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Abstract：
How does the human visual system assess the separation between pairs of stimuli in a frontal plane? According to the direct (or subtractive) view the system finds the difference between the positions of the stimuli in a localization system. According to the indirect (or additive) view the system finds the number of instances of a distance unit lying between representations of the stimuli. Critically, position is explicitly represented under the direct view, with separation being derived from position. Position is not explicitly represented under the indirect view; separation is consequently inferred by counting an internal unit of distance. Recent results favor the indirect over the direct view of separation assessment. Dissociations between assessments of separation and position, various context effects in the assessment of separation, and suggestions that position information is not cleanly accessed argue against the direct view. At the same time, various context effects in separation assessment argue for the indirect view. Recent findings regarding the brain bases of vision are consistent with the indirect view. In short, recent results suggest that assessing the separation between two frontal stimuli involves integrating distance units between representations of the stimuli.
摘要：
人类视觉系统如何评估额叶平面中刺激对之间的间隔？根据直接（或减法）视图，系统可以找到定位系统中刺激位置之间的差异。根据间接(或相加)视图,系统找到位于刺激的表示之间的距离单位的实例的数量。严重的,位置在直接视图下明确表示，分离来自位置。在间接视图下没有明确表示位置；因此，通过计算内部距离单位来推断分离。最近的结果倾向于间接评估，而不是直接评估。分离和地位评估之间的分离，分离评估中的各种环境影响，关于位置信息没有被干净地访问的建议反对直接视图。同时,分离评估中的各种语境效应主张间接观点。关于视觉大脑基础的最新发现与间接观点一致。总之,最近的结果表明，评估两个额叶刺激之间的分离涉及整合刺激表示之间的距离单位。
