PSYC 2390 Lecture Notes - Lecture 9: Eardrum, Tensor Tympani Muscle, Semicircular Canals

• School: University of Guelph
• Department: Psychology
• Course: PSYC 2390
• Professor: Lana Trick

Document Summary

Sound is mechanical energy: when one molecule hits another, speed of sound depends on how close the molecules are. Molecules are closer in water, so travel faster in water than air. When molecules are father apart: pressure wave. Fluctuates above (compression) and below normal (rarefacion) with ime. Height of the wave above or below normal. Sotest humans can hear (0. 0002 dynes/cm/cm: dyne = force needed to push 1 gram of air. How many waves there are per second (herz) High c on piano = 4106 pressure waves per second. Cats and dogs can hear higher frequencies than humans: timbre. Flute is the closet to the perfect sine wave. Ear does fourier"s analysis and takes apart complex waves into individual sine waves: phase. Has to do what point of the wave you"re at: 0 - start of wave, 90 - compression peak, 180 - half point of wave, 270 - rarefacion peak, 360 - end of wave.