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PubMed2004

Blocking of AMPA receptors in the central amygdaloid nucleus modulates the parabrachial nucleus taste responses in rats.

Taste responses in the parabrachial nucleus (PBN) are significantly affected by stimulation or lesion of the central nucleus of the amygdala (CeA). To examine if the glutamate receptors in the CeA are involved in this modulation, the effects of microinjection of 6-cyano-7-nitro-quinoxaline-2, 3-dione (CNQX), an AMPA receptor antagonist, into the CeA on the activities of PBN taste neurons were observed by using extracellular recording technique. Responses of PBN taste neurons to taste stimuli were observed before and after CNQX administered to the CeA. In general, drug administration produced a time-dependent suppress of the responses in 30% PBN taste neurons, with the firing rates to HCl and QHCl were significantly lowered (P<0.05). According to the best-stimulus category, 40% NaCl-best (6/15), 30% HCl-best (3/10) and 20% QHCl-best (1/5) neurons decreased their responses to at least one basic taste stimulus after CNQX injection. In HCl- and QHCl-best neurons, the main responses were significantly inhibited after drug injections (P<0.01). The correlation coefficient of responses between the NaCl and the other three tastants decreased after drug administration to the CeA. These results suggest that AMPA receptors within the CeA may be involved in the descending modulation in the PBN taste neurons.

6-Cyano-7-nitroquinoxaline-2,3-dione↗
PubMed1986

[Olfactory rhythm in the electrical activity of the amygdaloid nucleus of the human brain].

Electrical activity of human amygdala was studied by implanted electrodes at epileptic clinic. Respiration-linked spindles of 20-30 cps, 30-50 microV, 1-3 s duration were registered in response to various odoriferous stimuli. Room air was less but effective to induce this activity. The spindles seemed to emerge at the end of inspiration or the beginning of expiration and in case of monorhinal breathing or sniffing occurred in the ipsilateral structure only. Frequency analysis (within 20-40 Hz range) showed that quasisinusoidal olfactory rhythm may be expanded into sinusoidal components but no specific odour-dependent peculiarities of the rhythm were observed.

Amygdala↗