探索知觉负荷效应的核心成分:来自静息状态下分数低频振荡幅度的证据
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- 英文论文题名：Identifying the Core Components of Perceptual load effect:Evidence from fractional Amplitude of Low-Frequency Fluctuations during Resting State
- 论文作者：刘路 ; 陈安涛
- 英文论文作者：Lu Liu ; Antao Chen ; School of Psychology ; Southwest University
- 年：2015
- 作者机构：西南大学心理学部;
- 论文关键词：知觉负荷效应 ; 额上回 ; 颞下回 ; 分数低频振荡幅度
- 英文论文关键词：perceptual load effect ; superior frontal gyrus ; inferior temporal gyrus ; fALFF
- 会议召开时间：2015-10-16
- 会议录名称：第十八届全国心理学学术会议摘要集——心理学与社会发展
- 英文会议录名称：Proceedings of the 18th National Academic Congress of Psychology
- 语种：中文
- 分类号：B842.2
- 学会代码：ZGXG
- 会议名称：第十八届全国心理学学术会议
- 会议地点：中国天津
- 主办单位：中国心理学会
- 学会名称：中国心理学会
- 页数：2
- 文件大小：741k
- 原文格式：D
- 会议级别：全国
摘要
分心刺激的干扰效应会受到知觉负荷水平的调节。先前有关知觉负荷的研究有力地证明来自外围分心刺激的干扰在高知觉负荷下会减小。然而,目前为止没有研究关注知觉负荷效应是否存在个体差异以及与个体差异相关的自发神经活动机制。我们采用知觉负荷任务中经典的反应竞争范式探究知觉负荷对分心刺激干扰效应的调节,负荷水平的高低用任务中所需搜索的字母的数量多少来操纵,分心刺激干扰效应的大小用外围分心刺激与目标刺激构成的一致和不一致条件下的反应时差异来衡量,并用高低知觉负荷下分心刺激干扰效应的差异衡量知觉负荷效应的大小。结果表明分心刺激的干扰效应随着知觉负荷水平的升高而减小,知觉负荷效应存在显著的个体差异。此外,本研究运用静息功能磁共振成像(resting-state f MRI)的方法探究知觉负荷效应的自发神经活动基础。作为衡量大脑静息下自发活动强度的指标之一,分数低频震荡幅度(fALFF)某种程度上可以预测行为表现。因此,本研究进行了fALFF与知觉负荷效应的相关分析。结果表明知觉负荷效应与左侧额上回(SFG),左侧颞下回(ITG)以及左侧中央前回、中央后回(precentral/postcentral gyrus)的fALFF值成显著的相关关系。本研究的结果也启示我们知觉负荷效应是可测量的,并且受来自额顶网络的认知控制,视觉注意过程中加工容量的有限性,相互竞争抑制以及反应过程中反映控制和反应选择的影响。
Interference effect from distractors can be modulated by perceptual load. Previous studies clearly demonstrated interference effect from peripheral distractions can be reduced in low load level. However, no research up to date has paid attention to the individual differences in perceptual load effect and the spontaneous neural basis of perceptual load effect. In present study, we adopted classic response competition paradigm to explore how distractions interference effect is modulated by perceptual load. The load level was manipulated by the number of task-relevant distractors around target, and the difference of reaction times between incongruent and neutral conditions was used to measure the effect of peripheral distractions interference. Furthermore, the perceptual load effect was operationally defined as the reduced interference effects from distractors on high perceptual load condition compared to low perceptual load condition. The behavior result showed that the inference effect was reduced in high load condition, and there existed individual difference in perceptual load effect. We employed resting-state fMRI to explore the neural basis of perceptual load effect during resting-state and made a fALFF-behavior correlation analysis. The result showed that the fALFFs in left superior frontal gyrus(SFG), inferior temporal gyrus(ITG) and precentral/postcentral significantly correlated with perceptual load effect, which suggested that the cognitive control from fronto-parietal network, capacity limit and inhibitory interaction during visual attention, selection and control during response can affect perceptual load effect.
Interference effect from distractors can be modulated by perceptual load. Previous studies clearly demonstrated interference effect from peripheral distractions can be reduced in low load level. However, no research up to date has paid attention to the individual differences in perceptual load effect and the spontaneous neural basis of perceptual load effect. In present study, we adopted classic response competition paradigm to explore how distractions interference effect is modulated by perceptual load. The load level was manipulated by the number of task-relevant distractors around target, and the difference of reaction times between incongruent and neutral conditions was used to measure the effect of peripheral distractions interference. Furthermore, the perceptual load effect was operationally defined as the reduced interference effects from distractors on high perceptual load condition compared to low perceptual load condition. The behavior result showed that the inference effect was reduced in high load condition, and there existed individual difference in perceptual load effect. We employed resting-state fMRI to explore the neural basis of perceptual load effect during resting-state and made a fALFF-behavior correlation analysis. The result showed that the fALFFs in left superior frontal gyrus(SFG), inferior temporal gyrus(ITG) and precentral/postcentral significantly correlated with perceptual load effect, which suggested that the cognitive control from fronto-parietal network, capacity limit and inhibitory interaction during visual attention, selection and control during response can affect perceptual load effect.
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