Schofield Andrew J, Ledgeway Timothy, Hutchinson Claire V
School of Psychology, University of Birmingham, Birmingham, UK.
J Vis. 2007 Jun 6;7(8):1. doi: 10.1167/7.8.1.
Recent work on motion processing has suggested a distinction between first-order cues (such as luminance modulation [LM]) and second-order cues (such as local contrast modulation [CM]). We studied interactions between moving LM, CM, and orientation modulation (OM) first comparing their spatial- and temporal-frequency sensitivity. We then tested for the transfer of the dynamic motion aftereffect (dMAE) between the three cues, matched for visibility. Observers adapted to moving, 0.5-c/deg horizontal modulations for 2 min (with 10 s top-ups). Relatively strong dMAEs were found when the adaptation and test patterns were defined by the same cue (i.e., both LM, both CM, or both OM); these effects were tuned for spatial frequency in the case of LM and CM. There was a partial transfer of the dMAE from LM to CM and OM; this transferred effect seemed to lose its tuning. The aftereffect transferred well from CM to OM and retained its tuning. There was little or no transfer from CM to LM or from OM to CM or LM. This asymmetric transfer of the dMAE between first- and second-order cues and between the second-order cues suggests some degree of separation between the mechanisms that process them.
近期关于运动处理的研究表明，一阶线索（如亮度调制[LM]）和二阶线索（如局部对比度调制[CM]）之间存在区别。我们研究了移动的LM、CM和方向调制（OM）之间的相互作用，首先比较了它们的空间和时间频率敏感性。然后，我们测试了三种线索之间动态运动后效（dMAE）的转移情况，这些线索在可见性方面进行了匹配。观察者适应了以0.5周/度的水平调制进行移动2分钟（中间有10秒的补充）。当适应和测试模式由相同线索定义时（即两者都是LM、两者都是CM或两者都是OM），发现了相对较强的dMAE；在LM和CM的情况下，这些效应在空间频率上进行了调整。dMAE从LM部分转移到CM和OM；这种转移的效应似乎失去了其调谐特性。后效从CM很好地转移到OM并保留了其调谐特性。从CM到LM或从OM到CM或LM几乎没有或没有转移。dMAE在一阶和二阶线索之间以及二阶线索之间的这种不对称转移表明，处理它们的机制之间存在一定程度的分离。
