Ketamine hydrochloride (Ketaset, Henry Schein Animal Health, UK) was diluted in a normal saline vehicle to 25 mg/mL or 8 mg/mL and administered intraperitoneally (IP) at 1 mL/kg 30 min prior or immediately following conditioning training or recall trials. The resulting subanaesthetic doses of 25 mg/kg or 8 mg/kg are consistent with previous studies (Bolton et al., 2012 (link); Razoux et al., 2007 (link)).
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