The title of a song is on the tip of Gerard's tongue, but he cannot recall it until someone mentions the songwriter's name. Gerard's initial inability to recall the title was most likely caused by

retrieval failure

Explanation: Retrieval failure is the difficulty encountered when trying to recall a piece of information from long-term memory without the correct cues or triggers. In the case of Gerald, the title of the song was already in his memory but he could not recall it until someone mentioned the songwriter's name. For Gerald, the name was the retrieval cue or trigger for him to access his memory for the title of the song.

Retrieval cues or triggers are the other information or situation which occur at the time an information is stored. There are a wide range of retrieval clues and they may be locations, smell, sound, a name etc. Such information, while still stored in the memory may not be accessible in the absence of such cues.

well since twins have about the same dna they dont have one think in common which is the figer print. nobodys fingerprint is the same. if your using twin you would most likely get around the same results for both of them because of the genetics.. i hope this