Psychophysical evidence for a radial motion bias in complex motion discrimination
Psychophysical evidence for a radial motion bias in complex motion discrimination
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DOI：
10.1016/j.visres.2004.11.025
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发表时间：
2005-06-01
期刊：
影响因子：
1.8
通讯作者：
Vaina, LA
中科院分区：
文献类型：
--
作者：
Beardsley, SA;Vaina, LA
在一个分级的运动模式任务中，我们测量了观察者区分复杂运动模式的全局方向的小变化的能力。性能随测试运动（径向、圆周或螺旋）的变化而系统性变化，径向运动的阈值显著低于圆周运动的阈值。螺旋运动的支点是中间的。在所有情况下，阈值均低于使用平面运动的方向辨别，并且随着径向速度梯度的去除而增加，这与使用沿沿着复杂轨迹整合运动的运动模式特定机制一致。这里观察到的径向运动偏差和速度梯度的偏好与皮质区MSTd中报告的扩展运动和速度梯度的偏好相似。并可能表明在人类视觉运动系统中存在类似的神经机制。(c)2005爱思唯尔有限公司保留所有权利。
In a graded motion pattern task we measured observers' ability to discriminate small changes in the global direction of complex motion patterns. Performance varied systematically as a function of the test motion (radial, circular, or spiral) with thresholds for radial motions significantly lower than for circular motions. Thresholds for spiral motions were intermediate. In all cases thresholds were lower than for direction discrimination using planar motions and increased with removal of the radial speed gradient, consistent with the use of motion pattern specific mechanisms that integrate motion along complex trajectories. The radial motion bias and preference for speed gradients observed here is similar to the preference for expanding motions and speed gradients reported in cortical area MSTd. and may suggest the presence of comparable neural mechanisms in the human Visual motion system. (c) 2005 Elsevier Ltd. All rights reserved.