BIOL 306 Lecture Notes - Lecture 27: Fundamental Frequency, Azimuth, Vesper Bat
28 Nov 2017
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Review: electrolocation in bats is a form of active sensing, which contrasts to passive sensing. November 13, 2017: bats generate the acoustic signal and receive the echoes back as a source of information about the environment; they process these echoes to gather information about the environment. Insect-eating bats produce ultrasonic (>20 khz) calls for prey detection. The objects being detected has to be larger than the wavelength of the call. Therefore ultrasonic calls need to be loud due to sound attenuation (spreading loss and atmospheric attenuation) of both the calls and the echoes in order to gather sufficient information from the echoes. Class question: name an aspect of bat echolocation behavior that indicates that echolocation is a sensorimotor behavior, think about what does sensorimotor mean and how echolocation fits into this concept. In addition, why do we discuss echolocation in this context: answer: bats change the rate of calling during hunting, we use frequency in two different ways.
