Representative electron micrograph of white matter region in cryopreserved pig brain (credit: Brain Preservation Foundation)
In a scenario (almost) right out of the show Altered Carbon, two researchers Robert McIntyre, an MIT graduate, and Gregory M. Fahy, PhD., 21st Century Medicine (21CM) Chief Scientific Officer, have developed a method for scanning a preserved brains connectome (the 150 trillion microscopic synaptic connections presumed to encode all of a persons knowledge).
That data could possibly be used, centuries later, to reconstruct a whole-brain emulation uploading your mind into a computer or Avatar-style robotic, virtual, or synthetic body, McIntyre and others suggest.
According to MIT Technology Review,McIntyre has formed a startup company calledNectome that has won a large NIH grant for creating technologies to enable whole-brain nanoscale preservation and imaging.
McIntyre is also collaborating with Edward Boyden, PhD., a top neuroscientist at MIT and inventor of a new expansion microscopy technique (to achieve super-resolution with ordinary confocal microscopes), as KurzweilAI recently reported. The technique also causes brain tissue to swell, making it more accessible.
Preserving brain information patterns, not biological function
Unlike cryonics (freezing people or heads for future revival), the researchers did not intend to revive a pig or pig brain (or human, in the future). Instead, the idea is to develop a bridge to future mind-uploading technology by preserving the information content of the brain, as encoded within the frozen connectome.
Images of ASC-preserved pig brain dissection. (credit: Brain Preservation Foundation)
The first step in the ASC procedure is to perfuse the brains vascular system with the toxic fixative glutaraldehyde (typically used as an embalming fluid but also used by neuroscientists to prepare brain tissue for the highest resolution electron microscopic and immunofluorescent examination). That instantly halts metabolic processes by covalently crosslinking the brains proteins in place, leading to death (by contemporary standards). The brain is then quickly stored at -130 degrees C, stopping all further decay.
The method, tested on a pigs brain, led to 21st Century Medicine (21CM), lead researcher McIntyre, and senior author Fahy winning the $80,000 Large Mammal Brain Preservation Prize offered by the Brain Preservation Foundation (BPF), announced March 13.
To accomplish this, McIntyres team scaled up the same procedure they used to previously preserve a rabbit brain, for which theywon the BPFs Small Mammal Prize in February 2016, as KurzweilAI has reported. That research was judged by neuroscientist Ken Hayworth, PhD., President of the Brain Preservation Foundation,and noted connectome researcher Prof.Sebastian Seung, PhD., Princeton Neuroscience Institute.
However, BRF warns that this single prize-winning laboratory demonstration is insufficient to address the types of quality control measures that should be expected of any procedure that would be applied to humans. Hayworth outlines here his position on a required medical procedure and associated quality control protocol, prior to any such offering.
The ASC method, if verified by science, raises serious ethical, legal, and medical questions. For example:
It may take decades or even centuries to develop the technology to upload minds if it is even possible at all, says the BPF press release. ASC would enable patients to safely wait out those centuries. For now, neuroscience is actively exploring the plausibility of mind uploading through ongoing studies ofthe physical basis of memory, and through development oflarge-scale neural simulationsandtools to map connectomes.
Interested? Nectome has a $10,000 (refundable) wait list.
* Nectome has consulted with lawyers familiar with Californias two-year-old End of Life Option Act, which permits doctor-assisted suicide for terminal patients, and believes its service will be legal. MIT Technology Review
Brain Preservation Foundation | ASC Pig Block1 Section1 16nm
Kenneth Hayworth | Aldehyde-Stabilized Cryopreservation is Cryonics for Uploaders
We describe here a new cryobiological and neurobiological technique, aldehyde-stabilized cryopreservation (ASC), which demonstrates the relevance and utility of advanced cryopreservation science for the neurobiological research community. ASC is a new brain-banking technique designed to facilitate neuroanatomic research such as connectomics research, and has the unique ability to combine stable long term ice-free sample storage with excellent anatomical resolution. To demonstrate the feasibility of ASC, we perfuse-fixed rabbit and pig brains with a glutaraldehyde-based fixative, then slowly perfused increasing concentrations of ethylene glycol over several hours in a manner similar to techniques used for whole organ cryopreservation. Once 65% w/v ethylene glycol was reached, we vitrified brains at135C for indefinite long-term storage. Vitrified brains were rewarmed and the cryoprotectant removed either by perfusion or gradual diffusion from brain slices. We evaluated ASC-processed brains by electron microscopy of multiple regions across the whole brain and by Focused Ion Beam Milling and Scanning Electron Microscopy (FIB-SEM) imaging of selected brain volumes. Preservation was uniformly excellent: processes were easily traceable and synapses were crisp in both species. Aldehyde-stabilized cryopreservation has many advantages over other brain-banking techniques: chemicals are delivered via perfusion, which enables easy scaling to brains of any size; vitrification ensures that the ultrastructure of the brain will not degrade even over very long storage times; and the cryoprotectant can be removed, yielding a perfusable aldehyde-preserved brain which is suitable for a wide variety of brain assays.
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