head in up to your diagram

"We report two experimental studies on the potentially detrimental
effects of nonshared, external representations in an instructional
setting. Domain experts viewing an external representation responded
to E-mail inquires for medical advice written by people who were
unable to see this external representation. Based on research on
expert–layperson communication, we predicted that the experts'
extensive and highly integrated knowledge of their own domain would
make it very difficult for them to comprehend the completely different
perspective of a layperson. We assumed that such a one-sided immersion
in one's own privileged knowledge would be exacerbated by the
availability of external representations (e.g., diagrams of body
functions). Results confirmed that visualizations making the subject
matter immediately evident for the expert did have such a detrimental
effect." -- "Explaining with nonshared illustrations: How they
constrain explanations" (abstract), by Regina Jucks, Rainer Brommea
and Anne Rundea
Sadly I seem to suffer from this problem quite a lot ><