Cryonic Suspension
Image from Anders Sandberg

Suspending organic functions by the use of low temperatures to halt metabolic decay. Cryonic suspension employs cryoprotective chemicals to protect the body, chemicals that bond the cellular components in place, etc.

Cryonic technology was used from the Information Age onwards to preserve the bodies (or sometimes just the heads) of people who paid for the treatment before their death. This early form of cryonic technology was not advanced enough to preserve memories and personality, although some early cryogenic subjects were recreated as personality simulations using all data available, including lifelogs, biographical, autobiographical material and audiovisual recordings. The small amount of information available from the frozen corpsicle was sometimes useful as well.

More advanced cryogenic freezing was available by the time the first interstellar colony ships were being constructed, and some test subjects had been successfully revived. Cryonic suspension was viewed as sufficiently reliable to be used in many of the early interstellar colony missions, although when the ships finally arrived decades or centuries later there were many casualties. Some subjects were irretrievably dead, and many more had brain damage or other tissue trauma.

Various techniques were developed on some colony worlds to repair the damage, which were successful in some cases, although they often included radical neural and mnemonic reconstruction.

Cryonic freezing has since been replaced by much safer nano-mediated biostasis technology.
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Development Notes
Text by M. Alan Kazlev, amended by Steve Bowers
Initially published on 07 January 2002.