![]() Cryopreservation may be accomplished by freezing, freezing with cryoprotectant to reduce ice damage, or by vitrification to avoid ice damage. Ĭryonics uses temperatures below −130 ☌, called cryopreservation, in an attempt to preserve enough brain information to permit the future revival of the cryopreserved person. Cryonics controversially states that a human survives even within an inactive brain that has been badly damaged, provided that original encoding of memory and personality can, in theory, be adequately inferred and reconstituted from what structure remains. Cryonics proponents go further than the mainstream consensus in saying that the brain does not have to be continuously active to survive or retain memory. Conceptual basisĬryonicists argue that as long as brain structure remains intact, there is no fundamental barrier, given our current understanding of physical law, to recovering its information content. Early attempts of cryonic preservations were performed in the 1960s and early 1970s which ended in failure with all but one of the companies going out of business, and their stored corpses thawed and disposed of. Ĭritics argue that economic reality means it is highly improbable that any cryonics corporation could continue in business long enough to take advantage of the claimed long-term benefits offered. As of 2014, about 250 bodies had been cryopreserved in the United States, and 1,500 people had made arrangements for cryopreservation of their corpses. The first corpse to be frozen was that of James Bedford in 1967. It is, however, not possible for a corpse to be reanimated after undergoing vitrification, as this causes damage to the brain including its neural circuits. Cryonics procedures may begin within minutes of death, and use cryoprotectants to try to prevent ice formation during cryopreservation. ![]() Ĭryonics procedures can begin only after the "patients" are clinically and legally dead. It is generally viewed as a pseudoscience, and its practice has been characterized as quackery. Cryonics is regarded with skepticism within the mainstream scientific community. ![]() Technicians prepare a body for cryopreservation in 1985.Ĭryonics (from Greek: κρύος kryos meaning 'cold') is the low-temperature freezing (usually at −196 ☌ or −320.8 ☏ or 77.1 K) and storage of human remains, with the speculative hope that resurrection may be possible in the future. For the Hot Cross album, see Cryonics (album). For the low-temperature preservation of living tissue and organisms in general, see Cryopreservation. ![]() For the study of the production of very low temperatures, see Cryogenics. ![]()
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