Psychological Harassment Information Association

Psychologists closing in on causes of claustrophobic fear - MedicalXpress (article link)

We all move around in a protective bubble of "near space," more commonly known as "personal space." But not everyone's bubble is the same size. People who project their personal space too far beyond their bodies, or the norm of arm's reach, are more likely to experience claustrophobic fear, a new study finds.

http://medicalxpress.com/news/2011-04-psychologists-claustrophobic.html