?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Research+with+twins%3A+The+concept+of+emergenesis.&rft.creator=Lykken%2C+David+T.&rft.subject=Evolution&rft.subject=Evolutionary+Psychology&rft.description=Preliminaty+findings+from+an+on-going+study+of+monozygotic+twins+reared+apart+(MZA)+and+data+from+a+larger+sample+of+twins+reared+together+(MZT+and+DZT)%2C+indicate+a+surprisingly+strong+influence+of+genetic+variation+on+aptitudes%2C+psychophysiological+characteristics%2C+personality+traits+and+even+dimensions+of+attitude+and+interest.+For+some+of+these+variables%2C+MZT+and+MZA+twins+show+high+intra-class+correlations+while+DZT+twins+are+no+more+similar+than+pairs+of+unrelated+persons.+It+is+suggested+that+such+traits+are+%C2%93emergenic%2C%C2%94+i.e.%2C+that+they+are+determined+by+the+interaction--rather+than+the+sum--of+genetic+influences.+Emergenic+traits%2C+although+perhaps+strongly+genetic%2C+will+not+tend+to+run+in+families+and+for+this+reason+have+been+neglected+by+students+of+behavior+genetics.+For+this+and+several+other+listed+reasons%2C+wider+use+of+twins+in+psychological+research+is+strongly+recommended.&rft.date=1982&rft.type=Journal+(Paginated)&rft.type=PeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Fcogprints.org%2F774%2F3%2F87.pdf&rft.identifier=++Lykken%2C+David+T.++(1982)+Research+with+twins%3A+The+concept+of+emergenesis.++%5BJournal+(Paginated)%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F774%2F