Figure Legend:


Fig. 1.  Two types of spike-wave discharges in WAG/Rij rats.
 	 a. - Representative example of a spike wave discharge of the 1st
         (generalized) type.
	 b. Representative example of a spike-wave discharge of the 2nd 
         (local) type. Calibration: 1 sec., 500 mcV.
         1 - frontal, 2 - parietal, 3 - occipital.
         fig1.tif
         fig1variant.tif

Fig. 2.  The localization of the electrodes in rat # 45 and averaged form 
         of paroxysmal complexes in corresponding parts of the cortical 
         surface. The computer superposition of 10 discharge's fragments. 
         In each frame left figures shows the beginning of SWD, the right
         one - the end of SWD. Horizontal bar represents 100 msec.
         fig2.tif

Fig. 3. Spatial distribution of the spikes and waves of the 1st type of
        spike-wave discharge. Four (a,b,c,d) 3-dimensional plots of the 
        average (n=35) amplitude (microV) distribution maps of the spike 
        component made at the beginning (a) and end (c) and the average 
        amplitude distribution map of the beginning (b) and end (d) of 
        the wave component of the 1st type of spike-wave discharge. 
        e - a flattened surface of the neocortex of the rat.
        O. - occipital pole, F. - frontal pole.
         fig3.tif
 
Fig. 4. The 3-dimensional diagram for probability of the 2nd type of 
        SWD detection (averaged data,n=25). 
        a - the horizontal plane presents the surface of the cortex,
        height corresponds to the probability of a local spike-wave 
        discharge registration in the given cortical area (in percents). 
        b - the flattened surface of the neocortex of the rat, 
        each square presents a 2 x 2 mm cortical area. F. is frontal, 
        O. is occipital.
         fig4.tif

Fig. 5. Effects of haloperidol (0.5 mg/kg i.p.) and saline injection
        on the spike-wave discharges of the 1st type. Absciss - time 
        in minutes, ordinate - number of SWDs per 5 minutes ( 10 rats,
        averaged data).
         fig5.xls

Fig. 6. Effects of apomorphine administration (0.5 mg/kg i.p.) on both
        types of spike-wave discharges. 
        Averaged data (6 rats) for 1st and 2nd type of SWD. Averaged 
        number of SWDs in background EEGs was assumed as 1. Absciss - time 
        in minutes. Suppression of the 1st type of spike-wave discharges;
        facilitation of the 2nd  type of spike-wave discharges.
         fig6.xls