BIO SCI 35 Lecture Notes - Lecture 12: Human Echolocation, Tinnitus, Outer Ear
24 Feb 2018
School
Department
Course
Professor
8
BIO SCI 35 Full Course Notes
Verified Note
8 documents
Document Summary
Sound is vibrations in air that is produced by some source. Sound source wave -> hits object -> reflects back. Human hearing range is between 40 hz and 20000 hz. Bat chirps range between 20000 hz and 150000 hz. Bat chirps, and when prey comes closer the frequency gets higher - used by bat to sense/locate the prey. Localization accuracy: 1. 5 deg auditory angle (pretty accurate) Same as vision in our near periphery (30 degrees) Visual cortex is active during simulated echolocation in blind individuals. Advocates of independent living for the blind trains individuals in advanced echolocation. Some bones that apply force onto a window that has access to the fluid in the cochlea. Interface onto which sound waves come and are converted into mechanical force. Breaks down the pitches that make up a sound. Basilar membrane in the middle of the cochlea. Quite thick near the base, but more flexible at the tip.
