Horizontal angular discrimination by an echolocating bottlenose dolphin (<i>Tursiops</i> <i>truncatus</i>)

Branstetter, Brian K.; Herman, Louis M.; Pack, Adam A.; Mevissen, Sonja J.; Moore, Anthony N.; Granum, Jamie; Carsrud, Lea K.; Butler, Carol A; Lecaroz, Sarah B.; Roberts, S. J. Roberts

doi:10.1121/1.4743813

Cited by 3 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Absence of the directivity non-coherent pulses is caused due to natural necessity in broadcast transmission both the phonemes and probing pulses. Whereas the directional reception both the echo-signals and dolphin speech from all directions around of a dolphin can be performed by a new external ear [8][9][10][11] with the localization accuracy of 1˚ -3˚ [49][50][51].…”

Section: Discussionmentioning

confidence: 99%

Some Aspects of Analysis of Dolphins’ Acoustical Signals

Ryabov¹

2011

OJA

View full text Add to dashboard Cite

Dolphins produce various types of sounds in a wide range of frequencies. Characteristics of some sounds till now have not been correctly registered, that influenced on interpretation of their functions. Studying of the characteristics and functions of dolphins' acoustical signals is the purpose of the present work. In this work the acoustical signals of two dolphins (Tursiops truncatus) were registered by two-channel system in the frequencies band up to 200 kHz at quasi-stationary position of the dolphins. The dolphins along with whistles are producing the packs of coherent and non-coherent broadband pulses. The waveform and spectrum of coherent pulses was invariable within a pack, but considerably varies from a pack to a pack. The waveform of each non-coherent pulse vary from a pulse to a pulse in each pack, therefore their spectrum also vary from a pulse to a pulse and have many extremums in the band of 6-200 kHz. It is very likely that the non-coherent pulses play a part of phonemes of a dolphin spoken language and the probing signals of dolphin's noncoherent sonar. The use possibility of the signals by dolphins for communication and orientation was considered, as the signals apparently are bimodal. Results of the work have significance for further studying of the dolphin's sonar and spoken language.

show abstract

Section: Discussionmentioning

confidence: 99%

Some Aspects of Analysis of Dolphins’ Acoustical Signals

Ryabov¹

2011

OJA

View full text Add to dashboard Cite

show abstract

“…The primary use of the eye cups was not to force the dolphin to use echolocation, but to prevent her from attending to visual distractions that appeared to be a problem during the training phase of this experiment. Eye cups are routinely used in echolocation studies that have shown dolphins can discriminate and recognize objects, and can navigate through their environment without the use of vision [ 35 – 37 ].…”

Section: Methodsmentioning

confidence: 99%

Recognition of Frequency Modulated Whistle-Like Sounds by a Bottlenose Dolphin (Tursiops truncatus) and Humans with Transformations in Amplitude, Duration and Frequency

et al. 2016

Self Cite

View full text Add to dashboard Cite

Bottlenose dolphins (Tursiops truncatus) use the frequency contour of whistles produced by conspecifics for individual recognition. Here we tested a bottlenose dolphin’s (Tursiops truncatus) ability to recognize frequency modulated whistle-like sounds using a three alternative matching-to-sample paradigm. The dolphin was first trained to select a specific object (object A) in response to a specific sound (sound A) for a total of three object-sound associations. The sounds were then transformed by amplitude, duration, or frequency transposition while still preserving the frequency contour of each sound. For comparison purposes, 30 human participants completed an identical task with the same sounds, objects, and training procedure. The dolphin’s ability to correctly match objects to sounds was robust to changes in amplitude with only a minor decrement in performance for short durations. The dolphin failed to recognize sounds that were frequency transposed by plus or minus ½ octaves. Human participants demonstrated robust recognition with all acoustic transformations. The results indicate that this dolphin’s acoustic recognition of whistle-like sounds was constrained by absolute pitch. Unlike human speech, which varies considerably in average frequency, signature whistles are relatively stable in frequency, which may have selected for a whistle recognition system invariant to frequency transposition.

show abstract

“…, ), thus demonstrating that through echolocation, dolphins can appreciate the spatial structure of objects. An ability to make fine angular discriminations by echolocation (Branstetter et al . , ). An ability to demonstrate an awareness of its own actions (Mercado et al . , ), thus revealing new dimensions of dolphin self‐awareness beyond mirror‐self recognition (Reiss and Marino ). An ability to understand human directed referential pointing at distally placed objects; a skill which comes easily to the dolphin (Herman et al .…”

Section: Biographymentioning

confidence: 99%

“…• An ability to make fine angular discriminations by echolocation (Branstetter et al 2003(Branstetter et al , 2007.…”

Section: Biographymentioning

confidence: 99%