Takahashi Junichi, Yasunaga Daichi
Department of Psychology, Graduate School of Arts and Letters, Tohoku University, Sendai, Miyagi, Japan.
Neuroreport. 2012 Oct 24;23(15):904-10. doi: 10.1097/WNR.0b013e3283595741.
A previous behavioral study showed that a group of individuals with high vividness of visual imagery (High group), as determined from the score for the Vividness of Visual Imagery Questionnaire (VVIQ), could perceive the apparent motion path more strongly than a group of individuals with low vividness of visual imagery (Low group). To examine the physiological differences underlying these differences in perception, we compared the brain activity during an apparent motion task for the High and the Low groups using electroencephalography. We initially screened 60 potential participants using the VVIQ. On the basis of their scores, we invited 20 people from the lower and the higher ends of the VVIQ distribution to participate in our event-related potential study. Our results showed that individuals in both the High and the Low groups were sensitive to the apparent motion content of the task. Perception of apparent motion evoked a negative potential starting around 90 ms, followed by a positive potential beginning at 150-170 ms after the second stimulus. The scalp distributions of both negative and positive potentials for the High group were broader than those for the Low group. Moreover, the onset of positivity in the High group (150 ms) was earlier than that in the Low group (170 ms). We believe that these results may be mechanistically associated with the differences in the perception of apparent motion between individuals with high and low vividness of visual imagery.
先前的一项行为学研究表明，根据视觉意象生动性问卷（VVIQ）的得分确定，一组视觉意象生动性高的个体（高分组）比一组视觉意象生动性低的个体（低分组）能更强烈地感知到明显的运动路径。为了研究这些感知差异背后的生理差异，我们使用脑电图比较了高分组和低分组在明显运动任务期间的大脑活动。我们最初使用VVIQ对60名潜在参与者进行了筛选。根据他们的得分，我们邀请了VVIQ分布两端的20人参与我们的事件相关电位研究。我们的结果表明，高分组和低分组的个体对任务的明显运动内容都很敏感。对明显运动的感知会诱发一个大约在90毫秒开始的负电位，随后在第二个刺激后150 - 170毫秒开始出现一个正电位。高分组负电位和正电位的头皮分布都比低分组更广泛。此外，高分组正电位的起始时间（150毫秒）比低分组（170毫秒）更早。我们认为，这些结果可能在机制上与视觉意象生动性高和低的个体在明显运动感知上的差异有关。
