Department of Psychology, Brock University, St. Catharines, ON, Canada L2S 3A1.
Brain Res. 2011 Apr 28;1387:99-107. doi: 10.1016/j.brainres.2011.02.069. Epub 2011 Mar 17.
Accuracy for a second target (T2) is reduced when it is presented within 500 ms of a first target (T1) in a rapid serial visual presentation (RSVP)-an attentional blink (AB). Reducing the amount of attentional investment with an additional task or instructing the use of a more relaxed cognitive approach has been found to reduce the magnitude of the AB. As well, personality and affective traits, as well as affective states, associated with a more diffused or flexible cognitive approach have been found to predict smaller AB magnitudes. In the current study, event-related desynchronization in the alpha range was used to investigate whether the degree of attentional investment in anticipation of a RSVP trial was related to the behavioral outcome of that trial. As hypothesized, greater alpha ERD before the RSVP trial, indicating greater anticipatory attentional investment, was observed on short lag trials where an AB was present (inaccurate T2 performance) compared to short lag trials where an AB did not occur. However, on trials where T2 was presented after a longer period relative to T1, greater alpha ERD before the RSVP trial was found on trials with accurate T2 performance. Results support models of the AB that propose that greater attentional investment underlies the AB, and furthermore that this attentional investment is prepared in anticipation before each RSVP trial.
当在快速序列视觉呈现 (RSVP) 中在第一个目标 (T1) 之后 500 毫秒内呈现第二个目标 (T2) 时，T2 的准确性会降低-这是一种注意力眨眼 (AB)。发现通过附加任务减少注意力投入的量或指示使用更轻松的认知方法可以减少 AB 的幅度。此外，与更分散或灵活的认知方法相关的人格和情感特征以及情感状态也被发现可以预测较小的 AB 幅度。在当前的研究中，使用 alpha 范围内的事件相关去同步化来研究在 RSVP 试验之前对注意力的投入程度是否与该试验的行为结果有关。如假设，在 AB 存在（不准确的 T2 表现）的短滞后试验中，与 AB 未发生的短滞后试验相比，RSVP 试验之前的 alpha 去同步化程度更大，这表明注意力投入度更高。然而，在 T2 相对于 T1 呈现的时间较长的情况下，在 RSVP 试验之前，alpha 去同步化程度更大的情况下，T2 的表现准确。结果支持 AB 的模型，该模型提出，更大的注意力投入是 AB 的基础，此外，这种注意力投入是在每个 RSVP 试验之前预期进行准备的。
