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首页> 外文期刊>The European Journal of Neuroscience >Scene perception: inferior temporal cortex neurons encode the positions of different objects in the scene.
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Scene perception: inferior temporal cortex neurons encode the positions of different objects in the scene.

机译：场景感知：颞下皮质神经元编码场景中不同对象的位置。

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Inferior temporal cortex (IT) neurons have reduced receptive field sizes in complex natural scenes. This facilitates the read-out of information about individual objects from IT, but raises the question of whether more than the single object present at the fovea is represented by the firing of IT neurons, as would be important for whole scene perception in which several objects may be located without eye movements. Recordings from IT neurons with five simultaneously presented objects, each subtending 7 degrees , with one object at the fovea and the other four centred 10 degrees eccentrically in the parafovea, showed that although 38 IT neurons had their best response to an effective stimulus at the fovea, eight IT neurons had their best response to an object when it was located in one or more of the parafoveal positions. Moreover, of 54 neurons tested for asymmetric parafoveal receptive fields, 35 (65%) had significantly different responses for different parafoveal positions. The asymmetry was partly related to competition within the receptive fields, as only 21% of the neurons had significant asymmetries when tested with just one object present located at the same parafoveal positions. The findings thus show that some evidence is conveyed by a population of IT neurons about the relative positions of several simultaneously presented objects in a scene extending well into the parafovea during a single fixation, and this is likely to be important in whole scene perception with multiple objects, including specifying the relative positions of different objects in a scene.
机译：下颞叶皮质（IT）神经元在复杂的自然场景中具有减小的感受野大小。这有利于从IT中读取有关单个对象的信息，但提出了一个问题，即是否存在多个反射物会引起IT神经元的发射，这对于在多个场景中感知多个对象的整个场景而言非常重要可能没有眼动地定位。来自IT神经元的记录有五个同时呈现的对象，每个对象都对着7度，一个对象位于中央凹处，而其他四个对象在副中央凹处偏心10度居中，这表明，尽管38个IT神经元对中央凹处的有效刺激具有最佳响应，当一个物体位于一个或多个副凹位置时，八个IT神经元对物体的反应最佳。此外，在针对不对称的副凹旁感受野进行测试的54个神经元中，有35个（65％）对不同的副凹旁位置有明显不同的反应。不对称性部分与感受野内的竞争有关，因为仅当一个物体位于相同的副凹位置时，只有21％的神经元具有明显的不对称性。因此，这些发现表明，一群IT神经元传达了有关在单个固定过程中场景中同时延伸的几个对象的相对位置的信息，这些对象在单眼注视中很好地延伸到了副中央凹，这可能在整个场景感知中很重要。对象，包括指定场景中不同对象的相对位置。

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