Neurocognitive deficits in male alcoholics: an ERP/sLORETA analysis of the N2 component in an equal probability Go/NoGo task.

This figure is a schematic diagram illustrating four scenarios of a Go/NoGo task: two correct responses (1, 3) and two incorrect responses (2, 4). Each timeline details the sequence of stimuli and timing, including a 100 ms initial cue, varying response or inhibition windows (400 ms or 1100 ms), a 200 ms stimulus (dollar sign or 'X'), and a 1000 ms post-stimulus period. All trials conclude with a 100 ms marker and a total inter-trial interval of 2400 ms.

This is a schematic diagram illustrating the placement of 61 EEG electrode locations on a human scalp. The electrodes are organized into five regional groupings: Frontal, Central, Parietal, Occipital, and Left/Right Temporal. Specific electrodes selected for statistical analysis are highlighted with grey shading, while others remain white.

Figure 3 consists of ERP waveforms (3a) and 2-D topographic maps (3b) comparing control (green) and alcoholic (red) subjects during Go and NoGo tasks. The waveforms show voltage ($\mu$V) over time (ms) across four electrode sites (Fz, FCz, Cz, Pz), with the N2 component highlighted in the NoGo condition. The topographic maps visualize the surface potential distribution at the N2 peak, with a color scale ranging from -6 to 0 $\mu$V.

This figure consists of two grouped horizontal bar charts comparing the least square means of N2 peak amplitudes between Control (grey) and Alcoholic (black) groups across six brain regions for "Go" and "NoGo" tasks. In all regions and for both tasks, the Control group exhibits more negative peak amplitudes compared to the Alcoholic group. The x-axis represents the Least Square Means, ranging from 0 to -6, while the y-axis lists the brain regions: Rt-Temporal, Lt-Temporal, Occipital, Parietal, Central, and Frontal.

This figure presents sLORETA brain imaging maps showing statistical differences (log of ratio of averages) between Go and NoGo task conditions during the N2 time-range. Panels (a, b) display these differences for control subjects, while panels (c, d) show them for alcoholic subjects, with yellow-highlighted regions indicating areas of significant activation. The visualization includes axial, sagittal, and coronal views, with specific coordinates and p-values provided for the peak activation areas in the control and alcoholic groups.

This figure presents sLORETA brain imaging results showing statistical differences (log of ratio of averages) between groups for NoGo trials during the N2 time-range. Panel (a) displays axial, sagittal, and coronal cross-sections of the brain with yellow clusters indicating areas of significant difference, specifically localized in the frontal region. Panel (b) provides multiple 3D surface renderings of the brain, highlighting the spatial distribution of these significant clusters across different perspectives.