[Disruption of successive specialized movements in a chain conditioned reflex after extirpation of individual fields of the prefrontal cortex in baboons].

After extirpation of the field 9 and 47 disturbances of a chain instrumental reflex appear in monkeys as a fragmentation of successive acts and simplification of the forms of manipulation with experimental instruments. Disturbances of movement forms are stable. This fact to some extent is modelling human frontal pathology which is manifested in inability to perform a series of successive movements with switching over to different forms. Extirpation of the field 10 elicits disturbances of successive act only in the initial period and further the chain reflex is fully restored. Locomotor hyperactivity dominates in the behaviour. Author's initial conclusion is confirmed that the field 10 does not participate in formation and manifestation of temporal connections and has regulating influence on the organization of complex animals' behaviour.