Baker Chris I, Behrmann Marlene, Olson Carl R
Center for the Neural Basis of Cognition, 115 Mellon Institute, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, USA.
Nat Neurosci. 2002 Nov;5(11):1210-6. doi: 10.1038/nn960.
Here we investigated the impact of visual discrimination training on neuronal responses to parts of images and to whole images in inferotemporal (IT) cortex. Monkeys were trained to discriminate among 'baton' stimuli consisting of discrete top and bottom parts joined by a vertical stem. With separate features at each end, we were able to manipulate the two parts of each baton independently. After training the monkeys, we used single-cell recording to compare neuronal responses to learned and unlearned batons. Responses to learned batons, though not enhanced in strength, were enhanced in selectivity for both individual parts and for whole batons. Whole-baton selectivity arose from a form of conjunctive encoding whereby two parts together exerted a greater influence on neuronal activity than predicted by the additive influence of each part considered individually. These results indicate a possible neural mechanism for holistic or configural effects in expert versus novice observers.
在此，我们研究了视觉辨别训练对颞下（IT）皮质中神经元对图像局部和完整图像反应的影响。猴子接受训练，以区分由垂直杆连接离散顶部和底部部分组成的“指挥棒”刺激。由于两端具有独立的特征，我们能够独立操纵每个指挥棒的两个部分。在训练猴子之后，我们使用单细胞记录来比较神经元对已学习和未学习指挥棒的反应。对已学习指挥棒的反应，虽然强度没有增强，但在对单个部分和整个指挥棒的选择性上都有所增强。整个指挥棒的选择性源于一种联合编码形式，即两个部分共同对神经元活动产生的影响大于每个部分单独考虑时的相加影响。这些结果表明了专家与新手观察者中整体或构型效应的一种可能神经机制。
