Psychobiological research on Dissociative Identity Disorder (DID): A methodological note

Area of Science:

• Psychology
• Psychophysiology
• Clinical Psychology

Background:

• Discussions on dissociative identity disorder (DID) often debate whether identity states (alters) are metaphors or genuine.
• Some studies suggest physiological differences between alters, leading to the conclusion they are more than metaphorical.
• This research questions the interpretation of such findings.

Purpose of the Study:

• To challenge the interpretation of psychobiological findings in dissociative identity disorder (DID).
• To demonstrate that physiological differences can be simulated by non-clinical populations.
• To highlight the need for specific control groups in DID research.

Main Methods:

• An experimental design was employed to test the simulation hypothesis.
• Normal subjects were instructed to simulate identity states (alters).
• Physiological profiles associated with these simulated alters were measured, with a focus on fantasy proneness.

Main Results:

• Normal subjects successfully simulated alters with distinct physiological profiles.
• Fantasy-prone individuals showed a particular ability to simulate these physiological differences.
• This indicates physiological variations may not exclusively point to genuine alters in DID.

Conclusions:

• Psychobiological research on dissociative identity disorder (DID) must incorporate normal control groups.
• Including fantasy-prone individuals as controls is crucial for accurate interpretation of alter-related psychophysiology.
• Failure to use appropriate controls may lead to uninformative research findings regarding alter activity.