...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>BMC Neuroscience >Combined expectancies: electrophysiological evidence for the adjustment of expectancy effects
【24h】

Combined expectancies: electrophysiological evidence for the adjustment of expectancy effects

机译：综合预期：调整预期效果的电生理证据

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Background When subjects use cues to prepare for a likely stimulus or a likely response, reaction times are facilitated by valid cues but prolonged by invalid cues. In studies on combined expectancy effects, two cues can independently give information regarding two dimensions of the forthcoming task. In certain situations, cueing effects on one dimension are reduced when the cue on the other dimension is invalid. According to the Adjusted Expectancy Model, cues affect different processing levels and a mechanism is presumed which is sensitive to the validity of early level cues and leads to online adjustment of expectancy effects at later levels. To examine the predictions of this model cueing of stimulus modality was combined with response cueing. Results Behavioral measures showed the interaction of cueing effects. Electrophysiological measures of the lateralized readiness potential (LRP) and the N200 amplitude confirmed the predictions of the model. The LRP showed larger effects of response cues on response activation when modality cues were valid rather than invalid. N200 amplitude was largest with valid modality cues and invalid response cues, medium with invalid modality cues, and smallest with two valid cues. Conclusion Findings support the view that the validity of early level expectancies modulates the effects of late level expectancies, which included response activation and response conflict in the present study.
机译：背景技术当受试者使用线索为可能的刺激或可能的反应做准备时，有效线索会加快反应时间，但无效线索会延长反应时间。在有关组合预期效果的研究中，两个提示可以独立给出有关即将完成的任务的两个方面的信息。在某些情况下，当另一维度上的提示无效时，可以降低一个维度上的提示效果。根据调整后的期望模型，提示会影响不同的处理级别，并且假定一种机制对早期提示的有效性敏感，并导致在线调整后期提示的效果。为了检验该模型的预测，将刺激模态的提示与响应提示相结合。结果行为指标显示了提示效果的相互作用。横向准备就绪电位（LRP）和N200振幅的电生理学测量结果证实了该模型的预测。当情态提示有效而不是无效时，LRP对响应激活显示更大的影响。 N200振幅最大，具有有效的模态线索和无效的响应线索，中等的具有无效的模态线索，最小的具有两个有效的线索。结论结论支持以下观点：早期预期的有效性调节晚期预期的影响，在本研究中包括反应激活和反应冲突。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号