“As an undergraduate student in psychology, I was taught that multiple personalities were a very rare and bizarre disorder. That is all that I was taught on ... It soon became apparent that what I had been taught was simply not true. Not only was I meeting people with multiplicity; these individuals entering my life were normal human beings with much to offer. They were simply people who had endured more than their share of pain in this life and were struggling to make sense of it.”
― Deborah Bray Haddock, The Dissociative Identity Disorder Sourcebook
Switching refers to one alter taking control of the body at the expense of another alter, being given control by another alter, or gaining prominence over another alter.
Switches can be consensual, forced, or triggered. If two alters choose to switch with one another, they usually have some degree of coconsciousness with each other and could both choose to remain at front, or actively aware of the outside world, after the switch. However, even with consensual switches, the alter who takes a step back, so to speak, may then retreat inside for whatever reason. A subtype of consensual switches are planned switches that were agreed upon ahead of time. For example, the host may ask a more academic alter to help them to take a standardized test on a certain date. On the other hand, a switch that is forced is not wanted by one of the alters involved. It may be that the alter that was at front has unexpectedly retreated, requiring another alter to quickly take control of the body in order to prevent injury, embarrassment, or other such problems or that the alter who is switching out is pushing past a weaker alter against their wishes. Finally, triggered switches are not desired by any of the alters involved and occur when stimuli has been registered that forces out an alter who can better handle it. For example, if an alter was created to handle abuse from a specific perpetrator and the system then runs into that perpetrator at the store, that alter is likely to be shoved to front so that no other alters can be hurt.
It should be kept in mind that some systems use the term trigger to refer to both positive and negative stimuli that can catch an alter's attention. For example, ducks at the pond could be a trigger for a 7 year old alter to push their way to front, or someone calling who is a special fried for one alter in particular might trigger that alter to switch out. However, as some systems do only use the term trigger to refer to negative stimuli that causes a dissociative or posttraumatic reaction, care should be taken in using the term positively.
Switches can be slow, quick, or uncontrollably rapid. Slow switches are usually consensual switches in which two or more alters are co-conscious to varying degrees and slowly blending and retreating to allow one alter to gain prominence. Slow switches can also indicate that the system is heavily dissociated and depersonalized and that alters are struggling to connect with the mind and body. In contrast, quick switches can be consensual, planned, forced, or triggered. Triggered switches are especially likely to be quick, but too many triggers or too much overall stress can also lead to rapid cycling. Rapid cycling, sometimes called rolledexing or carousel-switching, is when multiple alters are shoved to front in quick succession. This can involve several alters fronting over the course of an hour or even within a few minutes! It can be highly disorienting for those involved and can interfere with memory formation, concentration, and remaining covert and unobvious.
Some indicators that a switch may be about to occur include the following: feeling "spacey", depersonalized, or derealized; blurred vision; feeling distanced or slowed down; feeling an alter's presence; or feeling like time is beginning to jump (indicating minor episodes of time loss).
External signs that a switch may have just occurred include the following: heavy blinking as if the individual is just waking up; mild muscle spasms or jerks; disorientation or visible confusion; checking the clock or one's watch; seeming not to remember anything that just happened; complaining of a mild or moderate headache; adjusting clothing or posture; clearing one's throat before speaking so that the tone or pitch changes; or a change in vocabulary, syntax, preference, opinion, temperament, skills, or general personality.
A full switch is rarely necessary. Instead of an alter switching to front, they can exert passive influence on the alter currently at front. Passive influence can be described as intrusions from alters that are not currently prominent in the mind or using the body. This may manifest as ego-alien thoughts, feelings, emotions, opinions, preferences, urges, or actions. These intrusions may vary in strength and influence and may result in the fronting alter taking actions or voicing opinions that they can't explain or account for. These intrusions may also cause the fronting alter to gain skills and abilities that they do not usually have (such as public speaking despite normally suffering from social phobia) or losing skills and abilities that they would expect to always be there (such as reading or recognizing loved ones). Memories that are transmitted through passive influence may not remain once the influence is over, leaving the fronting alter unable to recall what the memory contained. On the other hand, passive influence may also lead to certain memories, emotions, sensations, or views becoming inaccessible to the fronting alter until the influence ends.
Passive influence is more common than switching, and it is far more covert and hard to notice. Even switching is rarely as blatant or extreme as the media commonly portrays. It is rarely accompanied by an alter changing what clothing the system is wearing, announcing themselves in public or to anyone but close friends who have expressed previous interest in knowing which alters is out, or extreme whiplashes in behavior or personality. Most systems will go to great lengths to hide their condition. Denying and downplaying symptoms as much as possible is common.