Table 1.

Frequency of anatomical and physiological characteristics in GABAergic and non-GABAergic cell groups1-a

All cellsNb+/GAD+ cellsNb+/GAD− cellsStatistic
(n = 55)(n= 21)(n = 34)χ2 (df)
 Area0.004 (1)
 Shape0.064 (1)
  Oval-fusiform (Bipolar)301119
  Polygonal (Multipolar)251015
 Size2.99 (1)
  Small (≤15 μm)303
  Medium-Large (>15 μm)522131
 Response to stimulation (PSH1-b)10.14 (1)1-165
  Increase (“on”)36828
  Decrease (“off”)18126
 Discharge pattern0.47 (2)
  Tonic and/or cluster16511
  Tonic and/or burst1046
 Low-frequency rhythmicity during stimulation (ACH1-c)2.31 (1)
  Not rhythmic351619
 Unit-to-EEG cross-correlation during stimulation (STA1-d)3.79 (1)*
  Not correlated361719
  • F1-a Frequencies (n, number of cells) for the two groups are presented and compared using the likelihood ratio χ2 statistic;

  • * p < 0.05;

  • F1-160 p < 0.01;

  • F1-165 p < 0.001.

  • F1-b Classification based on peristimulus histogram (PSH) measure of average discharge rate.

  • F1-c Based on autocorrelation histogram (ACH) values.

  • F1-d Based on unit-to-EEG spike-triggered averages (STA) with EEG from retrosplenial cortex.