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首页> 外文期刊>Animal Cognition >Monkeys perceive the orientation of objects relative to the vertical axis
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Monkeys perceive the orientation of objects relative to the vertical axis

机译：猴子感知物体相对于垂直轴的方向

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摘要

Orientation processing is essential for segmenting contour from the background, which allows perception of the shape and stability of objects. However, little is known about how monkeys determine the degree and direction of orientation. In this study, to determine the reference axis for orientation perception in monkeys, post-discrimination generalization tests were conducted following discrimination training between the 67.5° and 112.5° orientations and between the 22.5° and 157.5° orientations. After discrimination training between the 67.5° and 112.5° orientations, the slope of the generalization gradient around the S+ orientation was broad, while the slope was steep after discrimination training between the 22.5° and 157.5° orientations. Comparing the shapes of the gradients indicated that the subjective distance between the 67.5° and 112.5° orientations was small, while the subjective distance between the 22.5° and 157.5° orientation was large. In other words, the monkeys recognized that the former and the latter distances were 45° and 135° across the vertical axis, rather than 135° and 45° across the horizontal axis, respectively. These findings indicate that the monkeys determined the degree and direction of the tilt using the vertical reference.
机译：定向处理对于从背景中分割轮廓至关重要，这样可以感知物体的形状和稳定性。但是，关于猴子如何确定定向的程度和方向的了解很少。在这项研究中，为了确定猴子定向感知的参考轴，在67.5°和112.5°定向以及22.5°和157.5°定向之间的歧视训练之后，进行了判别后泛化测试。在67.5°和1112.5°取向之间进行鉴别训练后，围绕S + 取向的广义梯度的斜率较宽，而在22.5°和157.5°取向之间进行鉴别训练后该斜率陡峭。比较梯度的形状表明，在67.5°和112.5°取向之间的主观距离很小，而在22.5°和157.5°取向之间的主观距离很大。换句话说，猴子认识到前者和后者的距离在垂直轴上分别为45°和135°，而不是在水平轴上分别为135°和45°。这些发现表明，猴子使用垂直基准确定了倾斜的程度和方向。

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