Fig. 5.

Effect of CNQX application into the VP on the response evoked by PL/MO stimulation in an SNR cell. Fromtop to bottom, The response exhibited a triphasic excitation–inhibition–excitation sequence in control conditions; under CNQX application into the VP, the early excitation was not significantly modified, the inhibition was still observed, and the late excitation was markedly increased. The maximal effect was observed 20 min after the beginning of CNQX application, and the recovery of the late excitation occurred 75 min after the cessation of CNQX application. Note that the duration of the inhibition and the latency of the late excitation were decreased under CNQX. Each poststimulus time histogram represents 100 superimposed sweeps.Arrow indicates the stimulation artifact.