Scipsy

@Alchemico: sul Blue Brain Project. Ne avevo già sentito parlare. Cosa ne penso, penso varie cose.

E’ teoricamente possibile costruire un cervello funzionante? Sì, non ci sono dubbi.

Devo dire che dal video che mi hai linkato non mi pare di aver intravisto niente di più di quello che già si fa con le varie tecniche di brain imaging, per dire, andare a vedere l’attività elettrica del cervello è già una cosa che si fa con l’fMRI. Naturalmente questa è una mia impressione, e non ho molte informazioni per dire dove siano arrivati.

Però ho spulciato le FAQ del sito del progetto, e mi sembra che, rispetto alle parole del video, le aspirazioni siano molto più moderate (e io credo anche più realistiche):

[…] Simulating the human brain at the molecular level is unlikely with current computing systems. […]

[…] It is very unlikely that we will be able to simulate the human brain at the molecular level detail with even the most advanced form of the current technology. […]

[…] Do you believe a computer can ever be an exact simulation of the human brain? 

This is neither likely nor necessary. It will be very difficult because, in the brain, every molecule is a powerful computer and we would need to simulate the structure and function of trillions upon trillions of molecules as well as all the rules that govern how they interact. You would literally need computers that are trillions of times bigger and faster than anything existing today.

Is the brain like a computer?

In some ways yes, but in most ways it is not at all like a computer. The brain performs many analog operations which cannot be performed by computers and in many cases it achieves hybrid digital-analog computing. The most important feature of the brain that makes it different from computers is that it is constantly changing. If the resistors and capacitors in a computer started changing, then it would immediately malfunction, whereas in the brain such equivalent properties change constantly on the time scales of milliseconds to years. The brain is more like a dynamically morphing computer.  We are still far from understanding the rules that govern the brain’s genetically and environmentally driven self-organization in response to external stimulus. […]

Diciamo che siamo ancora molto lontani dal costruire cervelli.