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Psych lecture Day 9.docx

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McMaster University
Joe Kim

Audition Aspects of Sound Waves - Amplitude o Measures loudness o Lots of ampltides around main tone, even if take out the main tone, brain can still comprehend and understand the info behind the tone because of our previous experiences - Frequency o Measures pitch o Lowest sound we can hear is a buzzing musquitto about 2 m away - Timbre: o Measure of complexity/purity o Although inst Human Ear - Couple of problems o The sound we are hearing may be very quite but we can still hear it!!! o Cochlea is filled with fluid!!!! Running through water is hard so sound o Resembes “ a contraption some ingenious plumber put together” o Ossicles are leverage system that amplify sound  vibrations from tympanic membrane makes stirrup acts like a piston  We can’t amplify all rounds  Muscles (strapedius muscle) limits the amount to which stirrup can move (as sound gets louder, the muscles constrict and limit movement of stirrup)  The reason our recorded voice sounds weird to us is because when we talk sound is conducted through our bones and so in recorded sounds we only have raw stimulus  Noise induced hearing loss – too much loudness o Hair cells become overworked o Violinists have differential hearing loss with more loss in ear near violin o The more noise you hear today, the less noise you’ll hear tomorrow Music perception - Musicians have more cortical area devoted to interpreting music than others o Some people say that this plasticity makes them smarter i.e. higher IQ o Musicians are better with spatial reasoning  i.e. mental rotation reason  The Mozart effect - individuals listening to Mozart vs . nothing are better for 15 minutes  Other studies show that more activation in frontal lobe for musicians o Why evolve music?  Social Cohesion – when making music in group have to be attending to every other person in group to make it sound good therefore more group cohesion which helps fitness and survival  Frog pond study – investigated group cohesion through music o 4 year old children walk around pond
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