The authors of the Paris study wanted to see whether prolonged cognitive tasks exhaust the brain's supply of nutrients. They also tested whether this type of high-focus demand builds up a greater concentration of toxic substances in the lPFC than other parts of the brain.
For example letters were displayed on a computer screen every 1.6 seconds and participants had to sort them into vowels and consonants or, depending on the color of the letter, upper or lowercase. The second group did similar but much simpler tasks. Both groups managed an average 80 percent correct response rate.
After the high and low-demand cognitive tasks, the two groups had decision tests. This included choices about their willingness to exert physical effort , cognitive effort and patience .
Source: Energy Industry News (energyindustrynews.net)
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