Im late coming to this thread, I also admit I havent read this whole thread so please excuse me if I repeat whats already posted...

one time my therapist and I noticed I would sometimes draw strangely. out of curiosity the next time she caught me in my pre verbal dissociated state, she gave me the HTP test.

this test is not given to adults in america, Adults are given the Scholastic Achievement Test and a full battery of psychiatric evaluations)

HTP stands for House, Tree, Person psychological intelligence test. this test is given to pre school, head start and in coming kindergarten children as a school screening test by school psychologists to see whether the incoming kindergarten child is going to need special academic or psychological help.

one thing about this test is that its easily invalidated. a treatment provider knows instantly if the client is faking the pre verbal alternate personality. this test is deceptively simple. the client is asked to draw a house, tree and person. but there is much more involved with scoring the test then just what is drawn. yes you can find older, incomplete and outdated versions of this test online but the new tests are different. example this test was invented in 1948, some updates on line is from 1969-1970. the new test was updated in 2013. obviously what humans considered to be part of normal life, normal accademic standards for preverbal and preschool children has changed over the years. a shakey leafless tree no longer means the child is 2 years old with no social life or ego. it could mean anything from the child watched a construction crew cut down a tree or their tree in their back yard shook when they swung \ climbed on it when they were 8 years old to a teen ager who got scared while sitting in the tree and the wind blew the leaves off the tree.

my point this test takes into consideration much now then it used to and what you find online. if a person copies what they find online the treatment provider instantly knows the pre verbal alternate personality is faked.

At the same time my treatment provider gave me the PPVT and the PIAT (tests similar to the SAT's but for pre verbal through 5-12 year olds. pictures and sight words.)

so back to my taking the tests while in a preverbal altered state of mind. what the test showed my therapist was that yes I was showing I was preverbal and infant- toddler- pre school level it more pointed to the fact that the alter was older but was the embodiment of the emotion of fear. That alter held everything that was fear. so of course they appeared pre verbal infantile, drew a baby like blob with no hands, fingers, toes, legs mouth, because that alter was afraid to talk afraid to move, afraid to hear, see....

my suggestion is maybe your treatment provider can give you the tests like the new updated HTP and the PPVT, PIAT when she sees you are in this pre verbal altered state of mind. it can give you a way to communicate with you\that alter and also find out if this alter is selective mute or mute due to trauma \ embodiment of an emotion but older then enfantile \ ... my point it may give you the answers you are looking for.