Final answer:
Jeff probably can remember up to 79 digits by using a unique chunking strategy, which allows for the organization of information into manageable units, leading to enhanced memory retention beyond the normal short-term memory capacity.
Step-by-step explanation:
Jeff can report up to 79 digits in terms of racing times, which suggests that he probably can remember this information due to a unique chunking strategy. Given that the typical capacity for short-term memory is about 7 plus or minus 2 items, as noted by George Miller, and more contemporary research suggests a working memory capacity of 4 plus or minus 1, Jeff's ability to report such a high number of digits indicates a specialized memory technique.
It's unlikely that Jeff merely has a larger working memory than most people, but more feasible that through practice and use of an effective chunking strategy, he can recall a larger sequence of digits.
Chunking involves breaking down and organizing information into manageable units, greatly assisting the memory retention process. For example, phone numbers are typically remembered in chunks rather than as a continuous string of numbers. This technique enhances our ability to recall information by utilizing a structured approach, which could explain Jeff's proficient digit memory. In addition, Jeff's proficiency may involve a degree of memorization through elaborative rehearsal, tying new information to knowledge already stored in memory.