frozen brain
© CREATIVE COMMONS
A rabbit's brain has been successfully returned from long-term cryogenic storage, marking the first time a whole mammalian brain has been recovered in near-perfect condition.

It marks a significant breakthrough in the field of cryonics and boosts the prospect of one day bringing frozen human brains back to life.

Researchers from 21st Century Medicine (21CM) used a new technique called Aldehyde-stabilized cryopreservation that filled the vascular system of the rabbit brain with chemicals that would allow it to be cooled to -211 degrees Fahrenheit (-135 degrees Celsius). When it was thawed, the cell membranes, synapses, and intracellular structures remained intact.

The researchers' findings, recently published in the journal Cryobiology, were recognized by the Brain Preservation Foundation, which awarded 21CM the $26,735 Small Mammal Brain Preservation Prize.

"Every neuron and synapse looks beautifully preserved across the entire brain," said Kenneth Hayworth, a PhD neuroscientist who served as one of the prize's judges. "Simply amazing given that I held in my hand this very same brain when it was vitrified glassy solid."

The new cryopreservation techniques uses a chemical process to freeze the brain to -211 degrees Fahrenheit (-135 degrees Celsius). 21CM

The current process used to cryogenically preserve human brains has been criticized for causing massive dehydration to the brain and crushing neural connections. It is believed that this process is too damaging to allow for successful future revival.

21CM's technique is the first time a procedure can protect everything in the brain associated with learning and memory.

"This result directly answers a main skeptical and scientific criticism against cryonics—that it does not provably preserve the delicate synaptic circuitry of the brain," said Hayworth.

"As such, this research sets the stage for renewed interest within the scientific community, and offers a potential challenge to medical researchers to develop a human surgical procedure based on these successful animal experiments."