The EffĘcts of In Partial 3ėĄLfil1n€nt of Tle B€qüireûents for Eh ...

devel,opüe3t of the ccllat€ral b€havioüral chains {tab}e
't) . Presuüa¡-l-y c{mp€nsatcry nctoric chairìs He rÈ Èhen
dêveloped, util.izing the cisinhibl_t€d notof,Íc sequetrcas to
flediat€ th€ d€lat. Ãl-1, th€s€ €vents took place r{he4 the
I/O cc¡txcL sas in €f,fect. persêyeration of thê condi-
ti-oned behavicu¡ idas nan1f€stêd ¡ihen the Ss fail_ed Èo
readjüst tl€ir rêsponse l-at€nci€s upor thê reBoval of the
superiu¡:osed I/O co¡tro]' . The aFparent i-nproved pèrfox-
ance cf the ¡l CD 5s ôe th€ DCA, and in particüla¡, of
maiBtained in¡roved perfornanc€ vben thê I/o co¡trol sas
lemovedcoul¿t bê attrj-buted to the failure of th€ dêfêc-
tive sysiee to oeef,cÕ&e the initiaL behavioural set. The
appar€nt facilif-atcrf efË€ct of the H cÐ Lesion cor¡1d
thus tle a masked fore of b€havi.f,a¡al perseveration. The
post-operativ+ performance of the ¡t cD group co!¡ld bê
eotoric disinhibitio¡ r¡hi-ch facilit.at.ed tÌìe forû¡atiorì of
qì€dj"ati.ng behayi.ouraL cbaiã du¡i4E the delay period i¡
the DCÀ.The absence of reducticn iÉ responsë latencies
shen I/{} co trcL eas nf lcnger in êffect could be a
result cf, impaif,nent to tiê c€¡:t¡al neuro¡al feêdbâck
loops essenti¡l tc prop€r adjustment of the systen to
chaages in rt,inj.ngr " Th.is d€fectiv€ systeü respoRd€d to
tàe controL deúand rith an initi_a1 ove¡shcot of an
u¡derdanp€ð systee and th€D precipitated into a hard
limÍt cycle, nhich j.s an lnvari-ant state of t.he conåi-
ticned beha¡iou¡,
p c st-û Íerativel-y the p c, lesio¡¡eil systen also
shoeed an initial und€xda¡içed adjust. ent. ûn the ÐcÀ ¡rith
212