35 Result(s)
within
Jakob Christensen-Dalsgaard
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Chapter
A Nasty, Brutish, and Short History of Amphibian Bioacoustics
From prehistoric times, humans have certainly been aware of the existence of sounds of frogs and toads. The significance of sounds for mating was noted by Aristotle (Historia Animalium, translated as History o...
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Living Reference Work Entry In depth
Temporary Threshold Shift in Turtles
Temporary threshold shifts (TTS) have been studied in a variety of aquatic organisms from fish to marine mammals, but never in sea turtles. Here, turtle TTS was measured in air, and the in-air to underwater se...
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Article
Neuroethology of sound localization in anurans
Albert Feng pioneered the study of neuroethology of sound localization in anurans by combining behavioral experiments on phonotaxis with detailed investigations of neural processing of sound direction from the...
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Article
The Masked ABR (mABR): a New Measurement Method for the Auditory Brainstem Response
The auditory brainstem response (ABR) is relatively non-invasive, and in many species, the only practical way to assess auditory sensitivity. The two main methods for measuring ABR are using either transients ...
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Article
Open AccessEvidence of auditory insensitivity to vocalization frequencies in two frogs
The emergence and maintenance of animal communication systems requires the co-evolution of signal and receiver. Frogs and toads rely heavily on acoustic communication for coordinating reproduction and typicall...
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Article
From “ear” to there: a review of biorobotic models of auditory processing in lizards
The peripheral auditory system of lizards has been extensively studied, because of its remarkable directionality. In this paper, we review the research that has been performed on this system using a biorobotic...
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Article
Role of intracranial cavities in avian directional hearing
Whereas it is clear from anatomical studies that all birds have complex interaural canals connecting their middle ears, the effect of interaural coupling on directional hearing has been disputed. A reason for ...
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Article
Sound source localization and segregation with internally coupled ears: the treefrog model
Acoustic signaling plays key roles in mediating many of the reproductive and social behaviors of anurans (frogs and toads). Moreover, acoustic signaling often occurs at night, in structurally complex habitats,...
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Article
Animals and ICE: meaning, origin, and diversity
ICE stands for internally coupled ears. More than half of the terrestrial vertebrates, such as frogs, lizards, and birds, as well as many insects, are equipped with ICE that utilize an air-filled cavity connec...
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Article
Coupled ears in lizards and crocodilians
Lizard ears are coupled across the pharynx, and are very directional. In consequence all auditory responses should be directional, without a requirement for computation of sound source location. Crocodilian ea...
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Article
Low frequency eardrum directionality in the barn owl induced by sound transmission through the interaural canal
The middle ears of birds are typically connected by interaural cavities that form a cranial canal. Eardrums coupled in this manner may function as pressure difference receivers rather than pressure receivers. ...
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Chapter and Conference Paper
In-Air and Underwater Hearing in the Great Cormorant (Phalacrocorax carbo sinensis)
Hearing thresholds of a great cormorant (Phalacrocorax carbo) were measured in air and under water using psychophysics. The lowest thresholds were at 2 kHz (45 dB re 20 μPa root-mean-square [rms] in air and 79 dB...
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Article
Spatial hearing in Cope’s gray treefrog: II. Frequency-dependent directionality in the amplitude and phase of tympanum vibrations
Anuran ears function as pressure difference receivers, and the amplitude and phase of tympanum vibrations are inherently directional, varying with sound incident angle. We quantified the nature of this directi...
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Chapter and Conference Paper
Biomimetic Agent Based Modelling Using Male Frog Calling Behaviour as a Case Study
A new agent-based modelling tool has been developed to allow the modelling of populations of individuals whose interactions are characterised by tightly timed dynamics. The tool was developed to model male fro...
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Chapter
The Malleable Middle Ear: An Underappreciated Player in the Evolution of Hearing in Vertebrates
The middle ear of tetrapods (limbed vertebrates) originated from nonauditory structures, and has been modified by adaptations arising from the lifestyle of the tetrapods. These accessory structures for the inn...
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Chapter
Auditory Brain Stem Processing in Reptiles and Amphibians: Roles of Coupled Ears
Comparative approaches to the auditory system have yielded great insight into the evolution of sound localization circuits, particularly within the nonmammalian tetrapods. The fossil record demonstrates multip...
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Chapter and Conference Paper
Importance of Hearing for Survival of Danio rerio (Zebrafish) in an Experimental Predator/Prey Environment
Throughout the past 10 years, there has been an increasing interest regarding the influence of man-made noise on life in the sea. Behavioral studies show that hearing in fish (and other animals) can be impaire...
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Chapter and Conference Paper
Potential for Sound Sensitivity in Cephalopods
Hearing is a primary sense in many marine animals, and we now have a reasonable understanding of what stimuli generate clear responses, the frequency range of sensitivity, expected threshold values, and mechan...
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Chapter and Conference Paper
Modifying Directionality through Auditory System Scaling in a Robotic Lizard
The peripheral auditory system of a lizard is strongly directional. This directionality is created by acoustical coupling of the two eardrums and is strongly dependent on characteristics of the middle ear, suc...
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Article
Open AccessEvolution in Lego ®: A Physical Simulation of Adaptation by Natural Selection
We describe a physical simulation of natural selection in a population of legorgs, six-segment model organisms. Legorg morphology is genetically specified by five alleles on each segment. Legorgs show a simple...
