Figure 4.
A critical level of GABAergic inhibition regulates LTP induction in dopamine neurons. a, The effects of partial blocking of GABAA receptor with bicuculline (BMI, 0.3 and 1 μM) on LTP induction in 5-7 d saline-treated rats. Scales: 5 mV, 50 ms. b, The effects of enhancing GABAA receptor activation with diazepam (DIA, 0.1 and 1 μM) on LTP induction in 5-7 d cocaine-treated rats. Scales: 5 mV, 50 ms. c, Summary graph showing concentration-dependent effects of bicuculline and diazepam on LTP induction in saline- and cocaine-treated rats. Error bars, s.e.m.