Scene perception: inferior temporal cortex neurons encode the positions of different objects in the scene
Scene perception: inferior temporal cortex neurons encode the positions of different objects in the scene
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DOI：
10.1111/j.1460-9568.2005.04487.x
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发表时间：
2005-12-01
影响因子：
3.4
通讯作者：
Rolls, ET
中科院分区：
文献类型：
--
作者：
Aggelopoulos, NC;Rolls, ET
在复杂的自然场景中，下颞叶皮层（IT）神经元的感受野尺寸减小。这有助于从IT读出关于单个对象的信息，但提出了一个问题，即是否存在于中央凹的单个对象由IT神经元的发射表示，这对于整个场景感知是重要的，其中几个对象可以在没有眼球运动的情况下定位。IT神经元的记录与5个同时呈现的对象，每个对着7度，一个对象在中央凹和其他四个中心10度偏心在旁视皮层，显示，虽然38 IT神经元有他们的最佳反应的有效刺激在中央凹，8 IT神经元有他们的最佳反应的对象时，它位于一个或多个旁视皮层的位置。此外，54个神经元测试的不对称旁视感受野，35（65%）有显着不同的旁视位置的反应。这种不对称性部分与感受野内的竞争有关，因为只有21%的神经元在只有一个物体位于相同的旁皮层位置时具有显著的不对称性。因此，研究结果表明，一些证据是由一个人口的IT神经元的相对位置的几个同时呈现的对象在一个场景中延伸到parafterma在一个单一的固定，这可能是重要的，在整个场景的感知与多个对象，包括指定的相对位置不同的对象在一个场景中。
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.