In 2019, a paper from Lisa Stuart, Victoria Grahame and others at Newcastle University described how intolerance of uncertainty and anxiety may have a role in the demand avoidant behaviour of those identified as having a PDA profile.
The May 2020 edition of the journal Child and Adolescent Mental Health republished the paper alongside commentary from Jonathan Green and a response to this from the original authors.
In addition, Ann Ozsivadjian brought it all together with an editorial. In it she suggests that it will only be possible to develop suitable support when the underlying mechanisms are understood, and that also requires adequate definitions. It is hoped that the discussion will encourage further development of practical research. The full editorial is available to read here. Ann also recorded a podcast discussing PDA which is available on the ACAMH website here.