Jolij and Meurs had their test subjects perform a task in which they had to identify happy and sad smileys while listening to happy or sad music. Music turned out to have a great influence on what the subjects saw: smileys that matched the music were identified much more accurately. And even when no smiley at all was shown, the subjects often thought they recognized a happy smiley when listening to happy music and a sad one when listening to sad music.
“Our research results suggest that the brain builds up expectations not just on the basis of experience but on your mood as well.’
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