Cardinal axes for radial and circular motion, revealed by summation and by masking
Cardinal axes for radial and circular motion, revealed by summation and by masking
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DOI：
10.1016/s0042-6989(00)00276-5
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发表时间：
2001-02-01
期刊：
影响因子：
1.8
通讯作者：
Ross, J
中科院分区：
文献类型：
--
作者：
Burr, DC;Badcock, DR;Ross, J
电生理学和心理物理学研究都表明存在专门用于分析光学行的探测器。然而，尚不清楚这些探测器是否被调谐到特定的“基本方向”（例如径向和圆周运动），或者它们是否对光流运动的所有方向（包括中间螺旋运动）做出相同的响应。这里报道了运动相干灵敏度的求和和掩蔽研究，表明光学行可以调整到径向和圆形基本方向。在螺旋运动的两个正交方向之间发现了强求和。但径向运动和圆周运动之间的总和要弱得多。由于正交螺旋运动始终包含共同的径向或圆形分量，因此这些运动的更强求和意味着探测器被调谐到径向和圆形方向。类似地，最有效的掩蔽刺激（放置在车针附近，而不是叠加在测试刺激上）往往是径向或圆形方向的刺激，即使对于螺旋目标也是如此，这进一步表明流场运动是通过调整到这些“基本”方向的机制来检测和区分的。 (C) 2001 Elsevier Science Ltd. 保留所有权利。
Both electro-physiological and psychophysical studies point to the existence of detectors specialised for the analysis of optic Row. However, it is unclear whether these detectors are tuned to specific 'cardinal directions' (such as radial and circular motion), or whether they respond equally to ail directions of optic-flow motion, including intermediate spiral motions. Here summation and masking studies of motion coherence sensitivity are reported that suggest that optic Row may be tuned to radial and circular cardinal directions. Strong summation was found between two orthogonal directions of spiral motion. but much weaker summation between radial and circular motion. As orthogonal spiral motions always contain a common radial or circular component, the stronger summation for these motions implies that detectors are tuned to radial and circular directions. Similarly, the most effective masking stimuli (placed adjacent to bur not superimposed on the test stimuli) tended to be those in the radial or circular directions, even for spiral targets, further suggesting that flow-field motion is detected and discriminated by mechanisms tuned to these 'cardinal' directions. (C) 2001 Elsevier Science Ltd. All rights reserved.