The reason you get tired from overthinking

London August 14, : While physical work can exhaust you Researchers have discovered why thinking about it for hours can make one feel exhausted.

This in turns alters the way you make decisions as you move towards simple actions that require minimal effort or time as cognitive fatigue develops in according to the research team who came from Pitie-Salpetriere University in Paris, France "Influential theories claim that fatigue is a type of illusion created by our brains to force us to stop what were doing and focus on something more satisfying," said Mathias Pessiglione from the University of California "But our research has shown that cognitive work can result in an actual change in function -- the accumulation of harmful substances therefore fatigue could be an indication that we should stop working , but for a different reason to maintain the quality of brain function," he added.The group wanted to find out what exactly mental fatigue is.They believed that the cause had to be in connection with the necessity to eliminate harmful substances that are a result of neural activity.To determine this the answer, they employed magnetic resonance spectroscopy (MRS) to observe the brains chemistry over the course of an entire day.They examined two categories of people that needed to think quickly and those who performed simpler cognitive tasks.They observed indications of fatigue, such as a decrease in pupil dilation only in the group that was doing intense work.

The people in this group also demonstrated in their choice a shift towards offering rewards in a short time with minimal effort.Additionally, they showed more concentrations of glutamate in synapses of the prefrontal cortex of the brain.

Together with earlier research the team observed it supports the idea that the accumulation of glutamate causes stimulation of the prefrontal cortex expensive so that control of cognitive processes becomes more difficult after an intense day of work.Is there a solution to overcome this limit of the brains capacity to think deeply? "Not at all Im afraid," Pessiglione told the press "I would recommend using the classic recipes: rest and sleeping! There is evidence to suggest that glutamate is removed from synapses in sleep." Furthermore, the checking of prefrontal metabolites can aid in detecting severe mental fatigue.

This ability could assist in adjusting work schedules to prevent burning out.Pessiglione advises workers to avoid making crucial decisions when theyre exhausted.rvt/pgh .