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

nucleus. Sbute altd ne¡ris {19ó3); Ordy et al, {19é9} and
llacintosh l19rì1) 'L€nd suFpcrr, to the hypothesís that. the
caudat€ BucLeus is ar¡ important structu¡e in th€ cho-
linêrgic slstên.
carLtÐn {1953} statëd that È...there ar€ infe.entÍal
gsÕunds for suçposilìg that a chol-inergic sÌ¡st€n selÈc-
tieely anÈagcìizes the êffêct Òf actiyation on ce.rtain
behayiour ãnd that tle basis af this sÐlectivity is th€
ert€nt to whi.ch that ¡)êhavio$r is r€r.ratdÐalfr. Irav.lov
{192'l } anðlyzed ûs].ayed rêstonsing into t¡lÕ phasâs of
initj.al Ínactivatior and activatio¡. Accordi¡ìg to his
analysisn th€ Fhasê of activation is closely lelatêd
t.e porall-y to th€ cns€t of r€inforcêne t (pavl_ov, 1927,1 .
¡rhile th€ C€lay is €stablj-sb€il via gradual lêngtheling of
tinê interval bet:{een th€ cns€t of CS and of reflaril. fhe
logic consist€ncy bËtr€€Ð b€havioural aDd pharûaco tr ogi_ca I
stuclies ca¡ b€ r€adily s€en. ABd ee caÐ say that,
toq€t$er $'j,tb studi€s using stj.Eulatj-orì aud lesio¡: tech-
nigues, th€ frcntäl 10¡e sTstee is cholj.nergic and
iûåibitorl in fÐnction unðe¡ aor¡oal circumstances, and j_t
is crlrcially i:¡eo1y€d irì d€layêd response and t,enporal
dela y.
Iiteratur€ si¡Fparti¡rg hytothesis II : dêlayed fêspons
and tenporä1 discrinination as a fuactiÐn of
postural nech aaisms
E¡j.le Lite¡ature suFpcrÈi¡g hypothesj-s 1
ne iliat ing
{that
33