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

¡xp€riaental aesign: the ¡€layed Conditioned Àpproach
{ÐcÀ}
¡rStructü¡a11yrr thê DCJI cãa be ðë€cri_b€d as fcllo{s:
It is a conditic¡êd açFroacb r€sponse in vhich a subject
is reguired to pEêss a L€ver fcr satêr rerãrd, but the
reward i.s nÕt available u¡tiL a c€rtain tine interval- has
lapsed sinc€ tl€ cS onset. This t:aa 1nterval b€tH€en
thð onseÈ of CS a¡d of Beinfcrceoent is the delay" g
p€rialty perjotl lÐSL conponçÐt!, tbe punishing cônpon€nt
of th€ paxadt gm starts {¡ith thê onset of CS büt Ís
ssüaLly shorter irt duraticn than thê delay sompÐnênt.
åny l€ver pr€ss€s during th€ p€nalty period tùi11 cause
i$n€iliat€ t€rEiÐâti.cî cf Èh€ CS anã thê schedul¿d reinforce*ent
F€rÍod ior tàat trial, fnm€iliately precediag
the CS caset, th€re is a ttiaf-abcrt period. fDd€scrinin¿te
lever Frêsses during the intertrial j_nt€rval and
*ithj.n the trial-abcrt period eil"1 result ån postpûneeent
of the n€¡t sch€dul€å tria1. This is the cther DRI
comFonent cf the parafliqn, Typically, at the base line
schealule the CS is 16 se{.; penalty 5 sec; delay 9
sec. ;reinforcênent 'l 6 se.; and trial- ãbort 1á sèc-
Figure 2 is a schÊnat1c diagran of the ÐCå.
IB ärlditj.Ðn, a correctioÐal sch€ðulè sas us€ð. for
DCA rrs.hapi¡g'r and as a $prûhêrto explore thê behavioural-
abnorüality Ín lesionêd rats. ghis ¡{as d.one by neans of
corr€ctional changes cf reinforcËnelìt sch€dulê {Halasz a
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