NSCI 400D1 Lecture Notes - Lecture 1: Granger Causality
8 Jan 2017
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On the role of alpha and gamma signals. Idea: by shutting down non-relevant part of the nodes. How these oscilattions are done by top-down control. Alpha power increases prior to anticipated distracters. Now its clear that alpha is to remove distracting working memory. Performance impaired if alpha does not inc before distracter. Combining fmri and eeg to understand the gating of alpha inhibition. Apply eeg-fmri to test gating by alpha. Fissrt finding: you can find sth. in the eeg signal. Bold in the dorsal attention network correlates negatively w visual alpha power. Highly constraining context: :in order to see the cells he uses microscope . Key finding: highly constraining munus lowly constraining sentences. Alpha dominates in monkeys sensorimotor area, as what we see in humans. Spiking decreases as alpha power increases in monkey. Alpha oscillations prevent firing in a phasic manner. Gamma power in superficial layers is coupled to alpha phase in deep layers feedforward by gamma, feedback by alpha.
