Kieffaber Paul D, Hetrick William P
Department of Psychology, Indiana University, Bloomington, Indiana 47405, USA.
Psychophysiology. 2005 Jan;42(1):56-71. doi: 10.1111/j.1469-8986.2005.00262.x.
Studies of task switching demonstrate that task switches are associated with response costs and that these costs are reduced when a cue is presented in advance of a switch. The present study examined cortical event-related potential correlates of task switching and switch costs in 39 participants during a cued match/mismatch discrimination task. Compared with non-switch trials, switch trials were associated with a larger cue-related, anticipatory P3b-like waveform. Switch trials were also associated with smaller target-related, stimulus-dependent P2 and P3-like components. Moreover, the switch-related amplitude variability in the P3b to the cue and the P2 to the target were associated with unique components of the residual switch costs. The results support an integrated model of task switching with complementary yet distinct roles for anticipatory and stimulus-dependent processes in task switching and switch costs.
任务切换的研究表明，任务切换与反应成本相关，并且当在切换之前呈现提示时，这些成本会降低。本研究在39名参与者进行提示性匹配/不匹配辨别任务期间，检查了任务切换和切换成本的皮层事件相关电位相关性。与非切换试验相比，切换试验与更大的提示相关的预期P3b样波形相关。切换试验还与较小的目标相关的、刺激依赖的P2和P3样成分相关。此外，P3b对提示的切换相关幅度变异性和P2对目标的切换相关幅度变异性与残余切换成本的独特成分相关。结果支持了一个任务切换的综合模型，该模型中预期过程和刺激依赖过程在任务切换和切换成本中具有互补但不同的作用。
