کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
930917 1474473 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Human brain response to visual stimulus between lower/upper visual fields and cerebral hemispheres
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب رفتاری
پیش نمایش صفحه اول مقاله
Human brain response to visual stimulus between lower/upper visual fields and cerebral hemispheres
چکیده انگلیسی

We studied the human brain response to visual stimulation in which a square area was randomly presented in upper and lower visual fields (VFs). Seven normal volunteers carried out a contrast-based visual search task. Magnetic responses were detected in the bilateral parietal regions at 200–250 ms after stimulus onset. We compared the response latencies and strengths of the essential single sensor and root mean square (RMS) of the regions. The former evaluates the strength of neural activity with relatively high spatial resolution, while the latter evaluates the global neural activity. The single sensor and RMS latencies for the lower left VF were significantly longer than that for the upper left (paired t-test, P < 0.05). The strengths did not differ between the upper and lower left VFs. There was no significant difference in latency or strength between the upper right and lower right VFs. These findings suggest that only left VF has different response properties in the upper versus lower VF, and that both local and global extrastriate activities are responsible for this anisotropy.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Psychophysiology - Volume 74, Issue 2, November 2009, Pages 81–87
نویسندگان
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