A study published in 2014 stated that a
sleepy brain presents symptoms similar to those developed in cases of
unilateral or hemispatial neglect syndrome. In these
types of disorder (caused by brain damage) patients lose sense of space on one
side of the body. In even more serious cases, patients can only wear one side
of the body, for example.
The scientists involved in the study
looked at volunteers who were in a dark room and seated in an armchair. As they
became sleepy, the electrodes placed in their bodies were analysed and
quantified the reaction time to the sounds on the left and right side. The
experts concluded that those who were more sleepy were less attentive to the
sounds issued on the left side.
For Masud Rusain, a neurologist at the
university of Oxford, the study proves that "a sleepy brain behaves like
the brain of a patient with injury", citing as an example the consequences
of a stroke.
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