Topographic Brain Mapping of EEG and Evoked Potentials

Topographic Brain Mapping of EEG and Evoked Potentials in Psychiatry and Neurology

Mapping human brain networks with cortico-cortical evoked potentials.

The cerebral cortex forms a sheet of neurons organized into a network of interconnected modules that is highly expanded in humans and presumably enables our most refined sensory and cognitive abilities. The links of this network form a fundamental aspect of its organization, and a great deal of research is focusing on understanding how information flows within and between different regions. How...

Asymmetries in topographic brain maps of auditory evoked potentials in the elderly.

We compared topographic brain maps of the middle response (MR) and late response (LR) auditory evoked potentials in two groups of elderly males. Subjects were categorized on the basis of the performance of the poorer hearing ear on the Synthetic Sentence Identification (SSI) test. Evoked potentials, obtained in response to 1000-Hz tone pips and tone bursts, were recorded under three conditions ...

Topographic voltage and coherence mapping of brain potentials by means of the symbolic resonance analysis.

We apply the recently developed symbolic resonance analysis to electroencephalographic measurements of event-related brain potentials (ERPs) in a language processing experiment by using a three-symbol static encoding with varying thresholds for analyzing the ERP epochs, followed by a spin-flip transformation as a nonlinear filter. We compute an estimator of the signal-to-noise ratio (SNR) for t...

Topographic visually evoked potentials induced by stereoptic stimulus.

Topographic processes of brain activity during stereopsis were investigated by means of two different principles, with a real stereo target and a computer stereogram. Use of either principle produced the same tendency: an electrically negative focus started from the central region of the scalp and moved to the parietal and occipital regions. These flows of excitation were seen during a period o...