[Spike activity of superior colliculus neurons following blockade of corticofugal regulation].

Changes in background and evoked activity of the superior cooliculus neurons were studied in cats before and after cessation of ipsilateral corticofugal connections. On the operated side of the brain the superior cooliculus neurons slackened their impulsation and most of them were unresponsible to light stimulation (only 7.1% neurons responded to light after operation). It is suggested that afferent inputs to superior colliculus neurons are modulated by corticofugal mechanisms.