Reduced motor preparation during dual-task performance: evidence from startle

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• 作者：Dana Maslovat ; Neil M. Drummond ; Michael J. Carter…
• 关键词：Activation ; Attention ; Dual ; task ; Probe reaction time ; Preparation ; Startle
• 刊名：Experimental Brain Research
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：233
• 期：9
• 页码：2673-2683
• 全文大小：771 KB
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• 作者单位：Dana Maslovat (1) (2)
  Neil M. Drummond (3)
  Michael J. Carter (3)
  Anthony N. Carlsen (3)
  
  1. School of Kinesiology, University of British Columbia, War Memorial Gymnasium 210-6081 University Boulevard, Vancouver, BC, V6T 1Z1, Canada
  2. Department of Kinesiology, Langara College, Vancouver, BC, Canada
  3. School of Human Kinetics, University of Ottawa, Ottawa, ON, Canada
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Biomedicine
  Neurosciences
  Neurology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1106

文摘

Previous studies have used a secondary probe reaction time (RT) task to assess attentional demands of a primary task. The current study used a startling acoustic stimulus (SAS) in a probe RT paradigm to test the hypothesis that attentional resources would be directly related to limitations in response preparation. Participants performed an easy or difficult version of a continuous primary task that was either primarily motor in nature (pursuit tracking) or cognitive (counting backward). Concurrently, participants responded to an auditory cue as fast as possible by performing a wrist extension secondary movement. On selected trials, the auditory cue was replaced with a SAS (120?dB), which is thought to involuntarily trigger a prepared response and thus bypass any response initiation bottleneck that may be present when trying to perform two movements. Although startle trials were performed at a shorter latency, both non-startle and startle probe trials resulted in a delayed RT, as compared to single-task trials, consistent with reduced preparation of the secondary task. In addition, analysis of SAS trial RT when a startle indicator was present versus absent provided evidence that the secondary task was at a lowered state of preparation when engaged in the cognitive primary task as compared to a motor primary task, suggesting a facilitative effect on preparatory activation when both the primary and secondary tasks are motoric in nature.