O'Grady R B, Müller H J
Department of Psychology, Birkbeck College, University of London, Malet Street, London WC1E 7HX, England.
Percept Psychophys. 2000 Nov;62(8):1655-67. doi: 10.3758/bf03212163.
In two experiments, space- and object-based selection effects were investigated, using variants of the ring-cuing paradigm of Egly and Homa (1984). The results revealed significant cuing modulation for nonring configurations of target locations spanning a range of retinal eccentricities, with the cuing effects independent of eccentricity and confined to the configuration of locations (rather than extending to locations within the space enclosed by the cued configuration). These results are consistent with object-based selection operating on a grouped spatial array (Vecera & Farah, 1994). Object selection may be based on a supradimensional saliency map representation of the field, modulated by feature-specific segmentation mechanisms (e.g., an object may be made salient on the basis of its color). Complex objects may be represented by grouped saliency signals. In this way, a two-dimensional spatial (saliency) representation may provide the common format for object-based selection, prior to full object definition.
在两项实验中，采用了埃格利和霍马（1984年）的环形提示范式的变体，研究了基于空间和物体的选择效应。结果显示，对于跨越一系列视网膜偏心度的目标位置的非环形配置，存在显著的提示调制，提示效应与偏心度无关，且局限于位置配置（而非扩展到提示配置所包围空间内的位置）。这些结果与基于物体的选择在分组空间阵列上进行操作一致（韦塞拉和法拉，1994年）。物体选择可能基于该场的超维度显著性地图表示，并由特征特定的分割机制调制（例如，一个物体可能因其颜色而变得显著）。复杂物体可能由分组的显著性信号表示。通过这种方式，二维空间（显著性）表示可能在完整物体定义之前为基于物体的选择提供通用格式。
