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

Buchnald et a1, 1961 {Euch¡{â1d, Wy€rs, Laup¡*cht and
Herser) 'implaÀt€d ch¡onic e1€ctroales in cortical a¡d
subcorÈ ical loci to study th€ b€hav j- c¡t¡al- ef fect"s of
stimulating the caudat€ nucl€us and ventral aeto¡io¡
aucleus of the thaLanus in cats. Depending o:ì the
stj-at¡lating paranet.ers, thê h€harioitral conseque!ìces
variêd. All- cats ï€r€ t.Eair€d tc ba¡ Fress on fB-1,
fn-4, and f8-12, and stifrulus threshol_d. ras êstaþlish€d
for each 5. SilateEal- sti-sùlatío! cf the ca¡¡date Þucleus
Has then presented ât fr€quêncies ranging fron 1 pulse/5
sec. ta 5 pul_s€ls€c. Àt th€sê freguencies thêr€ is a
st inulu s-in duce d slorr.i.ng and c€ssatic¡ of response.
¡lhiLê the loTrêa frer¡uencies taus€d a more gradual- real ¡Jc-
titB i.n rèsponse rat€ ¡efore cessatj-or¡ of bar pressing
thâ higher trêguency stinul_aÈio¡ could cause aþrüpt
terminatio¡ cf responsing i¡ the operant situation,
¡Iorever, these 5s r€nûainÊal â1êrt and ori_ented, thoügh
they seemed unccDcêrn€d rrith the 1€ver. Upoïl t€rûination
of tbe stinulaticn, Ss r€su¡ì€d lever press sith a
post -st inu lat icÐ parìse ¡rithcut any chaûge in response
ratÈ as comFared to pre-stimulati.oo bas€line rate. High
frequercy stimulation of th€ caudate at 300 pu1se,/sêc.
on thê cther band, caus€d des ynchroa izat ion of th€
caudatê-spindle uithout cha¡g€s in .overt respo¡se pât-
telnn and it fì€ver increased rate of bar pressing in
hungry Ss, StiuüLatioû of aì S prêvj,ously exhibitèd
10í-treq!¡ençy-stinulation induced cessation of respons€
caus€d tle 5 to resutnê cc¡trc1 rate of lever press"
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