Grove Philip M, Sakurai Kenzo
School of Psychology, The University of Queensland, St Lucia, Brisbane, QLD 4072, Australia.
Perception. 2009;38(7):951-65. doi: 10.1068/p5860.
When two identical targets move toward one another from opposite sides of a display and continue past one another along collinear trajectories, they can be perceived to either stream past or bounce off of one another. Streaming is the dominant perception in motion displays free of additional transients, while bouncing predominates when a transient (eg auditory or visual) is presented at the point of coincidence. We investigated whether the auditory induced bias towards bouncing would persist as the probability of a motion reversal was reduced by introducing a spatial offset either vertically in a 2-D display or in depth in a 3-D display. Offset conditions were combined with two auditory conditions (tone or no-tone at the point of coincidence) in the presence or absence of a central occluder. In conditions with no sound, streaming was reported on a clear majority of trials, regardless of spatial offset. When a transient tone was presented, reported motion reversals dominated and persisted for increasing verbal offsets up to 17.9 min of arc and for 3-D trajectory offsets up to 25.6 min of arc. The bounce-promoting effect of an auditory tone at the point of coincidence in stream/bounce displays persists in spite of rendering the visual motion sequence unambiguous and more consistent with streaming.
当两个相同的目标从显示屏的相对两侧朝着彼此移动，并沿着共线轨迹相互穿过时，它们可能会被感知为彼此流过或相互反弹。在没有额外瞬变的运动显示中，流过是主要的感知，而当在重合点呈现瞬变（如听觉或视觉瞬变）时，反弹则占主导。我们研究了通过在二维显示屏中垂直引入空间偏移或在三维显示屏中沿深度引入空间偏移来降低运动反转概率时，听觉诱发的对反弹的偏向是否会持续存在。在有或没有中央遮挡物的情况下，将偏移条件与两种听觉条件（重合点处有音调或无音调）相结合。在没有声音的条件下，无论空间偏移如何，在绝大多数试验中都报告为流过。当呈现瞬变音调时，报告的运动反转占主导，并且对于高达17.9分视角的垂直偏移和高达25.6分视角的三维轨迹偏移，随着偏移增加而持续存在。尽管使视觉运动序列变得明确且更符合流过的情况，但在流/反弹显示中，重合点处的听觉音调促进反弹的效果仍然存在。
