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Table of Contents
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Description
This data arises from a large study to examine EEG correlates of genetic predisposition to alcoholism. It contains measurements from 64 electrodes placed on subject's scalps which were sampled at 256 Hz (3.9-msec epoch) for 1 second.
There were two groups of subjects: alcoholic and control. Each subject was exposed to either a single stimulus (S1) or to two stimuli (S1 and S2) which were pictures of objects chosen from the 1980 Snodgrass and Vanderwart picture set. When two stimuli were shown, they were presented in either a matched condition where S1 was identical to S2 or in a non-matched condition where S1 differed from S2.
Shown here are example plots of a control and alcoholic subject. The plots indicate voltage, time, and channel and are averaged over 10 trials for the single stimulus condition.
There were 122 subjects and each subject completed 120 trials where different stimuli were shown. The electrode positions were located at standard sites (Standard Electrode Position Nomenclature, American Electroencephalographic Association 1990). Zhang et al. (1995) describes in detail the data collection process.
Full description of the dataset: eeg_data.html
Small Dataset (2 subjects)
The small data set (smni97_eeg_data.tar.gz) contains data for the 2 subjects, alcoholic a_co2a0000364 and control c_co2c0000337. For each of the 3 matching paradigms, c_1 (one presentation only), c_m (match to previous presentation) and c_n (no-match to previous presentation), 10 runs are shown.
Number of vectors for each trial = 256
FSD for c_n (two stimuli, no-match)
Left column = control subject
Right column = alcoholic subject
Without clustering
Gauss centers in $\mu_1 = \left( - \frac{1}{2}, \dots, - \frac{1}{2} \right)$ and $\mu_2 = \left( \frac{1}{2}, \dots, \frac{1}{2} \right)$
Gauss dispersions: $\frac{1}{3} \left\| \mu_1 - \mu_2 \right\|$
All trials together:
Gauss centers in $\mu_1 = \left( - 1, \dots, - 1 \right)$ and $\mu_2 = \left( 1, \dots, 1 \right)$
Gauss dispersions: $\frac{1}{6} \left\| \mu_1 - \mu_2 \right\|$
All trials together:
Agglomerative hierarchical clustering (average linkage clustering)
Gauss centers:
Gauss dispersions: $\frac{1}{3} \left\| \mu_1 - \mu_2 \right\|$
All trials together:
FSD for c_1 (single stimulus)
Left column = control subject
Right column = alcoholic subject
Without clustering
Gauss centers in $\mu_1 = \left( - \frac{1}{2}, \dots, - \frac{1}{2} \right)$ and $\mu_2 = \left( \frac{1}{2}, \dots, \frac{1}{2} \right)$
Gauss dispersions: $\frac{1}{3} \left\| \mu_1 - \mu_2 \right\|$
All trials together:
Gauss centers in $\mu_1 = \left( - 1, \dots, - 1 \right)$ and $\mu_2 = \left( 1, \dots, 1 \right)$
Gauss dispersions: $\frac{1}{6} \left\| \mu_1 - \mu_2 \right\|$
All trials together:
FSD after channel selection (highest average energy)
Alcoholic subject was used to determine channel selection.
Left column = control subject
Right column = alcoholic subject
Gauss centers in $\mu_1 = \left( - \frac{1}{2}, \dots, - \frac{1}{2} \right)$ and $\mu_2 = \left( \frac{1}{2}, \dots, \frac{1}{2} \right)$
Gauss dispersions: $\frac{1}{2} \left\| \mu_1 - \mu_2 \right\|$
c_1 vs a_1
Three channels after selection: 1, 32, 63
c_m vs a_m
Three channels after selection: 16, 32, 55
c_n vs a_m
Three channels after selection: 16, 32, 55
Gauss centers in $\mu_1 = \left( - \frac{1}{2}, \dots, - \frac{1}{2} \right)$ and $\mu_2 = \left( \frac{1}{2}, \dots, \frac{1}{2} \right)$
Gauss dispersions: $\frac{2}{3} \left\| \mu_1 - \mu_2 \right\|$
c_1 vs a_1
Three channels after selection: 1, 32, 63
c_m vs a_m
Three channels after selection: 16, 32, 55
c_n vs a_m
Three channels after selection: 16, 32, 55
FSD after channel selection (highest average energy; jet colormap)
Alcoholic subject was used to determine channel selection.
