| Figure 6. |
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| Comparison of norepinephrine (NE) and 5-hydroxytryptamine (5-HT) effects on responses to glutamate (Glu) and acetylcholine (ACh) for the same LC neuron. NE applied iontophoretically (at hatched bars) inhibits basal activity but leaves responses evoked by Glu (applied at solid circles, upper trace) or ACh (applied at solid bars, lower trace) intact. In contrast, 5-HT (iontophoresed at open bars) does not affect basal discharge rate but attenuates responses to Glu (upper trace). Note, however, that in the same neuron 5-HT does not attenuate responses to ACh (lower trace). Calibrations: abscissae, number of spikes per 5 sec; ordinates, 2 min. For more details see ref. 40. |
published 2000