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

N TS ü1,Ì S: THB IiISTOI.OGÏCÀL ÐJITÀ
I. blain spÐcimen of subj€cts bearirq tril-at-eral
elêctrc.lytj.c lesions iÐ the head of the caudat,e rüc1êus:
at GxNEãAl stssrrrtÀïrot¡s :
TLe da¡ûaged brain tissues corrèsponiled vell sith.the
area as dêfined by the stêreotaxic ät1as of decroêt {
'¡954), ie. anterior -1"?mn fron Bregea t + 2.7 nn lateral
to,th€ e j.dlinê, and. 5 nm frcn the surfacè of the skull.
Th€ bra5-n s.¡:ec5.Ðen !ìithi! this boun¿lary sho¡{ed danag€ to
the cortical tissues around the â.r€a vh€re the lesionir:g
€lectrod€s €r¡teË€al tb€ braiì. ilorùêverrduË to th€ €xtren€
thinÐess of t!€ sections {óu) alrd of the long pèriÐd. of
tiûe b€tu€en tbe surgeEy and the sacrific€ of thê
anlqaLs, ih€rê íêre ro alistirct tracts observable.
the lesicning curn€nt Frodüced a constricÈed areê of
damage to thê hêad cf th€ caudate nucleus. The arèa of
maxinal ðanag€ rdas soûfiriÊil tc th€ sectj.on medial to the
lateral aspect of the corpus callosusr, dorsa1 to the
anteriûr coÍnj-ssur€ aû{l ¡rentral to the nedial aspect of
the corpus callosuE" Scar tissues and deslroyed areas
{spac€) we.re readilJ obse¡va&Lê to the norßel eyË and
unaler the Eicnoscope { 4x ð 10x). Ðisarrangem€nt Õf the
corpüs callcsus düe to th€ FenetraÈion of tite electraå€
ltas also obseËYed..
B' IBEA Cf fl AXl ¡!Àt ÐÀM AG.f;:
The ar€a cf ma]{i nal damage overlapped to sone ext€nt
with tàe spac€ occupr.eal by the lateral î€ntricl€s,
creati¡q a Firtu¡e of nuch €rÌlaxged ventricular space.
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