工作记忆广度：资源限制、记忆消退还是转换机制？

Working Memory Span: Resource Constrain, Memory Decay or Switching Mechanism?

为了检验工作意义广度有限性的3种假说，即资源限制假说、记忆消退假说和转换机制假说，实验要求被试首先完成一项转换效率任务，然后完成工作记忆广度任务。结果发现，加工负荷对工作记忆广度具有重要影响，保持时间不影响工作记忆广度，转换效率与工作记忆广度也没有显著相关。实验结果支持工作记忆广度受认知资源限制的观点。

IntroductionThere are mainly three models concerning cognitive mechanisms underlying the limitations of working memory span， namely， resource-sharing model， task-switching model and time-based resource-sharing model. The resource-sharing model indicagtes that working memory span is constrained by limited cognitive resources. The task-switching model claims that memory decay is the main factor affecting working memory span. Finally， the time-based resource-sharing model suggests that working memo