THE DETECTION AND DISCRIMINATION OF SPATIAL OFFSETS
THE DETECTION AND DISCRIMINATION OF SPATIAL OFFSETS
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DOI：
10.1016/0042-6989(94)e0082-v
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发表时间：
1995-01-01
期刊：
影响因子：
1.8
通讯作者：
FAHLE, M
中科院分区：
文献类型：
--
作者：
HARRIS, JP;FAHLE, M
空间偏移量的检测意味着指示给定(游标)刺激是否具有空间偏移量的能力。另一方面，歧视意味着已经正确地确定了抵消的方向。我们比较了这两个任务的游标阈值，发现一致的差异约为支持歧视的2倍。这就是说，观察者能够正确地指示偏移的方向，这些偏移量太小而不能被相同的观察者可靠地检测到。这种明显的悖论可以在两个任务中都涉及一个单一的双极机制的假设下得到解释，并且观察者使用方向选择性线索，例如通过游标刺激的隐含线的方向差异。文中还讨论了对超敏度敏感度估计的意义。
By detection of spatial offsets is meant the ability to indicate whether or not a given (vernier) stimulus has a spatial offset. Discrimination, on the other hand, implies that the direction of offset has been correctly identified. We compared vernier thresholds for these two tasks and found a consistent difference by a factor of around 2 in favour of discrimination. This is to say that observers are able to correctly indicate the direction of offsets that are too small to be reliably detected by the same observers. This apparent paradox can be explained on the assumptions that one single, bipolar mechanism is involved in both tasks, and that observers use a direction selective cue such as the orientation difference of the implicit lines through the vernier stimuli. The implications for estimates of the sensitivity of hyperacuity are discussed.