PNB 2XB3 Lecture Notes - Lecture 7: Oval Window, Eardrum, Eustachian Tube

• School: McMaster University
• Department: Psychology, Neuroscience & Behaviour
• Course: PNB 2XB3
• Professor: Daniel Goldreich

Document Summary

Rarefaction opposite of compressed (dip in wave) Frequency amount of wavelengths a second =1/period. Period time taken for one up-down cycle. Universal wave equation: speed= wavelength x frequency, speed= wavelength/period, wavelength= speed/frequency, relationship between speed, period, wavelength. When a sound is closer to one ear than the other, the sound is louder and the sound arrives in that ear quicker. Sound going from your right ear, going to your left through your head (20cm difference) Outside of the ear funnels sound into the ear down into the canal. They reach the tempanic membrane (ear drum) where the external ear ends and the middle ear begins. The ossicles vibrate when the membrane vibrates, vibrating the oval window. The inner ear begins after this, and where acoustic transduction begins. When vibrate comes into the ear drum, it vibrates the ossicles and the stapes vibrates the oval window. When the stapes pushes on the oval window, the round window bulges out.