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Lack of interhemispheric transfer of the 1 hertz suppression effect in rats

, : Lack of interhemispheric transfer of the 1 hertz suppression effect in rats. Physiological Psychology 12(3): 237-241

Three experiments were conducted to evaluate the effect of 1-Hz [hertz] brain stimulation of the amygdala on kindling behavior induced by 60-Hz sine-wave stimulation in the contralateral amygdala. In Experiment 1, the effective threshold intensity (ETI) to elicit a kindled response with 60-Hz stimulation was determined on 4 separate occasions with 15 trials between determinations (3/day) for each of 3 groups. Experimental rats in Group 1 were stimulated with 1-Hz sine waves in 1 amygdala, then with 60-Hz current in the opposite amygdala, followed by 1-Hz stimulation of the 1st site (1-60-1, OA) with 1 h interstimulation intervals. Group 2 was treated with the 1-60-1 pattern, but with all stimulation in the same amygdala (1-60-1, SA). Group 3 received only the 60-Hz stimulation trials (X-60-X), on the 2nd trial. Group 2 showed the typical suppression result, a gradual increase in threshold over the 4 ETI determinations. Group 1's responses were similar to those of Group 3: ETI values decreased gradually over the determinations. Later, when Group 1 received a set of trials in which 1- and 60-Hz current stimulation was to the same site, suppression responses occurred. Two further experiments were conducted with similar results. Apparently, the suppression effect generated by 1-Hz stimulation appears to involve a local process, an intrahemispheric effect.


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