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

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.

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

The Journal of the Acoustical Society of America ◽

10.1121/1.1978214 ◽

1973 ◽

Vol 54 (1) ◽

pp. 308-308 ◽

Cited By ~ 1

Author(s):

Donna L. Renaud ◽

Arthur N. Popper

Keyword(s):

Sound Localization ◽

Tursiops Truncatus ◽

Horizontal Plane

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Sound localization under conditions of covered ears on the horizontal plane

Acoustical Science and Technology ◽

10.1250/ast.28.335 ◽

2007 ◽

Vol 28 (5) ◽

pp. 335-342 ◽

Cited By ~ 2

Author(s):

Madoka Takimoto ◽

Takanori Nishino ◽

Katunobu Itou ◽

Kazuya Takeda

Keyword(s):

Sound Localization ◽

Horizontal Plane

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

Arquivos de Neuro-Psiquiatria ◽

10.1590/0004-282x20150005 ◽

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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