?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Epigenetic+catalysis+in+an+evolutionary+context&rft.creator=Wallace%2C+Dr.+Rodrick&rft.subject=Evolution&rft.description=Recent+work+by+Ciliberti+et+al.+finds+the+spinglass+model+of+regulatory+gene+networks+adapted+from+neural+network+studies+to+have+a+single+giant+connected+component+in+a+metanetwork+space+of+interaction+matrices%2C+permitting+only+gradual+evolutionary+transition%2C+in+conflict+with+empirical+studies+of+development+in+sea+urchin+species+that+found+evidence+for+punctuated+equilibrium+evolutionary+transition.+Shifting+perspective+from+the+highly+parallel+matrix+space+to+the+grammar%2Fsyntax+of+the+time+series+of+expressed+phenotypes+via+a+recently+introduced+cognitive+paradigm+permits+import+of+other+techniques+from+statistical+physics+to+the+study+of+gene+expression%2C+in+particular+application+of+Landau's+spontaneous+symmetry+breaking+arguments.+This+produces+a+straightforward+multi-component+model+generating+punctuated+equilibrium+in+the+evolution+of+development.+Analogs+to+Bennett+and+Hacker's+mereological+fallacy+and+to+Krebs'+sufficiency+failure+that+haunt+neural+network+models+of+high+order+cognition+also+severely+constrain+the+usefulness+of+spinglass+models+in+the+study+of+gene+expression+dynamics.+Our+methods%2C+by+contrast%2C+permit+incorporation+of+epigenetic+effects+in+a+highly+natural+manner%2C+finding+them+analogous+to+a+tunable+enzyme+catalyst+in+a+process+also+subject+to+phase+transition+analogs.&rft.date=2009-01-02&rft.type=Preprint&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Fcogprints.org%2F6314%2F1%2Fspin10.pdf&rft.identifier=++Wallace%2C+Dr.+Rodrick++(2009)+Epigenetic+catalysis+in+an+evolutionary+context.++%5BPreprint%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F6314%2F