BeroAI already holds — see Company.)
A model built to compound
The foundation model is designed to learn the structure shared across individuals and species, so each new brain is learned faster than the last.
Calibrated, not certain
Every read reports its own confidence.
The summit is to answer — by teaching, not commanding.
Reading is half a conversation. The other half is presenting a signal back — and writing to the brain already exists, bidirectionally, in people.
Not a command — a learning signal
We help the animal arrive at this is safe on its own, forming that memory itself. That is education; injecting behaviour would be control.
Closed‑loop = the animal’s veto
We read the response as we present the signal, and adapt or stop. The veto is in the architecture.
It tapers to nothing
Success is the signal no longer being needed. Control would have to stay on forever.
Reaching the brain no longer means opening the skull.
Berolink is not a non‑invasive headset — surface estimation cannot pass the limit of the outside. We take the gentlest route that still reaches the source: a flexible electrode array delivered through a blood vessel, resting against the cortex. No craniotomy. Reversible.
The approach is proven in people
This endovascular route has already shown 12‑month safety in humans, with no neurologic safety events. Ours is to build it for animals — the precedent is what makes that credible, not done.
Placed where affect lives
The midline venous system runs beside the medial structures where affect is strongest.
Bidirectional and evolving
Read first; the gentle write of a learning signal follows; resolution rises only when deeper rungs demand it.
Synchron COMMAND study — first FDA‑IDE trial of a permanently implanted BCI (2024): six participants, no serious brain or vascular adverse events over 12 months; motor cortex via the jugular vein.
Maximum understanding at minimum invasiveness.
One interface, deepening as the science and welfare gate allow.
Pain & arousal
Endovascular / soft‑surface. Strong signals, gentlest access.
Mode ReadEmotion → understanding
Soft, conformable surface array. Higher resolution.
Mode ReadCommunication
Bidirectional, closed‑loop interface. Read and gently answer.
Mode Read + writeStage 1 is where we begin. Stages 2–4 are the path we climb from there — each opened only when the science and the welfare gate allow.
Read pain. Read emotion. Learn what it means. Answer, by teaching. Cross to the next species.
Each rung already has a foothold in the science — Berolink is the first to climb the whole ladder, in the animals we love.