BIEB 166 Lecture Notes - Lecture 18: Particle Velocity, Eardrum, Parasitoid Wasp
8 Nov 2013
School
Department
Course
Professor
Document Summary
Sound reception is the reverse of sound generation: a receiver must couple the signal in the medium to itself, modify the signal as needed, and then characterize the signal. Take a sound from outside environment, a lower pressure. Cause vibration in the sound receiving structure. Funnel sound to go into the holes, ear drums right below the eyes. Small levered hairs are deflected when hit by air particles of the near field of a sound. Limited to detecting lower frequencies and slow temporal changes in sound. We are able to feel the breeze coming from a specific direction. Sound pressure does not have a inherent directionality. Specific adaptation for animals to know where does the sound come from. Tell inherently where the sound come from (by hair) Hair moving away from where the particle came. In fruit flies, the males move their wings to generate particle velocity sound that the female detected.
