The Science of Music

Music is omnipresent in our lives. From wishing ‘Happy Birthday’ to our loved ones, to humming to our favorite tunes while doing daily chores, music finds a way to keep us company. Music allows us to convey a wide range of emotions beyond the limitations of language. And most importantly, it possesses the remarkable ability to influence our emotions and mood. But, how? Before delving into how music can affect our emotions, it is necessary to understand how we are even able to perceive it.

How do we perceive sound?

Sound originates from vibrating objects that produce sound waves, composed of moving air molecules. Music is made up of complex patterns of simpler sound waves.

There are several properties of sound that play a part in the perception of music. For instance, a piano and a guitar may produce the same note with the same frequency that sound distinct from each other. This is due to their quality of sound being different, also known as their ‘timbre’. In addition, the perceived loudness of sound is determined by the ‘amplitude’ of its sound waves. For instance, a sound wave with greater amplitude is perceived as louder.

The auditory system, including the outer, middle and inner ear, the auditory nerves, along with the brain are collectively needed to process sound. Sound waves are directed inwards by the outer ear, where they cause a thin membrane called the tympanic membrane to vibrate. These vibrations then cause three small bones called ossicles to vibrate. This transfers sound waves to the fluid-filled cochlea in the inner ear. Separate regions of the cochlea vibrate to different frequencies of the sound wave and contain sensory hair cells. These hair cells are connected to auditory nerves that transfer the signal to the brain.

How can music affect our emotions?

Music can affect our emotions irrespective of whether we are passively listening or actively singing along. The limbic system is a group of brain structures that controls emotions and behavior. It can be strongly influenced by music. Specifically, when listening to music, the amygdala, which is a small brain structure that is needed to process emotions, and the hippocampus, a part that governs memory formation, activate. By listening to a song associated with a good memory, an individual may reminisce about a moment of happiness from their past that might improve their mood in the present.

The reward system, which is a part of the limbic system, is also involved when listening to music. The medial prefrontal cortex that is involved in emotional regulation, gets rewarded, and memory lights up when people listen to familiar songs. It is also one of the regions that degenerates last in Alzheimer’s disease, which may explain why music is strongly connected to personal memories. In addition, when listening to music, the nucleus accumbens that is responsible for pleasure and reward-seeking behavior is also activated and produces the happy hormone, dopamine. This production of dopamine further contributes to the pleasure felt when listening to music, and the desire to continue listening.

Due to the positive effect of music on emotions, it can also help alleviate pain by acting as an effective distractor. The hypothalamus is a part of the brain that regulates key processes such as mood and hunger by releasing hormones itself, as well as by controlling the production of hormones from the pituitary glands. Listening to music can cause the production of endorphins by the hypothalamus and pituitary glands, resulting in pain relief as well as an improvement in mood. In addition, it may also dampen the perception of pain due to the increased dopamine production by the nucleus accumbens as mentioned previously.

Although listening to music has many benefits, it is important to choose the right music depending on your mood. If you’re having a bad day, picking tunes that are uplifting can improve your mood. Listening to melancholic or irritable music when you are already feeling upset can increase negative emotions like depression and anxiety. It is also important to consider the lyrics in songs, especially those related to violence and negativity, as they can also negatively affect our mood.

Music can not only affect our emotions but can also have an impact on our cognitive function.

How can music affect our cognitive function?

Music can improve cognitive function, for instance by reducing stress. Stress can negatively affect cognitive function and can cause various issues related to memory and concentration. It has been found that listening to music can decrease blood pressure, heart rate, and the levels of the stress hormone, cortisol. By decreasing stress levels and enhancing mood, music can also improve symptoms of depression and anxiety.

Music therapy, involving regular sessions with a certified therapist, in combination with standard treatment, can better alleviate depression symptoms and enhance quality of life.

Music may also help improve cognitive impairment, such as dementia. It was found that when patients with dementia listen to familiar songs from their youth, they can access memories and enhance recall. This may lead to a lower rate of cognitive decline as found in a study on patients with dementia who received music therapy in addition to the current standard of care.

In conclusion, music significantly impacts our well-being by affecting our emotions and improving cognitive function. Next time we put on our favorite song, we can all take a moment to appreciate just how much it can influence our lives.