Task and spatial frequency modulations of object processing: an EEG study.

Task and spatial frequency modulations of object processing: an EEG study.
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DOI:
10.1371/journal.pone.0070293
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Müller MM
Müller MM
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Craddock M;Martinovic J;Müller MM

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视觉对象处理可能遵循低空间频率(LSF)的快速处理和高空间频率(HSF)的缓慢处理所施加的从粗到精的顺序。对象可以按不同的具体程度进行分类:上级(如动物)、基本(如狗)或下级(如边境牧羊犬)。我们测试了上级和更具体的分类是否依赖于不同的空间频率范围,以及这种依赖关系是否可能被脑电图记录的信号所揭示或影响。我们使用事件相关电位(ERPs)和时间频率(TF)分析来检查对象处理的时间过程,同时参与者执行语法性别分类任务(通常强制基本分类)或对日常生活中的对象进行活体/非活体判断(高级分类)。对象被过滤为只包含HSF或LSF。我们发现,在P1和N1中,HSF的正性和负性分别大于LSF的正性和负性,但任务对这两个成分都没有影响。在性别分类任务中,额-中枢负性(N350)比上级分类任务负性更强,这可能表明该成分与语义或句法加工有关。我们发现任务频率或空间频率对诱发的或总伽马波段反应没有显著影响。我们的研究结果表明,分类任务不调节HSF和LSF内容的早期加工差异,后期反应反映了这些更高层次的认知因素。
Visual object processing may follow a coarse-to-fine sequence imposed by fast processing of low spatial frequencies (LSF) and slow processing of high spatial frequencies (HSF). Objects can be categorized at varying levels of specificity: the superordinate (e.g. animal), the basic (e.g. dog), or the subordinate (e.g. Border Collie). We tested whether superordinate and more specific categorization depend on different spatial frequency ranges, and whether any such dependencies might be revealed by or influence signals recorded using EEG. We used event-related potentials (ERPs) and time-frequency (TF) analysis to examine the time course of object processing while participants performed either a grammatical gender-classification task (which generally forces basic-level categorization) or a living/non-living judgement (superordinate categorization) on everyday, real-life objects. Objects were filtered to contain only HSF or LSF. We found a greater positivity and greater negativity for HSF than for LSF pictures in the P1 and N1 respectively, but no effects of task on either component. A later, fronto-central negativity (N350) was more negative in the gender-classification task than the superordinate categorization task, which may indicate that this component relates to semantic or syntactic processing. We found no significant effects of task or spatial frequency on evoked or total gamma band responses. Our results demonstrate early differences in processing of HSF and LSF content that were not modulated by categorization task, with later responses reflecting such higher-level cognitive factors.
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