Duke C C, Crewther S G, Lawson M L, Henry L, Kiely P M, West S J, Crewther D P
School of Psychological Science, La Trobe University, Bundoora, Victoria, Australia.
Aust N Z J Ophthalmol. 1998 May;26 Suppl 1:S114-6. doi: 10.1111/j.1442-9071.1998.tb01357.x.
Global and local attention are two forms of selective visual attention which activate different areas of the cortex. The purpose of this experiment was to test subjects' motion coherence thresholds under conditions of global or local attention. It was hypothesized that thresholds in global attention would be lower than in local attention.
Eleven adult subjects participated in this study. Subjects were required to identify direction of motion at variable coherence levels, while simultaneously identifying either the global or local letter. Three velocities were used for coherent motion (3, 6 and 18 degrees/s).
The results showed that letter identification (global or local) did not significantly affect motion coherence thresholds; however, thresholds were significantly higher at 18 degrees/s than in the lower velocities.
These results highlight the attentional limitations of visual information shown by increased motion coherence thresholds when two objects must be identified simultaneously in a brief display.
全局注意和局部注意是选择性视觉注意的两种形式，它们会激活大脑皮层的不同区域。本实验的目的是测试在全局或局部注意条件下受试者的运动连贯性阈值。研究假设是全局注意下的阈值会低于局部注意下的阈值。
11名成年受试者参与了本研究。受试者需要在不同连贯性水平下识别运动方向，同时识别全局或局部字母。连贯运动使用了三种速度（3、6和18度/秒）。
结果表明，字母识别（全局或局部）对运动连贯性阈值没有显著影响；然而，18度/秒时的阈值明显高于较低速度时的阈值。
这些结果突出了在短暂展示中必须同时识别两个物体时，运动连贯性阈值增加所显示的视觉信息的注意局限性。
