Pollmann Stefan, Eštočinová Jana, Sommer Susanne, Chelazzi Leonardo, Zinke Wolf
Department of Experimental Psychology, Otto-von-Guericke University, 39106 Magdeburg, Germany; Center for Behavioral Brain Sciences, 39016 Magdeburg, Germany.
Department of Experimental Psychology, Otto-von-Guericke University, 39106 Magdeburg, Germany; Department of Neurological and Movement Sciences, University of Verona, 37134 Verona, Italy.
Neuroimage. 2016 Jan 1;124(Pt A):887-897. doi: 10.1016/j.neuroimage.2015.09.040. Epub 2015 Sep 30.
Spatial contextual cueing reflects an incidental form of learning that occurs when spatial distractor configurations are repeated in visual search displays. Recently, it was reported that the efficiency of contextual cueing can be modulated by reward. We replicated this behavioral finding and investigated its neural basis with fMRI. Reward value was associated with repeated displays in a learning session. The effect of reward value on context-guided visual search was assessed in a subsequent fMRI session without reward. Structures known to support explicit reward valuation, such as ventral frontomedial cortex and posterior cingulate cortex, were modulated by incidental reward learning. Contextual cueing, leading to more efficient search, went along with decreased activation in the visual search network. Retrosplenial cortex played a special role in that it showed both a main effect of reward and a reward×configuration interaction and may thereby be a central structure for the reward modulation of context-guided visual search.
空间情境线索反映了一种偶然的学习形式，当空间干扰物配置在视觉搜索显示中重复出现时就会发生这种学习。最近，有报道称情境线索的效率可以通过奖励来调节。我们重复了这一行为发现，并通过功能磁共振成像（fMRI）研究了其神经基础。奖励价值与学习过程中的重复显示相关。在随后没有奖励的fMRI实验中评估了奖励价值对情境引导视觉搜索的影响。已知支持明确奖励评估的结构，如腹侧额内侧皮质和后扣带回皮质，受到偶然奖励学习的调节。情境线索导致更有效的搜索，同时视觉搜索网络中的激活减少。压后皮质发挥了特殊作用，因为它既显示了奖励的主效应，又显示了奖励×配置的相互作用，因此可能是情境引导视觉搜索奖励调节的核心结构。
