کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7295886 | 1474427 | 2013 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of mnemonic load on cortical activity during visual working memory: Linking ongoing brain activity with evoked responses
ترجمه فارسی عنوان
اثرات بار مغناطیسی بر فعالیت قشر در حافظه کاری بصری: پیوند فعالیت مغز مداوم با پاسخ های تحریک شده
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کلمات کلیدی
الکتروانسفالوگرافی، پتانسیل مربوط به رویداد، نوسانات تتا، نوسانات آلفا، حداقل مربعات جزئی، حافظه کاری بصری،
موضوعات مرتبط
علوم زیستی و بیوفناوری
علم عصب شناسی
علوم اعصاب رفتاری
چکیده انگلیسی
The mechanisms generating task-locked changes in cortical potentials remain poorly understood, despite a wealth of research. It has recently been proposed that ongoing brain oscillations are not symmetric, so that task-related amplitude modulations generate a baseline shift that does not average out, leading to slow event-related potentials. We test this hypothesis using multivariate methods to formally assess the co-variation between task-related evoked potentials and spectral changes in scalp EEG during a visual working memory task, which is known to elicit both evoked and sustained cortical activities across broadly distributed cortical regions. 64-channel EEG data were acquired from eight healthy human subjects who completed a visuo-spatial associative working memory task as memory load was parametrically increased from easy to hard. As anticipated, evoked activity showed a complex but robust spatio-temporal waveform maximally expressed bilaterally in the parieto-occipital and anterior midline regions, showing robust effects of memory load that were specific to the stage of the working memory trial. Similarly, memory load was associated with robust spectral changes in the theta and alpha range, throughout encoding in posterior regions and through maintenance and retrieval in anterior regions, consistent with the additional resources required for decision making in prefrontal cortex. Analysis of the relationship between event-related changes in slow potentials and cortical rhythms, using partial least squares, is indeed consistent with the notion that the former make a causal contribution to the latter.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Psychophysiology - Volume 89, Issue 3, September 2013, Pages 409-418
Journal: International Journal of Psychophysiology - Volume 89, Issue 3, September 2013, Pages 409-418
نویسندگان
Tjeerd W. Boonstra, Tamara Y. Powell, Saeid Mehrkanoon, Michael Breakspear,