Brain uploading in the NY Times

An article in the NY Times, by Kenneth Miller, addresses the question of whether or not we will one day be able to upload a brain, that is, to simulate in a computer the complete behaviour of a human brain.

The author, a neuroscientist from Columbia University, addresses carefully the challenges involved in mind uploading and whole brain emulation.

544px-DTI-sagittal-fibers

The author’s (wild) guess is that it will take centuries to determine a connectome that is detailed enough to enable us to try brain uploading.

However, he also recognises that we may not need to reconstruct all the fine details of a brain, with its billions of neurons and trillions of synapses, whose structure varies in time and space. Still, a level of detail incommensurable with existing technology would be required to even have a shot of creating a model that would reproduce actual brain behaviour.

It seems the singularity may not be over the corner, after all…

(Image by Thomas Schultz, avaliable at Wikimedia commons).

The aliens are silent because they are dead

In a paper recently published in the journal Astrobiology, Aditya Chopra and Charles Lineweaver, from the Australian National University, argue that the reason we have not met intelligent aliens is because, in general, life does not evolve fast enough to become a regulating force on planet ecologies.

Heavens_Above_Her

If this explanation holds true or if it is, at least, one of the possible explanations, then many planets may have developed life, but in few or none of them has life lasted long enough to be able to regulate greenhouse gases and albedo, thus maintaining surface temperatures compatible with life. If this is true, then extinction is the default destiny for the majority of life that has ever emerged on planets in the galaxy and the universe. Furthermore, only planets where life develops rapidly enough to become a regulating force in the planet ecology remain habitable and may, eventually, develop intelligent life.

(Photo by By Ian Norman, via Wikimedia Commons).