PSYCH101 Lecture Notes - Lecture 9: Basilar Membrane, Tectorial Membrane, Ganglion

• School: University of Waterloo
• Department: Psychology
• Course: PSYCH101
• Professor: Alan Morgan

Document Summary

Even though there are few inner hair cells, there s more of type i ganglion, the majority of ganglion are involved in pitch perception. Type ii: connected to outer hair cells. They don t have to send the information very far. Involved in a feedback loop that controls what s going on at the basilar membrane. Send it to part of the brain that is quite nearby, and that part of the brain communicates back telling the hair cells what to do. The outer hairs cells are helpers. they don t do pitch perception directly but they make it work better (i. e. by amplifying the wave). There are 2 different ideas : frequency theory (timing code or the temporal code, by rutherford): when you hear a high tone, you have more action potentials per second (ap/s) than when you hear a low tone. 100hz, which corresponds to 100ap/s when you hear a frequency of 200hz 200ap/s.