Maslovat Dana, Chua Romeo, Spencer Hunter C, Forgaard Christopher J, Carlsen Anthony N, Franks Ian M
School of Kinesiology, University of British Columbia, Canada.
Acta Psychol (Amst). 2013 Nov;144(3):481-7. doi: 10.1016/j.actpsy.2013.08.005. Epub 2013 Sep 25.
The present study was designed to investigate the mechanism associated with dual-task interference in a psychological refractory period (PRP) paradigm. We used a simple reaction time paradigm consisting of a vocal response (R1) and key-lift task (R2) with a stimulus onset asynchrony (SOA) between 100ms and 1500ms. On selected trials we implemented a startling acoustic stimulus concurrent with the second stimulus to determine if we could involuntarily trigger the second response. Our results indicated that the PRP delay in the second response was present for both control and startle trials at short SOAs, suggesting the second response was not prepared in advance. These results support a response preparation bottleneck and can be explained via a neural activation model of preparation. In addition, we found that the reflexive startle activation was reduced in the dual-task condition for all SOAs, a result we attribute to prepulse inhibition associated with dual-task processing.
本研究旨在探讨心理不应期（PRP）范式中与双任务干扰相关的机制。我们使用了一个简单的反应时范式，包括一个发声反应（R1）和按键任务（R2），刺激起始异步（SOA）在100毫秒至1500毫秒之间。在选定的试验中，我们在第二个刺激同时实施一个惊人的听觉刺激，以确定我们是否能非自愿地触发第二个反应。我们的结果表明，在短SOA时，对照试验和惊吓试验的第二个反应中都存在PRP延迟，这表明第二个反应没有提前准备。这些结果支持了一个反应准备瓶颈，并可以通过准备的神经激活模型来解释。此外，我们发现，在所有SOA的双任务条件下，反射性惊吓激活都减少了，我们将这一结果归因于与双任务处理相关的前脉冲抑制。
