Unfortunately, only a limited amount of information exists regarding this sensory capability in other marine mammals. Evans, n in a review of the literature, reports comparative discrimination performance, in an echolocation task, for the Bottlenose porpoise (T•rsiops trueearns) and for the Amazon-River dolphin (lnia geoffrenisis) using submerged targets of varying reflective signal strengths. ...

Echolocation is a sensory mechanism for locating, ranging and identifying objects which involves the emission of calls into the environment and listening to the echoes returning from objects [1]. Only microbats and toothed whales have acquired sophisticated echolocation, indispensable for their orientation and foraging [1]. Although the bat and whale biosonars originated independently and diffe...

Articles you may be interested in Tracking dolphin whistles using an autonomous acoustic recorder array Depth dependent variation of the echolocation pulse rate of bottlenose dolphins (Tursiops truncatus) Bottlenose dolphins (Tursiops truncatus) moan as low in frequency as baleen whales Feeding at a high pitch: Source parameters of narrow band, high-frequency clicks from echolocating offshore h...

We have been studying the performance of a bottlenosed dolphin on a delayed matching-to-sample task to gain insight into the processes and mechanisms that the animal uses during echolocation. The dolphin recognizes targets by emitting natural sonar signals and listening to the echoes that return. This paper describes a novel neural network architecture, called an integrator gateway network, tha...

The echolocation ability of several dolphin species is well documented, but little is known about hearing characteristics of most marine mammals. This paper describes the major features of the peripheral auditory system in both large and small whales and presents a three-dimensional morphometric analysis of the inner ear in 12 species. Correlation analyses of inner ear morphometry vs. hearing c...

Emitted biosonar clicks and auditory evoked potential (AEP) responses triggered by the clicks were synchronously recorded during echolocation in an Atlantic bottlenose dolphin (Tursiops truncatus) trained to wear suction-cup EEG electrodes and to detect targets by echolocation. Three targets with target strengths of -34, -28, and -22 dB were used at distances of 2 to 6.5 m for each target. The ...

In this study, topology optimization is applied to concentrically braced frames in order to find economical solutions for conventional structural steel frames. Differential Evolution Algorithm and Dolphin Echolocation Optimization are applied for structural optimization. Numerical examples are studied and results of comparison with other meta-heuristic algorithms, including Genetic Algorithm, A...

Existing time-frequency representations are usually too noisesensitive or has too bad resolution for studying multiple transient signal components of biosonar signals. In this paper we calculate reassigned spectrograms using the first Hermite function as window. The optimal length Hermite function giving the perfectly localized reassignment for a Gaussian function is combined with a novel techn...

Echolocation is a sensory system whereby certain mammals navigate and forage using sound waves, usually in environments where visibility is limited. Curiously, echolocation has evolved independently in bats and whales, which occupy entirely different environments. Based on this phenotypic convergence, recent studies identified several echolocation-related genes with parallel sites at the protei...