Accession Number : AD0673373

Title :   EXPERIMENTAL STUDIES ON ECHOLOCATION MECHANISMS IN BATS.

Descriptive Note : Final rept. Jul 65-Jul 67,

Corporate Author : SENSORY SYSTEMS LAB TUCSON ARIZ

Personal Author(s) : Webster,Frederic A. ; Brazier,Oliver G.

Report Date : MAY 1968

Pagination or Media Count : 165

Abstract : Comparative pursuit studies carried out on three species (Myotis lucifugus, Eptesicus fuscus and Lasiurus borealis) revealed similar tactics of pursuit and capture in Myotis and Eptesicus. Detection and localization capacities of Eptesicus appeared equal to the other species, but discrimination between spheres and mealworms proved highly variable, and the capacity to capture small targets inferior. Though the measured pursuit signals of the three species had definable differences, the phases of pursuit exhibited common characteristics, adequate for real-time machine identification, and thus usable for pursuit-controlled triggering of stimuli or recording equipment. Echoes returned by objects discriminated by bats have been studied by oscilloscope and human listening. Due to the number of relatively nonfluctuating echoes from mealworms (projected into a sound field of ultrasonic pulses), other details must provide essential clues for the bats' observed discriminations. (Author)

Descriptors :   (*BATS, ACOUSTIC SIGNALS), (*ACOUSTIC SIGNALS, *POSITION FINDING), WORMS, SPHERES, TARGETS, OSCILLOSCOPES, TEST METHODS, SERVOMECHANISMS, ECHO RANGING, TARGET ACQUISITION, TARGET DISCRIMINATION

Subject Categories : Biology
      Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE