volume 22, issue 3, P493-515 1998
DOI: 10.1080/016502598384243
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Abstract: R ich a rd P . D e Sh o n , R o b e rt E . P lo yh a rt , a nd J o sh u a M . Sa cco M ichigan S tate U n iv ersity , U SA R e qu est s fo r r e pr ints sh ould be se n t to D r R icha rd P . D e Sh on, D e p a r tm e n t o f P sych olo gy, P sycholo gy R ese ar ch Bu ild ing, M ichigan St ate U n ive r sity, E a st L an sin g, M I 48824-1117; e -m a il: de sh on@p ilo t.m su .e du c 1998 T he I nte rn ationa l So ciety fo r the St u dy of B eh aviou r a l D e ve lop m e n t