Biology and neurophysiology of the conditioned reflex and by P. K Anokhin

By P. K Anokhin

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Extra resources for Biology and neurophysiology of the conditioned reflex and its role in adaptive behavior, (International series of monographs in cerebrovisceral and behavioral physiology and conditioned reflexes)

Sample text

Elucidation of dynamic, synchronously oscillating networks in the brain requires the localization of the generators of task-relevant oscillatory brain activity, and subsequently, estimation of phase synchronization between those sources. This step is necessary if strong claims are to be made about the putative engagement of specific brain regions in large scale, synchronous, oscillatory brain networks. Moreover, such analyses make some progress toward solving the related problems of spurious synchronization induced by volume conduction and by signal superposition.

For example, Green and McDonald (2008) used BESA beamformer to uncover a series of activations in theta-band-filtered EEG signals as human subjects performed a visual attention orienting task. The order and timing of activations (early visual cortex, parietal lobe, frontal cortex, parietal lobe, and early visual cortex again) corresponded to the expected sequence of activations involved in orienting visual attention to a specific region of visual space under endogenous control. Recently we combined theta-band beamformer sources identified from EEG data by BESA with PLV analysis to reveal task-dependent synchronization effects between sources in the context of both auditory and visual endogenous attention orienting.

2000), indicating that the activity recorded by the reference channel will significantly affect the coherence measurements. To overcome this problem, the synchronization must be estimated after an appropriate post-recording transformation capable of eliminating this referential scheme, provided it does not introduce a new distortion! , 2007). Note that the distortion is produced by the amalgamation of two signals. We can still fairly ask: what is the synchronization of those traces we are observing?

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