کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4345814 1296756 2010 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dissociation of summation and peak latencies in visual processing: An MEG study on stimulus eccentricity
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب (عمومی)
پیش نمایش صفحه اول مقاله
Dissociation of summation and peak latencies in visual processing: An MEG study on stimulus eccentricity
چکیده انگلیسی

Research on the temporal characteristics of visual processing, as measured with critical flicker fusion or the latency of visual evoked potential (VEP), shows controversial results if different eccentricities of visual stimuli are compared. To clarify this question, a direct measure of cortical activity with magnetoencephalography (MEG) was applied to examine the neuronal summation latency and peak latency for both near and far peripheral stimuli. Consistent with cortical magnification, the peak amplitude for less eccentric stimuli was larger than that for more eccentric stimuli. More importantly, the current data also demonstrated longer cortical summation latency and peak latency for more eccentric visual stimuli, but only the summation latency difference between near and far stimuli correlated with the peak amplitude difference between near and far stimuli. These results suggest dissociable mechanisms of summation latency and peak latency with respect to their contributions to the stimulus eccentricity effect, and provide potential explanations for controversial results in previous studies.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Neuroscience Letters - Volume 483, Issue 2, 11 October 2010, Pages 101–104
نویسندگان
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