Comparative studies on hierarchical integration of visual features

本研究采用系统的方法对视觉特征进行层次化整合：1.工作记忆过程中的运动-形状和运动-颜色关联。当刺激的运动方向(垂直或水平)与实验结束时所要求的选择(色调辨别或形状辨别)唯一相关时，鸽子会根据动作选择性地记忆相关信息。为了区分一致和不同方向移动的图标的运动阵列，鸽子使用相同显示的全局图案以及单个图标的相对运动。3.深度旋转人脸的静态和动态图像的识别。动态视觉训练未能增强鸽子的视点不变性，表明鸽子没有将2D视图整合到3D对象中。4.分层视觉特征的使用。在区分卡通人物时，鸽子使用了全局和局部两个方面，这两类信息的不同混合取决于特定的感知语境。5.上位范畴成员的功能对等。已被训练对原型类别的典型样本和非典型样本进行分类的鸽子，以与原型类别的等级特征结构一致的方式，将感知上不相似的非典型样本视为功能相同。

The topics included in the present study conducted as a systematic approach to hierarchical integration of visual features are :1.Motion-shape and motion-color associations in working memory processes. When motion orientation (vertical or horizontal) of stimuli was uniquely associated with the choice required at the end of trials (hue-discrimination or shape-discrimination), pigeons selectively memorized the relevant information depending on the motion.2.SAME/DIFFERENT motion discrimination. To discriminate motion arrays of icons moving in unison and in different directions, pigeons used the global patterns of the SAME displays as well as relative motions of individual icons.3.Recognition of static and dynamic images of depth-rotated human faces. Dynamic-view training failed to enhance view-point invariance in pigeons, suggesting that pigeons are not integrating 2D views into, a 3D object.4.Usage of hierarchical visual features. In discriminating cartoon characters pigeons used both global and local aspects, with different mixtures of these types of information depending on the particular perceptual context.5.Functional equivalence of superordinate category members. Pigeons having been trained to classify typical and atypical exemplars of a prototype category treated the perceptually dissimilar atypical exemplars as functionally equivalent, in a manner consistent with the hierarchical feature structure of the prototype category.