A study in 1994 tested 50 surgeons' ability to perform their daily operation room tasks while listening to music. The surgeons were split into three groups. The first group was allowed to choose what music they were going to listen to, while the second group had the music chosen by the experimenters. The third group did not listen to any music. The results showed that the first group had the highest task speed and accuracy, while the third group had the lowest task speed and accuracy.

This was a study done on university students that tested the effects of different kinds of music on cognitively demanding tasks (math problems). The results showed that people who were in silence scored much higher than those who listened to music. It also showed no significant difference between heavy-rock and piano music.

Kristina Olson, a professor of psychology, analyzes the advantages and disadvantages of being bilingual. There are many benefits such as, enhanced cognitive skills and mental disease immunity. However, there are some minor setbacks, such as weakened vocabulary and verbal skills in both languages. She links several studies done by professionals to back up her information.

This study compared the English vocabulary and verbal fluency of bilingual and monolingual college students. The monolingual students scored higher than the bilingual students on average. The age a bilingual student came to America was found to be a factor in their fluency.