Left column = control subject
Right column = alcoholic subject
Gauss centers in $\mu_1 = \left( - \frac{1}{2}, \dots, - \frac{1}{2} \right)$ and $\mu_2 = \left( \frac{1}{2}, \dots, \frac{1}{2} \right)$
Gauss dispersions: $\frac{1}{2} \left\| \mu_1 - \mu_2 \right\|$
c_1 vs a_1
Three channels after selection (energy in brackets): 1 (416.9), 32 (1116.7), 63 (404.0)
c_m vs a_m
Three channels after selection (energy in brackets): 16 (590.1), 32 (785.3), 55 (302.6)
c_n vs a_n
Three channels after selection (energy in brackets): 16 (489.5), 32 (669.7), 55 (297.2)
Gauss centers in $\mu_1 = \left( - \frac{1}{2}, \dots, - \frac{1}{2} \right)$ and $\mu_2 = \left( \frac{1}{2}, \dots, \frac{1}{2} \right)$
Gauss dispersions: $\frac{2}{3} \left\| \mu_1 - \mu_2 \right\|$
c_1 vs a_1
Three channels after selection (energy in brackets): 1 (416.9), 32 (1116.7), 63 (404.0)
c_m vs a_m
Three channels after selection (energy in brackets): 16 (590.1), 32 (785.3), 55 (302.6)
c_n vs a_n
Three channels after selection (energy in brackets): 16 (489.5), 32 (669.7), 55 (297.2)
Gauss centers in $\mu_1 = \left( -1, \dots, -1 \right)$ and $\mu_2 = \left( 1, \dots, 1 \right)$
Gauss dispersions: $\frac{1}{3} \left\| \mu_1 - \mu_2 \right\|$
c_1 vs a_1
Three channels after selection (energy in brackets): 1 (416.9), 32 (1116.7), 63 (404.0)
c_m vs a_m
Three channels after selection (energy in brackets): 16 (590.1), 32 (785.3), 55 (302.6)
c_n vs a_n
Three channels after selection (energy in brackets): 16 (489.5), 32 (669.7), 55 (297.2)
FSD after channel selection (highest average energy; jet colormap) - 2nd pair of subjects
Alcoholic subject was used to determine channel selection.
Left column = control subject
Right column = alcoholic subject
Gauss centers in $\mu_1 = \left( - \frac{1}{2}, \dots, - \frac{1}{2} \right)$ and $\mu_2 = \left( \frac{1}{2}, \dots, \frac{1}{2} \right)$
Gauss dispersions: $\frac{1}{2} \left\| \mu_1 - \mu_2 \right\|$
c_1 vs a_1
Three channels after selection (energy in brackets): 1 (231.6), 16 (251.5), 32 (932.1)
c_m vs a_m
Three channels after selection (energy in brackets): 1 (640.1), 32 (799.0), 63 (616.6)
c_n vs a_n
Three channels after selection (energy in brackets): 1 (559.2), 32 (715.2), 63 (539.5)
FSD after channel selection (highest average energy; jet colormap) - "+1" for 1st pair
Alcoholic subject was used to determine channel selection.
Left column = control subject
Right column = alcoholic subject
Top row = with "+1"
Bottom row = without "+1"
Gauss centers in $\mu_1 = \left( -1, \dots, -1 \right)$ and $\mu_2 = \left( 1, \dots, 1 \right)$
Gauss dispersions: $\frac{1}{3} \left\| \mu_1 - \mu_2 \right\|$
c_1 vs a_1
Three channels after selection (energy in brackets): 1 (416.9), 32 (1116.7), 63 (404.0)
c_m vs a_m
Three channels after selection (energy in brackets): 16 (590.1), 32 (785.3), 55 (302.6)
c_n vs a_n
Three channels after selection (energy in brackets): 16 (489.5), 32 (669.7), 55 (297.2)
