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The majority of research into the emotional and behavioral effects of popular music has focused on heavy metal, though a few studies have also included rock and grunge music. Overall, the popular belief that listening to certain musical styles causes a variety of behavioral problems is not supported.
Emotional Response
While a number of researchers have associated heavy metal music with depression or anger, these effects do not occur when heavy metal is the listener’s musical preference. A study of more than 1,000 gifted students aged 11-18 found that heavy metal music is used for cathartic release and to dissipate negative emotions, particularly among those with low self-esteem.
Grunge Music Effects
A study of the effects of different types of music found that after listening to grunge music, subjects reported increases in fatigue, tension, sadness and hostility, as well as decreased mental clarity, vigor, relaxation and compassion. However, grunge was likely not the musical preference of these subjects—a study of grunge fans may have produced different results.
Aggression
Some studies have found that individuals become more hostile, aggressive or angry after listening to heavy metal music, whereas others have found no aggressive response. Some researchers have even found that subjects who were angry to begin with become happier, calmer and more relaxed after listening to heavy metal when it is their preferred musical genre.
Suicide
Although the suicide rate is higher among rock and heavy metal fans (particularly the latter), a study of students with psychiatric disorders who were also heavy metal fans actually showed improved mood after listening to their music of choice. Other studies of depressed students have found similar results, suggesting that students may use this music to help treat their depression rather than becoming depressed as a result of listening to it.
Academic Performance
Some studies have found that adolescents of both genders who listen to heavy metal tend to have lower grades in school, but this is likely due to aspects of personality or environment (such as high stress) rather than any direct effects of the music itself.
Intelligence
Interestingly, college students whose musical preferences are alternative, rock or heavy metal actually obtain higher IQ test scores on average, particularly on questions where abstraction is required. Some studies have also found high intelligence among adolescent heavy metal listeners.
Risk Taking
Those who prefer rock or heavy metal music are more inclined to be reckless sensation seekers who take risks. This is a personality type rather than a direct effect of the music—sensation seekers have less reactive nervous systems and so it takes more intense stimuli to generate a sensation of happiness or excitement.
Risk takers are more likely to commit crimes because they are not as anxious about the consequences. This is not caused by the music however; the risk taker prefers more energetic music and more dangerous pastimes as a result of innate personality and physiology.
Drug Use
Studies regarding a link between heavy metal music and drug use have generated mixed results. One study found that teenagers who listened to heavy metal were more inclined to use drugs, though they were not more likely to use them excessively or become addicted. Other researchers have found no link between music preference and drug use or drug-related values. Overall, use of alcohol and/or drugs by parents has the greatest influence on adolescent drug use.
Attitudes Toward Women
A study of undergraduate men found that exposure to sexually violent heavy metal music increased the tendency to stereotype sex roles and hold more negative perceptions of women. However, this was likely the result of the sexually violent content rather than the heavy metal music itself.
Effect on Animals
A student named David Merrill subjected mice to the music of a heavy metal band called Anthrax 24-hours a day to discover how it would affect their ability to learn new things, but instead of completing Merrill’s maze, the heavy metal mice all killed one another.
In a subsequent experiment in which the mice listened to heavy metal music for 10 hours each day, they did not become homicidal, but they did grow worse at solving the maze than they had been when they first encountered it. But research indicates that reactions to music are shaped by whether or not it is the genre of choice, and it's highly unlikely that if the mice had a musical preference at all, it would have been Anthrax.
Effect on Plants
Dorothy Retallack tested the effects of various types of music on plants. She found that playing classic rock artists such as Led Zeppelin, Jimi Hendrix and Vanilla Fudge caused the plants to grow in an unhealthy way, bend away from the speakers and die young. However, if we assume that plants can have musical preferences, it's possible that classic rock was not their music of choice.
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