Abstract
In decerebrate cats electrical stimulation (10–20 ms trains, 35–450 μA, 0.1 ms pulses, 450 Hz) in nucleus tractus solitarius (NTS, medial or lateral divisions) or nucleus raphe magnus (NRM) inhibited spontaneous or amino acid-induced neuronal activity in nucleus paragigantocellularis lateralis (PGL) for 8–140 (mean 51) ms. Iontophoretically applied GABA (2–50 nA) also inhibited these cells. Iontophoretically applied bicuculline methiodide (10–80 nA) blocked the effects of GABA and reduced the duration of the inhibition evoked from NRM by 50%( 5 6 cells ) but had no effect on the inhibition evoked from NTS ( 6 7 cells ). The results are discussed in relation to the role of GABA in mediating inhibitory afferent input to PGL.
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