Table 1.

Firing patterns of neurons of various neurochemical phenotypes

GAD+PV/GAD+ChAT+Undetermined
Neurons recorded during hippocampal theta (n = 46)Burst-firing18.3 ± 2.026.5 ± 2.5*
15/23 12/12
Tonic-firing27.1 ± 0.615.6 ± 3.2
2/23 2/7
Cluster-firing8.6 ± 1.312.9 ± 6.1
4/23 2/7
Slow-firing3.0 ± 0.50.6 ± 0.31.4 ± 0.9
2/23 4/4 3/7
Neurons recorded in the absence of hippocampal theta (n = 16)Burst-firing
Tonic-firing16.5 ± 3.223.0 ± 5.0
3/9 2/4
Cluster-firing11.1 ± 2.57.0
6/9 1/2
Slow-firing2.3 ± 0.30.31.0
2/4 1/1 1/2
  • Data are from urethane-anesthetized rats. Bolded values indicate the number of neurons. Other values are average discharge rates (spikes/s) ± SEM.

  • *p < 0.05 compared with GAD-IR burst-firing neurons.