Why Are Humans Musical?
The hypothesis is that the evolution of vocal learning, that is musical traits, is influenced by the need of a species to deal with the disturbing sounds that are created in connection with locomotion. These sounds can affect our hearing only when we move.
“When several people with legs of roughly the same length move together, we tend to unconsciously move in rhythm. When our footsteps occur simultaneously, a brief interval of silence occurs. In the middle of each stride we can hear our surroundings better. It becomes easier to hear a pursuer, and perhaps easier to conduct a conversation as well,” explains Larsson.
Better chances for survival
However, apes up in the treetops move unpredictably and irregularly in the varied vegetation. Apes do not move in a particularly regular fashion on the ground either. When humans made the transition to walking on two legs, the sounds of their movements became significantly more predictable, making it possible for them to listen to nature better and thereby increase their chances of survival.
A behaviour that has survival value tends to produce dopamine, the “reward molecule”. In dangerous terrain, this could result in the stimulation of rhythmic movements and enhanced listening to surrounding sounds in nature. If that kind of synchronized behaviour was rewarding in dangerous environments it may as well have been rewarding for the brain in relative safety, resulting in activities such as hand- clapping, foot-stamping and yelping around the campfire. From there it is just a short step to dance and rhythm. The hormone dopamine flows when we listen to music.
Contacts and sources:
Petra Ekenstam
Swedish Research Council
Citation: The entire article is available at: Larsson, M. Self-generated sounds of locomotion and ventilation and the evolution of human rhythmic abilities.
Animal Cognition: http://link.springer.com/article/10.1007/s10071-011-0433-2
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