People who are hypnotised are paying attention to what the hypnotist is saying; they are choosing to be hypnotised and to engage in the resulting behaviour. That means their attention is still engaged and functioning, allowing the possibility of behavioural and psychological consequences from stimuli they encounter. And while there is good scientific evidence that hypnotism can help with some medical and psychological issues, there is no such evidence to suggest that it has any kind of beneficial effect on memory.
