Source-Derivation

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Source-derivation describes minor ways in which introjects or other outsourced headmates differ from and are more elaborated than their source. They may have exomemories about events and details that are not explicitly mentioned in canon but are still part of a person's life, such as preferences for certain foods or music taste. It is a form of personality shifting.

Source-derivation may be caused by the system's mind or a soulbonder automatically or intentionally filling in such gaps in the source's personal history, if they are considered vital enough.

Related Terms
Nonsimilous describes introjects that differ from their source in a more extensive manner, in areas that actively contradict information given in source.

By a similar process, source progression may cause a member to gain additional memories, for example if information from their source is still being revealed and gets added into the member's exomemories.