This diagram [a work in progress based on Fazey and Hardy, 1988] shows how sudden shifts in behaviour can arise from small changes in circumstances [See Rene Thom – catastrophe theory]. It is used here to explain the process of how increasing cognitive and somatic anxiety might lead to feelings of depersonalisation numbness or panic attacks. Since these often result from small changes. Could this model be used to explain the experiences of hallucination and perceptual illusion?

Some links here to how this is used in sport science – in relation to somatic and cognitive anxiety/

Theory of Catastrophes

http://users.fs.cvut.cz/ivo.bukovsky/SBS/en/Catastrophes/Catastrophes1.html