Abstract:
:In two separate experiments we addressed the involvement of the rat's prefrontal cortex in mediation of the sequential ordering of the "components of behaviour". In both experiments the animals were required to operate two different and spatially distant manipulanda sequentially. While in the first experiment a light cue signalled which response would at any moment be appropriate no sensory cues offered procedural guidance during the second experiment. Both experiments focused on postoperative retention performance. In the first experiment we studied the consequences of ablation of the dorsal anteromedial cortex, the total anteromedial cortex and the suprarhinal cortex as compared to a sham operated control group. In the second experiment we compared a sham operated group to a group subjected to ablation of the total anteromedial cortex. While the proficiency of task performance was evaluated on the basis of the number of reinforcements obtained and the percentage of bar presses to be reinforced, additional analysis of behaviour included registration of the individual behavioural components and the sequential orders in which these were observed. The major findings were: (1) lesions within the anteromedial, prefrontal cortex (especially if including the ventral part of this region) are associated with significantly impaired performance of both the presently investigated tasks. (2) The demonstrated association between the anteromedial cortex and the mediation of the sequential arrangement of behavioural components does not seem to be secondary to changes in neither quality nor frequency of any individual behavioural component. (3) In the first experiment--where a cue light signalled which response would at any point in time be adequate--lesions within all parts of the prefrontal cortex (the suprarhinal as well as the anteromedial cortex) were associated with overproduction of errors, which in the behavioural sequence analysis had been characterized as "type B". We tentatively interpret such errors as reflecting a failure to utilize the visual cue offered by the signal lamp. Since lesions within all parts of the prefrontal cortex seem to be associated with "cue utilization" failures while only lesions involving the anteromedial cortex are reflected in impaired sequential arrangement of behavioural components the present studies seem to reflect a certain degree of functional specialization within the prefrontal cortex of the rat.
journal_name
Behav Brain Resjournal_title
Behavioural brain researchauthors
Mogensen J,Holm Sdoi
10.1016/0166-4328(94)90054-xsubject
Has Abstractpub_date
1994-07-29 00:00:00pages
89-100issue
1eissn
0166-4328issn
1872-7549pii
0166-4328(94)90054-Xjournal_volume
63pub_type
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