کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4330238 | 1614254 | 2007 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Interaural intensity difference and ear advantage in listening to dichotic consonant-vowel syllable pairs
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علم عصب شناسی
علوم اعصاب (عمومی)
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چکیده انگلیسی
The right-ear advantage (REA) is typically observed in verbal dichotic listening, indicating a left hemisphere superiority for speech processing. The REA could be thought of as a bottom-up, stimulus-driven laterality effect, caused by the preponderance of the contralateral neural fibers from the right ear to the auditory/speech processing areas in the left temporal lobe. The REA can, however, be modified by explicitly requiring the listeners to focus their attention alternatively on the left or right-ear stimuli, thus either countering or enhancing the bottom-up processes through top-down attentional control. In the present study, we manipulated the strength of the bottom-up REA by inducing an intensity difference between the right-ear and left-ear speech inputs in order to make the REA either weaker (left-ear input > right-ear input) or stronger (left-ear input < right-ear input) and also examined how this manipulation affected the top-down attention modulation effects. Twenty healthy participants listened to dichotic presentations of consonant-vowel syllable pairs with different attention instructions. The results showed that the interaural intensity difference significantly affected the ear advantage in the predicted way. It also interacted with the top-down control effects, attentional control having a stronger effect when attending to the ear that had a weaker sound intensity, as compared to when the intensities were equal.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Brain Research - Volume 1185, 14 December 2007, Pages 195-200
Journal: Brain Research - Volume 1185, 14 December 2007, Pages 195-200
نویسندگان
Jussi Tallus, Kenneth Hugdahl, Kimmo Alho, Svjatoslav Medvedev, Heikki Hämäläinen,