Prevention of explicit memory function for intraoperative events (i.e., awareness with recall [AWR]) is a key deliverable for every general anaesthetic. Development of monitoring technologies, drugs, and anaesthetic techniques to achieve this objective is an important priority of contemporary anaesthesia research. The volatile anaesthetic concentrations associated with lack of memory function in the unstimulated state (i.e. MAC-amnesia) are not well known. This pilot study aimed to estimate MAC-amnesia using a variation of the continuous recognition memory task (CRMT). We hypothesised that MAC-amnesia would be slightly lower than MAC-awake.1
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