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" "The fact that a gene must be switched on to form a long-term memory shows clearly that genes are not simply determinants of behavior but are also responsive to environmental stimulation, such as learning.
Eric Richard Kandel (born November 7, 1929) is an Austrian-American neuropsychiatrist and recipient of the 2000 Nobel Prize in Physiology or Medicine, shared with Arvid Carlsson and Paul Greengard. His research entails the physiological basis of memory storage in neurons.
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Even though I had long been taught that the genes of the brain are the governors of behavior, the absolute masters of our fate, our work showed that, in the brain as in bacteria, genes are also servants of the environment. ...An environmental stimulus... activates modulatory interneurons that release serotonin. The serotonin acts on the sensory neuron to increase cyclic AMP and to cause protein kinase A and MAP kinase to move to the nucleus and activate CREB. The activation of CREB, in turn, leads to the expression of genes that changes the function and the structure of the cell.
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By merely observing the electrical activity in the brain, Libet could predict what a person would do before the person was actually aware of having decided to do it. This finding caused philosophers of mind to ask: If the choice is determined in the brain before we decide to act, where is free will? ...choice in action, as in perception, may reflect the importance of unconscious inference. Libet proposes that... just before the action is initiated, consciousness is recruited to approve or veto the action.