question: Compared to (NG) 4 mg dose of nicotine gum what was the result of (KI) low intravenous dose of ketamine (0.04 mg/kg) on auditory event-related brain potential – mismatch negativity (MMN) in high - hallucinations/delusions (H-HD)?
context: No significant main effects were observed for drug, gum, group, or time block