The scenario of Barney remembering his area code through his former area code is an example of elaborative rehearsal.
Elaborative rehearsal refers to an action involving the linking of information to knowledge already stored and repeating the information.
For instance, if one can remember that 200 is the area code for New york and the person you met is from New york, this can help one better remember the 200 area code.
Similar way is what Barney use to remember his area code through his former area code.
Therefore, this type of rehearsal is an example of elaborative rehearsal.
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