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

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

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ately iollcw:.ng ti¡û€ cut <strong>of</strong> th€ ÐÂtr d3]-ay. Àll th¡ee<br />

iût€rpcfat.sd caüilat€ stinulatictr faciLated thê effic -ency<br />

<strong>of</strong> DRt Ferf,cxnance b1' significânt1y íncEêasing th€ n€al)<br />

number <strong>of</strong> rËin<strong>for</strong>cene¡t3 pÊr r€sFonsê. <strong>The</strong> aùtho¡s tltus<br />

con.clìrd€d. Èåat tbere nas â stiFuLatico-indücê4 dis.ruptj-o¡l<br />

<strong>of</strong> noru¡a1 tiníêg process. Caudâ+-€ stj.üulation llnot only<br />

i¡hibi.ted resFonses during its occurrence blrt also oay<br />

have dis¡upt€d thê rBrìe orj.cr device ehich the ani.mals<br />

rornally utilj-zed to pEoc€ss in<strong>for</strong>eation about Èhe pas-<br />

sagë <strong>of</strong> ¡¡sstt (Ðêadvyler and $yêrs, 19701 .<br />

Chenica] S t i nü ]êt icn IxFërifents<br />

Dir€ct appLicaticn <strong>of</strong> c.Ì¡olinergic conpounds into the<br />

head <strong>of</strong> thê ca¡ldate rucl€ûs produc€d êffects sj.¡ai.lar to<br />

thosê €licitêil by eLect.rica.l srimulation" ItuIl €t at,<br />

{196?} ccmparêd the êifects <strong>of</strong> direct choli-nergic s+_ieuletio¡<br />

<strong>of</strong> th€ heaü <strong>of</strong> th€ €âu(late nucleus {ith thôse<br />

bas€d cD el€ctrical sti.nulation <strong>of</strong> !hê sane area. Thsy<br />

found that FaEal"l-€1 tc e"l€ctrical stinu]atio¡ studiès,<br />

behavicural cGnsequenc€s <strong>of</strong> cartachol rere a f,unction <strong>of</strong><br />

the tctê1 dose. Tfio qualitati!€ly dif ferelâÈ bchaviorrral<br />

patterãs €r€ cbser!ëd. ÀFFlj.catiûn <strong>of</strong> snô1l dosês {1êss<br />

than 4 tûg) <strong>of</strong> carbachal €licited xesponses ¡rhj.cà iocluded<br />

inhibitj,on ct on-qoj-ng l-€arn€d F€E<strong>for</strong>nânce al_though the<br />

animal renãin€d alert and respcnsive to sensory stieulj-.<br />

¡{j.ghêr doses {ranging f ro¡n q to less than 10 mg) cn the<br />

oth€r hand, prrdüc€d behavioural effects ¡hi-ch incluiled<br />

j-ntense xag€, sevelg auto¡cEic ðischarge end sharp drcp<br />

30

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