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

and proLably a. ccntrÕlling tart of the cêntral &êchaBis¡t
concer¡ing oaictai$i.ng, rêgulâtirg, altd dist¡:ib¡]tiÈg
postüEa1 tcnes i.n muscles. SeccndLy, dr:ríng mose¡neÌìt it
regulatËs a¡d coordinates t'he scdifj.catiûn of tones thai
accoopany th+ rêlaxaÈion and contraction of alI nuscle
group.s dirêctly or indirectly concer¡è¿t j.â tþe so venent,
In the first caserthê c€rÊb€llu[ has a contj-¡luous and
unvarying f ur¡ctj.on Hhilê i¡¡ th€ seconð case, Íts activity
is disccnti.nuors anil ?ariable {flalnes,19221 .
lunrtioûal CÕ nsj.dêr at ions
Tn "he 1939 Faper, lìol-n€s descritred in ¿etail thê
eftects of destructige lesic¡ o{ th€ cêrebej-Ium, in nan
an il higher Fxisatês. Thê Fcst obvious effect lra Ê a
lesion-induced discrder in voluntary norêìnents, usually
called ataxia. The ft¡daq€?ta1 dÍsturba&ces iri voluntêry
noy€nent ale {'l) a dê1ay in starti¡g a sðvêment, and l2l
irregularity i.n j-ts acceleratj.oD. Thê latter ùisturtance
ras att.ibut€d to irregular in¡erration of the pTiBe
noyêrs. ïn ccnpound nov€nìents therê nay be a lack of
synchrcnicíty j-n the sepa.rãtê conponents of the novemènt,
Õuè ta tle lay in the iûj.tiation af one conponenÈ relative
to tbe otl¡êr, and. e¡cessiTÊ range of onè e}êment of tbe
noyëBert. Defective postural fixaÈior¡ ryas anÕth€r fac-
tor. the predcnì-nalce of synptofls of c4re.bellâr def,êcts
j,ûvolvês the conponeats of vo-l-uttary ¡ìrorê:!ent. fhis
phenoe€ncrì inilicatês t.hat üi.t i¡fluences directly cerebr-
al nêchaRisns ïhich excit€ and iniegrate such nov€nênts
4l