کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6278221 1295800 2009 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Responses of neurons in the cat primary auditory cortex to sequential sounds
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب (عمومی)
پیش نمایش صفحه اول مقاله
Responses of neurons in the cat primary auditory cortex to sequential sounds
چکیده انگلیسی
In the natural acoustic environment sounds frequently arrive at the two ears in quick succession. The responses of a cortical neuron to acoustic stimuli can be dramatically altered, usually suppressed, by a preceding sound. The purpose of this study was to determine if the binaural interaction evoked by a preceding sound is involved in subsequent suppressive interactions observed in auditory cortex neurons. Responses of neurons in the primary auditory cortex (AI) exhibiting binaural suppressive interactions (EO/I) were studied in barbiturate-anesthetized cats. For the majority (72.5%) of EO/I neurons studied, the response to a monaural contralateral stimulus was suppressed by a preceding monaural contralateral stimulus, but was not changed by a preceding monaural ipsilateral stimulus. For this subset of EO/I neurons, when a monaural contralateral stimulus was preceded by a binaural stimulus, the level of both the ipsilateral and the contralateral component of the binaural stimulus influenced the response to the subsequent monaural contralateral stimulus. When the contralateral level of the binaural stimulus was constant, increasing its ipsilateral level decreased the suppression of the response to the subsequent monaural contralateral stimulus. When the ipsilateral level of the binaural stimulus was constant, increasing its contralateral level increased the suppression of the response to the subsequent monaural contralateral stimulus. These results demonstrate that the sequential inhibition of responses of AI neurons is a function of the product of a preceding binaural interaction. The magnitude of the response to the contralateral stimulus is related to, but not determined by the magnitude of the response to the preceding binaural stimulus. Possible mechanisms of this sequential interaction are discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Neuroscience - Volume 161, Issue 2, 30 June 2009, Pages 578-588
نویسندگان
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