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Additional info for Application of Brain Oscillations in Neuropsychiatric Diseases: Selected Papers from “Brain Oscillations in Cognitive Impairment and Neurotransmitters” Conference, Istanbul, Turkey, 29 April–1 May 2011

Example text

Further, it is important to analyze the changes in two different windows: the selection of digital filters in the conventional 4–7 Hz filter limits could lead to crucial information lost in this example. 3. Differentiated changes of theta responses in BD Evoked and event-related slow and fast theta oscillations in response to auditory stimuli were studied in 22 euthymic, drug-free patients with BD. Slow (4–6 Hz) and fast (6–8 Hz) theta responses behaved differently during oddball paradigm in 30 patients with BD.

When a simple sensory stimulus is used, a sensory network becomes activated and “sensory evoked coherence” can be measured between brain regions, whereas an oddball task initiates activation in both a sensory network and an additional cognitive network, and then “event-related coherence” can be measured. In the following, some rules and concepts are presented: (1) Intrinsic oscillatory activity of single neurons forms the basis of the natural frequencies of neural assemblies. Oscillatory activity of the neural assemblies of the brain consists of the alpha, beta, gamma, theta, and delta frequencies.

2. Selectively distributed oscillatory networks Again, according to the summary of results for AD, schizophrenia, and BD patients in Tables 2–4, recordings should be analyzed for multiple oscillations and at selectively distributed sites, rather than at one location. Selective connectivity between selectively distributed neural networks has to be computed by means of spatial coherence. It is necessary to compare EROs (triggered by stimulations including a cognitive load) with sensory evoked oscillations (see Tables 2–4).

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