31.   This can be a critically important action as the human memory is notoriously selective, and loose-leaf and logbook notes are prone to be separated from the project plan.

32.   Those uxorial memories are very strong.

33.   Moreover, memory may be impaired for a variety of reasons, lack of initial attention is not the only possible explanation.

34.   However, for aspects of driving where memory for events is not so clearly necessary it may be surprisingly poor.

35.   At low levels of arousal it is assumed that attention is divided among many cues so there will potentially be some memory for all cues.

36.   At high levels of arousal, however, not all cues will be attended to and memory will clearly be impaired for those which were not.

37.   However, the memory is a happy one.

38.   There is old memory in snow.

39.   Sadly, negative memories are often strongest and the recollection of adequate but unexceptional four and five-star hotels merges into a chintz and marble blur.

40.   But there are positive memories too, notably of properties which showed a spark of originality.