Answer:
- Less efficiently than normal.
Step-by-step explanation:
Photographic memory corresponds to recall or remember things with substantial details or in a more precise manner when they are exposed to a basic set of visual images.
As per the given description, S's memory operated would be 'less efficient than normal' as he was be able to 'achieve numerous feats of memory' and not able to reiterate the details with virtual exposure. Thus, his memory that has been operated here is less efficiently working as compared to his normal ability.