scholarly journals Sound Localization in the Bottlenose Porpoise, Tursiops truncatus: Signals Presented on the Horizontal Plane

1973 ◽  
Vol 54 (1) ◽  
pp. 308-308 ◽  
Author(s):  
Donna L. Renaud ◽  
Arthur N. Popper
Keyword(s):  
Sound Localization ◽  
Tursiops Truncatus ◽  
Horizontal Plane

Sound Localization in the Horizontal Plane in Patients with Supratentorial Cerebrovascular Disorders.

1995 ◽  
Vol 32 (1) ◽  
pp. 50-58
Author(s):  
Hirotaka TANAKA ◽  
Kenji HACHISUKA ◽  
Yoshinori IMAMURA ◽  
Hajime OGATA ◽  
Jinro INOUE
Keyword(s):  
Sound Localization ◽  
Horizontal Plane ◽  
Cerebrovascular Disorders

Predicting the effect of hearing-protection devices on horizontal-plane sound localization

2021 ◽  
Vol 150 (4) ◽  
pp. A340-A340
Author(s):  
Nathaniel J. Spencer ◽  
Zachariah N. Ennis ◽  
Natalie Jackson ◽  
Brian D. Simpson ◽  
Eric R. Thompson
Keyword(s):  
Sound Localization ◽  
Horizontal Plane ◽  
Hearing Protection ◽  
Plane Sound ◽  
Protection Devices

Contribution of auditory cortex to sound localization by the ferret (Mustela putorius)

1987 ◽  
Vol 57 (6) ◽  
pp. 1746-1766 ◽  
Author(s):  
G. L. Kavanagh ◽  
J. B. Kelly
Keyword(s):  
Auditory Cortex ◽  
Sound Localization ◽  
Horizontal Plane ◽  
Primary Auditory Cortex ◽  
Cortical Lesions ◽  
Mustela Putorius ◽  
Complete Destruction ◽  
Left And Right ◽  
The Right ◽  
Bilateral Lesions

Ferrets were tested in a semicircular apparatus to determine the effects of auditory cortical lesions on their ability to localize sounds in space. They were trained to initiate trials while facing forward in the apparatus, and sounds were presented from one of two loudspeakers located in the horizontal plane. Minimum audible angles were obtained for three different positions, viz., the left hemifield, with loudspeakers centered around -60 degrees azimuth; the right hemifield, with loudspeakers centered around +60 degrees azimuth; and the midline with loudspeakers centered around 0 degrees azimuth. Animals with large bilateral lesions had severe impairments in localizing a single click in the midline test. Following complete destruction of the auditory cortex performance was only marginally above the level expected by chance even at large angles of speaker separation. Severe impairments were also found in localization of single clicks in both left and right lateral fields. In contrast, bilateral lesions restricted to the primary auditory cortex resulted in minimal impairments in midline localization. The same lesions, however, produced severe impairments in localization of single clicks in both left and right lateral fields. Large unilateral lesions that destroyed auditory cortex in one hemisphere resulted in an inability to localize single clicks in the contralateral hemifield. In contrast, no impairments were found in the midline test or in the ipsilateral hemifield. Unilateral lesions of the primary auditory cortex resulted in severe contralateral field deficits equivalent to those seen following complete unilateral destruction of auditory cortex. No deficits were seen in either the midline or the ipsilateral tests.

Sound localization by the bottlenose porpoise Tursiops truncatus

1975 ◽  
Vol 63 (3) ◽  
pp. 569-585 ◽  
Author(s):  
D. L. Renaud ◽  
A. N. Popper
Keyword(s):  
Sound Localization ◽  
Tursiops Truncatus ◽  
External Auditory Meatus ◽  
Sound Sources ◽  
Low Frequencies ◽  
Lower Jaw ◽  
Wide Range ◽  
Sound Detection ◽  
Vertical Sound ◽  
Support Evidence

1. Sound localization was measured behaviourally for the Atlantic bottlenose porpoise (Tursiops truncatus) using a wide range of pure tone pulses as well as clicks simulating the species echolocation click. 2. Measurements of the minimum audible angle (MAA) on the horizontal plane give localization discrimination thresholds of between 2 and 3 degrees for sounds from 20 to 90 kHz and thresholds from 2–8 to 4 degrees at 6, 10 and 100 kHz. With the azimuth of the animal changed relative to the speakers the MAAs were 1-3-1-5 degrees at an azimuth of 15 degrees and about 5 degrees for an azimuth of 30 degrees. 3. MAAs to clicks were 0-7-0-8 degrees. 4. The animal was able to do almost as well in determining the position of vertical sound sources as it could for horizontal localization. 5. The data indicate that at low frequencies the animal may have been localizing by using the region around the external auditory meatus as a detector, but at frequencies about 20 kHz it is likely that the animal was detecting sounds through the lateral sides of the lower jaw. 6. Above 20 kHz, it is likely that the animal was localizing using binaural intensity cues. 7. Our data support evidence that the lower jaw is an important channel for sound detection in Tursiops.

scholarly journals Sound localization under conditions of covered ears on the horizontal plane

2007 ◽  
Vol 28 (5) ◽  
pp. 335-342 ◽  
Author(s):  
Madoka Takimoto ◽  
Takanori Nishino ◽  
Katunobu Itou ◽  
Kazuya Takeda
Keyword(s):  
Sound Localization ◽  
Horizontal Plane

scholarly journals Sound localization and word discrimination in reverberant environment in children with developmental dyslexia

2015 ◽  
Vol 73 (4) ◽  
pp. 314-320
Author(s):  
Wendy Castro-Camacho ◽  
Yolanda Peñaloza-López ◽  
Santiago J. Pérez-Ruiz ◽  
Felipe García-Pedroza ◽  
Ana L. Padilla-Ortiz ◽  
...  
Keyword(s):  
Sound Localization ◽  
Developmental Dyslexia ◽  
Horizontal Plane ◽  
Poor Performance ◽  
Spatial Location ◽  
Reverberant Environment ◽  
Word Discrimination

Objective Compare if localization of sounds and words discrimination in reverberant environment is different between children with dyslexia and controls. Method We studied 30 children with dyslexia and 30 controls. Sound and word localization and discrimination was studied in five angles from left to right auditory fields (-90o, -45o, 0o, +45o, +90o), under reverberant and no-reverberant conditions; correct answers were compared. Results Spatial location of words in no-reverberant test was deficient in children with dyslexia at 0º and +90o. Spatial location for reverberant test was altered in children with dyslexia at all angles, except –-90o. Word discrimination in no-reverberant test in children with dyslexia had a poor performance at left angles. In reverberant test, children with dyslexia exhibited deficiencies at -45o, -90o, and +45o angles. Conclusion Children with dyslexia could had problems when have to locate sound, and discriminate words in extreme locations of the horizontal plane in classrooms with reverberation.

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