A mild decrease of oxygen supply to the brain can selectively impair the brain's arousal levels and behavioral responses, but not orienting of spatial attention and executive control functions. This is indicated by the findings of a study carried out by the Institute of Molecular Bioimaging and Physiology in collaboration with the University of Milan Bicocca. These findings were presented at the "2014 Society for Neuroscience" Annual Congress, the largest and most influential Neuroscience Congress in the world (32286 participants), held in Washington DC, USA.
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