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During the development of the brain, young neurones need to form connections with other cells. But equally important, they need to avoid making connections with themselves.

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Modern neuroscience rests on the assumption that our thoughts, feelings, perceptions, and behaviors emerge from electrical and chemical communication between brain cells: that whenever we recognize a face, read the newspaper, throw a ball, engage in a conversation, or recall a moment in childhood, a pattern of activity in our neurons makes such feats possible. It's a tenet of modern biology that sparks fascination--and disbelief. How can a tangle of cells produce the complexity and subtlety of a mind? | Harvard Magazine May-June 2009

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"In the study, Prof. Fried observed the neural activity in the brains of 13 epilepsy patients, as the patients watched clips from TV shows like Seinfeld and The Simpsons. A short while after, the test subjects were asked to describe what they remembered from the video clips. During recall, the exact same neurons that had fired while viewing a clip fired once again while the subject was recalling it. Soon, the researchers were able to predict what clip the subjects would recall just by looking at the neurons that lit up seconds before the recall experience was vocalized."

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"Cdk5 therefore appears to be crucial only for later stages of the maturation of newborn neurons. The authors suggest that the improper connections formed by these cells could interfere with information processing in the hippocampus. However, they did not carry out any behavioural tests to explore the consequences of blocking cdk5 activity. This would be an interesting thing to do next, given the recent discovery that new neurons are needed for new memories. Nevertheless, the new findings could have important implications for the use of stem cells in cell replacement therapies for neurological diseases, as they suggest that cells would have to be transplanted accurately into specific locations in order to be effective. " (Neurophilosophy)

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If I were a sociologist of science, I would jump on mirror neurons - they are the perfect object if you want to study a scientific controversy today.

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"Now a recent breakthrough by the Cambridge neuroscientist and geneticist Seth Grant may provide a third possibility. In a report published in the June 2008 issue of Nature Neuroscience, Grant and his colleagues analyzed synapses in organisms of increasing evolutionary complexity, from single-celled organisms to vertebrates. They found that more advanced organisms also had more complex synapses, allowing neurons to communicate in more complicated ways." Seed

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The interactions of neurons reveal that connections are critical in how we decide. By John Pearson and Michael Platt, Scientific American

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