Predicting the shape of distance functions in curve tracing: Evidence for a zoom lens operator
Predicting the shape of distance functions in curve tracing: Evidence for a zoom lens operator
复制标题
预测曲线追踪中距离函数的形状：变焦镜头操作员的证据
作者：
P. McCormick;P. Jolicoeur
Jolicoeur，Uliman，and MacKay（1986）表明，当两个点之间的曲线距离增加时，确认两个点在同一条曲线上的时间单调增加，但非线性增加。这些显示器包含两条曲线和两个点。在相同的试验中，两个点在同一条曲线上（目标曲线），而另一条曲线作为箔（牵引曲线）。曲线距离对反应时间的单调增加效应--对于相同的试验，表明干预曲线段被追踪。在目前的调查的来源，这些距离函数中的非线性，有人假设，-在干扰曲线的差异可能允许曲线跟踪操作员与变焦透镜属性，以扩大其感受野，同时跟踪某些目标曲线的一部分。由于操作员扫描曲线所需的移位次数减少，更宽的感受野可能允许在某些段上更快地跟踪。比曲线的其他段更快地训练曲线的某些段的结果将是距离的非线性效应。一组新的刺激被创建用于直接测试该假设。相当线性的距离效应被发现的刺激，包含一个分心物曲线，限制了宽度的假设曲线跟踪运营商，而刺激，包含一个分心物曲线，可以允许一个更大的感受野产生非线性距离函数。结果进行了比较与预测的三个定量模型：逐像素跟踪; Jolicoeur，Ullman，和麦凯（1991年）的二分算子;和一个新的变焦透镜模型，类似于变焦透镜模型的视觉注意。后一种模型的结果拟合得最好，在该模型中，跟踪是通过用一个小型局部算子跟踪曲线来完成的。
Jolicoeur, Uliman, and MacKay (1986) showed that the time to confirm that two dots are on the same curve increases monotonically, but nonlinearly, as the curve distance between the two dots increases. These displays contained two curves and two dots. Onsame trials, the two dots were on the same curve (target curve), while the other curve served as a foil (distractor curve). The monotonically increasing effects of curve distance on response times-forsame trials suggested that the intervening curve segment was traced. In the present investigation of the source of the nonlinearity in these distance functions, it was hypothesized that- differences in the distractor curves may have allowed a curve tracing operator with zoom lens properties to widen its receptive field while tracing parts of certain target curves. The wider receptive field may have allowed faster tracing over certain segments, owing to a reduced number of shifts required by the operator to scan the curve. The consequence of training certain segments of the curve more quickly than other segments of the curve would be a nonlinear effect of distance. A new set of stimuli was created for testing this hypothesis directly. Fairly linear distance effects were found for stimuli that contained a distractor curve that constrained the breadth of the postulated curve tracing operator, whereas stimuli that contained a distractor curve that could allow for a larger receptive field yielded nonlinear distance functions. The results are compared with the predictions of three quantitative models: pixel-by-pixel tracing; Jolicoeur,Ullman, and MacKay’s(1991) bipartite operator; and a new zoom lens model, analogous to the zoom lens model of visual attention. The results were fit best by the latter model, in which tracing is accomplished by tracking the curve with a variably sized local operator.