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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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fashioD. Ècberts stat€d tbat tbe €.xtrapyramidal systen,<br />

includirrg t.he .trat€ral h€ßisfhere cf the cerebel_Lum<br />

appeaE€d to b€ ccnc€rn€d Tith t*ê rletailêd coordination<br />

<strong>of</strong> af1 parts <strong>of</strong> the bod] tc l:royi¡I€ a steâdy base fö¡<br />

pEêcise voluntary no veneats,<br />

snj.de {195C) stat€d that the nsïêr conrept <strong>of</strong> the<br />

cer.€be1.lûs .incl-udëd c€rebellar action ir danpening a rial j-Ð<br />

potêûtiating associaterl senscry atil notor centers. It is<br />

thê rrgreatêr üodulator{ ct n€urologi-c functicn. Be<br />

report€d that. thê tactile" auditory and visual areas Õf<br />

thê ceÍebêlluÐ have a ilual prajecÈion, one frcn the enil<br />

organ a$il aBÐtlìer frcm similar areas sithiq t.he cèEebrus.<br />

<strong>The</strong>se cer+bë1lar ar€as proj€ct back to. tàâ projection<br />

arèas on the c€tebrum. Sinilar ar!angement also erj-sis<br />

betuÈen cer€bêllüm and thal-anus aBð th€ basal ganglia.<br />

Thus it is â s€:f -Eegul-ati¡g feeð-Lack circ€it, aildiÐg cx<br />

sütltracting total effect <strong>of</strong> aff€r€nt voll_èy to functio.nal<br />

areas. Hor€"êr ,tr?arts and Thach {1969} on th€ othe.r<br />

hanal, fayo! Eore th€ hypotb€sis ihat the lateraL zone <strong>of</strong><br />

thè cerebellun does &st tcrn reciproca.l connection nith<br />

íts cerebral affereûts. fnstèêd, it sends oütput to the<br />

sensorinctcr corteã and possibly initiate activity thèrê.<br />

$n tL€ lrh<strong>of</strong>€ the oütFut f;ath¡{ays <strong>of</strong> th€ l-ateral cerebÈI-<br />

1a¡ zooe ar€ slill rot lr€11 urdêrstooil.<br />

<strong>In</strong> bis Crconian lectu¡€s, ltol.mÈs {1922} presented<br />

the hyFothesis ihat cerebêllun p!,ays tto disti¡¡ct tbougå<br />

closel-y alliëd roles iÐ ¡ìorr€nêlt. firstll', it is a part,<br />

40

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