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

tu¡€s. Co¡ìsequently àher€ Hêre son€ sparing of. the
caudat-€ rì€uro¡s. Tbêrefore it is ccnceivable tbat ta
sone êxtent thère iras functl.onal r€covery in tb€ caudate
¡èurons. That th€ r€covery cas not coûpletè is shot{n by
the failure of the Ii CÐ to returÐ to Ì:asel:íne perfo'rnance
on tiê DCA after rêmoval of th€ 1/O coDtrol{c. f., }.igure
lJì.
Cauilat€ nìlclêus a¡d act inhibition {Stanley &
Jaynesr concêpt ot ôct inhiþitioÐ): Tf one accepts
tlalaszts {1969} arguenent that palrloyian inhibiti-on of
delay devêl,cps in th€ ÐCA,thç! th€ origi¡a1 tone CS,
together üJith tb€ 5tr or 9{, of dè1ay acquired an inhibi-
tof,y gual.it]. thus thê first 5s or 9r' cf th€ Cs duration
act€d. as a physj.cl-cgjcaL stiuulus for the subsêq eÌìt
peEiod af actj.vi-ty. Lev€r Fr€ss€s sl¡ou]-il increase as the
reínforcene.nt availabj.lity perioil approachÐð. The datâ
fron the H CÐ Ss shoqed that subsËqnent to the inÍtial
sessicn of naûy nonlesp{rns€s Èo the CS afte,r the lesion"
Ss developed a paÈterned ûctoric chain to nêtliatè the
C5-SÐ interval. Such noto¡ic chains !r€rê coûcollnitènt to
improrred perfornance on thê ÐcÀ, As presênted in thè
rêsïlts secticn, the conpoÐents of the noÈoríc chain sere
tanticiFatory gûa1 bêhayiouE r nhich Íere prêsent iluring
the prelininary trainisg but rdere l-ater . inhibitedr in
tàat Ss refrain€al fro& responding during the delay period
.in the ÐCÀ. tesi-ons in th€ do¡sa1 and dorsomeilia]
â.spects of the U CÐ p{:êsunìabl-y ploduced the disinhibition
of the Eûtcric eveùts,as shoÍrnbby theppost -operat íve
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