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

Ï/Ð ccntf,c1. Iio*eveE,i-h€ behavioüral system quickly
îeturnêd io +-he pre-r¡peratj,vc L€v€1 of perfornance on th€
Èäird. testr-ing sêssion, ¡iitho ut the d¿velopment of I l€sio¡-
rêlâted. nctcric chains. Thereforê it cou.1d be assumêd
that behavi.oral data dið nct suggesÈ disinhiliticn of
previously j. hibited $ctor béhal,icux,
nnlike thê studi€s {eg. fiosvold,1958i ÐiÌac, 1967,
19óB ) irhic.h en}loy€d thë s{re ccnventional tasks such as
delayed ¡êsFons€ and dêlay€d âLt+ration frontal lesions
did r¡ot proûuc€ behaviou¡a.l eff€cts rrhich are sleilar to
that of th€ caudat€ nucleus lesicn. Rather, th€ frontal
systë sàor{€il ¿ shift ct the respo¡se latel¡ci€s tc a
shortÐr yalue, resul-tisg i¡ an inc¡ease in thê relà.tivè
err,cr cf the behaÍiou.ral ststen. I+- suggests the possj.-
bility cf hyp€xxea.tivity to th€ pres€ntatioà ûf CS, The
absence of. lesrc¡-irducèd incrêase i-n trial. abort coe¡nt
{Fig¡rx€ 45 } nould lend support tÕ this ârguêñent .That
the shcrte:ned Eêsporse latênciês to ÐcÄ. coul-d not be
at tri.trì¡ t€d to aI} eoi¡aßcëd responsivity to rel{ard i-lg
stinuli sutported the conclusions of, Nej.ll et al {1974).
{B) t¡e cer€bg1i-ar control systêü:
Tle conv€ntio¡al concept cl,asssif ieå the cerebell-u!0
ês the a sçqe€nt of th€ €itËrent notor systêrq which is
regulat€d by the I hig.her t cêr¡t€rs in the cërêtrEun
{Brooks, 19?5} . The most rêc€¡t xesâarches lìoseseE teÊd.
to xecc¡rf irE Hclnesr {-1907) proFosal that the c€f êbel.lnrì
is inec]-eed j.n tbe initiaticÈ ol !ôluntaxy ¡ûovÊnent- ¡o¡
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