“… CDP-choline … hemicholinium-3 (1 μg; icv), the nonselective nicotinic receptor antagonist mecamylamine (50 μg; icv), the α7 selective nicotinic acetylcholine receptor antagonist α-bungarotoxin (2 μg; …), but not by the nonselective opioid receptor antagonist naloxone (10 μg; icv) and the nonselective muscarinic receptor antagonist atropine (10 μg; icv).”