It has been disputed whether it belongs to the voluntary or the involuntary movements, that is to say, whether it follows upon motive or stimulus, and perhaps it may be explained as something which is between the two.
eztabaidak izan dira, ea hautazko edo ez-hautazko higiduretakoa den, h. d. motiboaren ala kitzikapenaren ondorioa den propioki, horren arabera agian bien arteko gauza bat bezala azaldu ahal izango bailitzateke.