His thesis was somewhat related to this. He found that PNSE was not related to ego development, but was related to score on a mysticism scale.
But even if there is a correlation between PNSE and personality type, it doesn't tell you anything about any possible causal relationships. PNSE might be facilitated by a certain personality type or it might cause a certain personality type.
Ego Development Stage Does Not Predict Persistent
Non-Symbolic Experience
by
Jeffery A. Martin
A Dissertation Submitted to the Faculty of the California Institute of Integral
Studies in Partial Fulfillment of the Requirements for the Degree of
Doctor of Philosophy in Transformative Studies
California Institute of Integral Studies
San Francisco, CA
2010
...
Abstract
Non-symbolic experiences have been reported for millennia and generally
attributed to spiritual and religious contexts, although atheists and agnostics also
report them. Popular terms for them include: nondual awareness, enlightenment,
mystical experiences, peak experiences, transcendental experience, the peace that
passeth understanding, unity consciousness, union with God, and so forth. Most
are temporary, but some individuals report a persistent form of them. Some
scholars have argued that these experiences represent advanced stages of human
development and placed them atop existing levels in various domains of
developmental psychology such as cognitive or ego development. There is little
evidence for this view. Moreover, several problems with it are pointed out in the
present work.
The primary goal of this study is to test the above taxonomy by comparing
ego development and Mysticism Scale measurements from a diverse population
of individuals who report persistent non-symbolic experience.
This investigation
first hypothesized that individuals who report persistent non-symbolic experience
would exhibit a range of psychological developmental levels, specifically tested
here as a composite, ego development, using the Washington University Sentence
Completion Test (WUSCT). Second, it hypothesized that individuals who report
persistent non-symbolic experience would score higher on Hood's Mysticism
Scale than those who do not report such experiences. Third, it hypothesized the
absence of a simple or linear relationship between scores on the WUSCT and
Mysticism Scale for those who report non-symbolic experience.
These hypotheses were examined in 36 adults (F=9, M=27) reporting
persistent non-symbolic experience.
The first hypothesis was supported: ego
development stages ranged from 5 (Loevinger and Cook-Greuter's "Self Aware"
stage) to 10 (Cook-Greuter's "Unitive" stage). The second hypothesis was also
supported: average and median Mysticism Scale scores notably exceeded those
reported in studies of other populations. The third hypothesis could not be
adequately tested because the Mysticism Scale score distribution was strongly
skewed upwards, making most statistical comparisons unworkable.
Overall, this
study provides the first strong evidence that persistent non-symbolic experience
does not represent higher levels of ego development.
This video by Dr Martin discusses the question further.
The playlist containing that video has interesting background on PNSE
https://www.youtube.com/playlist?list=PLPjd37sU1TTjuNgQmukfpJkPdwCb98O1F