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

j.tìhj'bitcry F.rocesses Þanj.fêsted both by itebavioural
chang€s {eg. fron aL€rtlìess t. drosiDess and sleep ) and
by the occu¡reüce cf rtcaud.at€-sFindlâsr iü t.he el-eciro-
g.rån, ¡rhj.ch is a train of high voltage, rhyth,nical
osciLlatirrl, lasting 3 s€c. j-n aturati_on, uith a latency
of 150 - 200 msec. ). Bottr the -behavioural changes and
the êl€ctrical recordi-ngs cou]-d b€ disinhÍbited by ¡ove1
stiúulation. 4Õ cats s€re used i¡ acute and clironic
èxpçri$€Ilts to study the ccrtj_cal Loci ûf the caudle-
spind.le {BuchwaId et al, 19É1a} . !tith a loH intêasity
singlê shcck, 0.01 nsec. duration, at 5 sec interval, of
the caudate nucleus, ,spiûaile bursts ïèxe picked fron
seïeraL cortical aÐd subcortical- sit€s. The nost Frcminent-
place for sFi¡illÊ actieÍty ís the ipsilateral
precxuciate {antexi-ôr sigmoì-d gyrus} regÍos of the
cortex" It can also he obt.ai.neå fron contralateral
ant€rior signci.d gyrus, bcth pcsterior g1ri, nost of tìÊ
thalanus, g].obus patliilus, contralatèral caudat€ nucleus,
en tope¿uncü laxis, and septun. The cat¡datë spindìê is
elicitêd at a r€gue¡cï of 1C-12 $z and can be obtained
fron resting or sleeping aDinals and in prepâTatio[s
ex hibiti.ng r€ lati.vêly sl"c* rhythmical elect¡ocortíco-
grans. trt is thüs antagûnisti.c to f unctioni-Dg of th€
ceûtra.]- arcusal systen. In retation to rther brain
arÊâs, the authors sho*ed that €Lë {trocoagulat ion of the
tha-¡-anic ¡ucleüs "e¡tra"l-is anterior ipsilateral to th€
sj-t,e of caudate stinllLatåc¡r sutfresses {ca ud.atä -spind]-ê sfl
at thç ipsilateral cortex but contralatêtal spiadling
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