April 30th, 2006

homuncul

NEUROSCIENCE

еще одно опровержение долгоживущего стереотипа...Показано, что нейроны генерируют и принимают не только цифровые, но и аналоговые сигналы.



Brain Communicates In Analog And Digital Modes Simultaneously

Contrary to popular belief, brain cells use a mix of analog and digital coding at the same time to communicate efficiently, according to a study by Yale School of Medicine researchers published this week in Nature.
This finding partially overturns a longstanding belief that each of the brain’s 100 billion neurons communicate strictly by a digital code. Analog systems represent signals continuously, while digital systems represent signals in the timing of pulses. Traditionally, many human-designed circuits operate exclusively in analog or in digital modes.

“This study reveals that the brain is very sophisticated in its operation, using a code that is more efficient than previously appreciated,” said David McCormick, professor in the Department of Neurobiology and senior author of the study. “This has widespread implications, not only for our basic understanding of how the brain operates, but also in our understanding of neuronal dysfunction.”
“It’s as if everyone thought communication in the brain was like a telegraph, but actually it turned out to be more similar to a telephone,” he said.


Nature, April 2006
"Modulation of intracortical synaptic potentials by presynaptic somatic membrane potential" abstract


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что, на мой взгляд, ставит под еще большее сомнение возможность эмуляции мышления на универсальной машине Тьюринга (проще говоря, с помощью компьютера), и в первую очередь бьет по 'сильному' ИИ.