Results 11 to 20 of about 2,249 (202)

Range-dependent flexibility in the acoustic field of view of echolocating porpoises (Phocoena phocoena) [PDF]

eLife, 2015
Toothed whales use sonar to detect, locate, and track prey. They adjust emitted sound intensity, auditory sensitivity and click rate to target range, and terminate prey pursuits with high-repetition-rate, low-intensity buzzes.
Danuta M Wisniewska, John M Ratcliffe, Kristian Beedholm, Christian B Christensen, Mark Johnson, Jens C Koblitz, Magnus Wahlberg, Peter T Madsen   +7 more
doaj   +6 more sources

Simulated target search by bats using biomimetic SCAT biosonar model [PDF]

Frontiers in Computational Neuroscience
Echolocating big brown bats broadcast short, wideband ultrasonic FM pulses for foraging and navigation. These broadcasts contain frequencies from 100 to 20 kHz (wavelengths 0.34–1.7 cm).
James A. Simmons, James A. Simmons, Prithvi Thakur, Ashok Ragavendran, Chen Ming, Andrea Megela Simmons, Andrea Megela Simmons, Andrea Megela Simmons   +7 more
doaj   +2 more sources

Object localization using a biosonar beam: how opening your mouth improves localization [PDF]

Royal Society Open Science, 2015
Determining the location of a sound source is crucial for survival. Both predators and prey usually produce sound while moving, revealing valuable information about their presence and location.
G. Arditi, A. J. Weiss, Y. Yovel
exaly   +2 more sources

Size constancy in bat biosonar? Perceptual interaction of object aperture and distance. [PDF]

PLoS ONE, 2013
Perception and encoding of object size is an important feature of sensory systems. In the visual system object size is encoded by the visual angle (visual aperture) on the retina, but the aperture depends on the distance of the object. As object distance
Melina Heinrich, Lutz Wiegrebe
doaj   +9 more sources

Subsurface Behaviors of Hector's Dolphins Could Increase Their Risk of Bycatch

Conservation Letters
Hector's dolphins, endemic to New Zealand, suffer from bycatch in fishing gear. Fishing restrictions in inshore areas have reduced bycatch, although dolphins have been recorded outside these areas.
Ilias Foskolos, Mark Johnson, Deanna Clement, Olga Belonovich, Simon Childerhouse, Anton vanHelden, Darryl MacKenzie, Mike Ogle, Heloise Pavanato, Roger Williams, Rochelle Constantine   +10 more
doaj   +2 more sources

Deep Learning Methods for Assessing Time‐Variant Nonlinear Signatures in Clutter Echoes

Advanced Intelligent Systems
The biosonar systems of bats in families of horseshoe and Old‐World leaf‐nosed bats include peripheral dynamics where the outer ears undergo fast rotations and deformations during echo reception.
Ibrahim Eshera, Gaurav Duggal, Rolf Müller   +2 more
doaj   +2 more sources

Impact of Biomimetic Pinna Shape Variation on Clutter Echoes: A Machine Learning Approach

Advanced Intelligent Systems
Bats species navigating dense vegetation based on biosonar must obtain sensory information about their environments from “clutter echoes”, i.e., echoes that are superpositions from many unresolved reflecting facets (e.g., leaves) with unpredictable ...
Ibrahim Eshera, Sanmeel Lagad, Rolf Müller   +2 more
doaj   +2 more sources

Development of the hyolaryngeal architecture in horseshoe bats: insights into the evolution of the pulse generation for laryngeal echolocation [PDF]

EvoDevo
Background The hyolaryngeal apparatus generates biosonar pulses in the laryngeally echolocating bats. The cartilage and muscles comprising the hyolarynx of laryngeally echolocating bats are morphologically modified compared to those of non-bat mammals ...
Taro Nojiri, Masaki Takechi, Toshiko Furutera, Nicolas L. M. Brualla, Sachiko Iseki, Dai Fukui, Vuong Tan Tu, Fumiya Meguro, Daisuke Koyabu   +8 more
doaj   +2 more sources

Delayed response and biosonar perception explain movement coordination in trawling bats. [PDF]

PLoS Computational Biology, 2015
Animal coordinated movement interactions are commonly explained by assuming unspecified social forces of attraction, repulsion and alignment with parameters drawn from observed movement data.
Luca Giuggioli, Thomas J McKetterick, Marc Holderied   +2 more
doaj   +5 more sources

Active Control of Acoustic Field-of-View in a Biosonar System [PDF]

PLoS Biology, 2011
Active-sensing systems abound in nature, but little is known about systematic strategies that are used by these systems to scan the environment. Here, we addressed this question by studying echolocating bats, animals that have the ability to point their ...
Yossi Yovel, Nachum Ulanovsky, Cynthia F. Moss   +2 more
exaly   +2 more sources