眶额叶皮质失活对策略转换和逆向学习的不同影响。

Differential effects of inactivation of the orbitofrontal cortex on strategy set-shifting and reversal learning.

作者信息

Ghods-Sharifi Sarvin, Haluk Desirae M, Floresco Stan B

机构信息

Department of Psychology and Brain Research Center, University of British Columbia, 2136 West Mall, Vancouver, BC, Canada V6T 1Z4.

出版信息

Neurobiol Learn Mem. 2008 May;89(4):567-73. doi: 10.1016/j.nlm.2007.10.007. Epub 2007 Nov 28.

Abstract

Different subregions of the rodent prefrontal cortex (PFC) mediate dissociable types of behavioral flexibility. For example, lesions of the medial or orbitofrontal (OFC) regions of the PFC impair extradimensional shifts and reversal learning, respectively, when novel stimuli are used during different phases of the task. In the present study, we assessed the effects of inactivation of the OFC on strategy set-shifting and reversal learning, using a maze based set-shifting task mediated by the medial PFC. Long-Evans rats were trained initially on a visual-cue discrimination to obtain food. On the subsequent day, rats had to shift to using a response strategy (e.g., always turn left). On Day 3 (reversal), rats were required to reverse the direction of their turn (e.g., always turn right). Infusions of the local anesthetic bupivacaine into the OFC did not impair initial visual discrimination learning, nor did it impair performance on the set-shift. In contrast, inactivation of the OFC did impair reversal learning; yet, these rats ceased using the previously acquired response rule as readily as controls. Instead, rats receiving OFC inactivations made a disproportionate number of erroneous arm entries towards the visual-cue, suggested that these animals reverted back to using the original visual-cue based strategy. These findings, in addition to previous data, further support the notion that the OFC and medial PFC play dissociable roles in reversal learning and set-shifting. Furthermore, the lack of effect of OFC inactivations on the set-shift indicates that this type of behavioral flexibility does not require cognitive operations related to reversal learning.

摘要

啮齿动物前额叶皮层(PFC)的不同亚区域介导不同类型的行为灵活性。例如,当在任务的不同阶段使用新刺激时,PFC内侧或眶额叶(OFC)区域的损伤分别会损害维度外转换和逆向学习。在本研究中,我们使用由内侧PFC介导的基于迷宫的转换任务,评估了OFC失活对策略转换和逆向学习的影响。Long-Evans大鼠最初接受视觉线索辨别训练以获取食物。在随后的一天,大鼠必须转而使用反应策略(例如,总是向左转)。在第3天(逆向),要求大鼠反转转弯方向(例如,总是向右转)。将局部麻醉剂布比卡因注入OFC既不损害最初的视觉辨别学习,也不损害转换任务的表现。相比之下,OFC失活确实损害了逆向学习;然而,这些大鼠不像对照组那样容易停止使用先前习得的反应规则。相反,接受OFC失活处理的大鼠向视觉线索方向做出错误手臂进入动作的比例过高,这表明这些动物又恢复到使用基于原始视觉线索的策略。这些发现,连同先前的数据,进一步支持了OFC和内侧PFC在逆向学习和转换中发挥不同作用的观点。此外,OFC失活对转换没有影响,这表明这种行为灵活性不需要与逆向学习相关的认知操作。

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