passages.id: split_6_test_141_passage
passages.type: progene_text
passages.text: The number of spikes thus activated was counted for the control and test conditions after application of each drug : (1) dopamine application decreased the number of spikes evoked by transcallosal stimulation ; (2) application of SCH 23390 , sulpiride and haloperidol restored these decreased spike numbers to the control level ; (3) latency of neuronal response to transcallosal stimulation was not affected by the application of either DA , SCH 23390 , sulpiride or haloperidol ; and ( 4 ) there was no significant difference between PTNs and non - PTNs in the manner of response to DA and its antagonist applications .