Dickinson Christopher A, Intraub Helene
Department of Psychology, University of Delaware, Newark, DE 19716-2577, USA.
J Exp Psychol Hum Percept Perform. 2008 Jun;34(3):543-55. doi: 10.1037/0096-1523.34.3.543.
How rapidly does boundary extension occur? Across experiments, trials included a 3-scene sequence (325 ms/picture), masked interval, and repetition of 1 scene. The repetition was the same view or differed (more close-up or wide angle). Observers rated the repetition as same as, closer than, or more wide angle than the original view on a 5-point scale. Masked intervals were 100, 250, 625, or 1,000 ms in Experiment 1 and 42, 100, or 250 ms in Experiments 2 and 3. Boundary extension occurred in all cases: Identical views were rated as too "close-up," and distractor views elicited the rating asymmetry typical of boundary extension (wider angle distractors were rated as being more similar to the original than were closer up distractors). Most important, boundary extension was evident when only a 42-ms mask separated the original and test views. Experiments 1 and 3 included conditions eliciting a gaze shift prior to the rating test; this did not eliminate boundary extension. Results show that boundary extension is available soon enough and is robust enough to play an on-line role in view integration, perhaps supporting incorporation of views within a larger spatial framework.
边界扩展的发生速度有多快？在各项实验中，试验包括一个三场景序列（每张图片325毫秒）、掩蔽间隔以及一个场景的重复。重复部分是相同视角或不同视角（更特写或更广角）。观察者在五点量表上对重复部分进行评分，判断其与原始视角相同、比原始视角更近还是比原始视角更广角。在实验1中，掩蔽间隔为100、250、625或1000毫秒，在实验2和3中为42、100或250毫秒。在所有情况下都出现了边界扩展：相同视角被评为过于“特写”，干扰视角引发了边界扩展典型的评分不对称（广角干扰视角比特写干扰视角被评为与原始视角更相似）。最重要的是，当原始视图和测试视图之间仅间隔42毫秒的掩蔽时，边界扩展就很明显。实验1和3包括在评分测试之前引发注视转移的条件；这并没有消除边界扩展。结果表明，边界扩展出现得足够快且足够稳健，能够在视图整合中发挥在线作用，也许有助于将视图纳入更大的空间框架中。
