Thus, we analyzed epochs on the basis of presentation side (left/right), conflict probability (high/low), and target congruency (congruent/incongruent). Topographical maps of alpha-band power at several posttarget time windows revealed a clear decrease in alpha activity at electrodes PO7/O1 for right-presented stimuli, and PO8/O2 for left-presented stimuli (Fig. 5a).
Regional expert knowledge was used to train passive optical remotely sensed imagery of the Landsat Thematic Mapper (TM) and Enhanced Thematic Mapper Plus (ETM+) sensors, JERS-1 active radar L-band imagery, and topographical indices derived from 3 arc sec elevation data of the Shuttle Radar Topography Mission (SRTM).
Topographical distributions of discrete frequency bands were spline-interpolated [ 45] to create cortical maps for visual inspection.
EEG data was analyzed considering maximum amplitudes and topographical differences within the conventional frequency bands of delta, theta, alpha, beta and gamma.
In both conditions the differential contribution of alpha and theta was mirrored in the differential topographical distribution in these two frequency bands.
"Woodbury has a lot of different topographical variations," he said.
The topographical difference suggests that the ERD in the upper beta-band is generated in different brain areas.
For this purpose the root mean square (RMS, i.e. the square-weighted mean over the scalp) of spectral band power was calculated across channels and then plotted on topographical maps.
After further analysis following the completion of the inventory, the 0.04 ha grid cell size may have been slightly too small to create the strongest relationship between plot values (e.g. - BA, TPH, volume, carbon, etc), topographical data (elevation, slope, aspect), and remotely sensed data (e.g. - orthophoto band intensity).
Next, a dipole source of the error-related theta-band activity was localized for each subject, accounting for approximately 80% of the topographical variance.
