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@Pappy ​

Does that 5th cup of coffee make you more intelligent?​

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Does coffee increase intelligence?

"One interesting and surprising predictor of intelligence is finger-tapping speed, which turns out to be influenced by the level of dopamine in the brain. Research on the brain's timing system has often pointed to the important role of dopamine in controlling the timing of movement and information processing speed. People who tap their fingers fast usually also think fast, and their increased processing speed correlates with their IQ score - which is not always a good predictor of real intelligence."

"Why not just drink lots of coffee and increase your brain's processing speed to the point where you appear to be a genius, even if you're not? The answer is that your brain is probably already functioning almost as fast as is safe. Most of us can push the processing speed a little without risk. Unfortunately, the neural processing speed in our brains is already just a few extra action potentials per second away from a full-blown seizure."

"Indeed, your brain works so fast that you are always vulnerable to seizures in response to many different stimuli, such as a small head injury, a stroke, rapidly flashing lights, a tumor, and so forth. Given the limitations of our brain physiology and chemistry, we are probably as smart as we possibly can be at this time in our species' evolution."
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I was recently honored by an invitation to give a TED talk on this topic area. The video is available here.
 
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