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首页> 外文期刊>Neuropsychologia >Real color captures attention and overrides spatial cues in grapheme-color synesthetes but not in controls
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Real color captures attention and overrides spatial cues in grapheme-color synesthetes but not in controls

机译：实色可以吸引注意力并覆盖字素-颜色合成体中的空间提示，但不能控制控件中的空间提示

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摘要

Grapheme-color synesthetes perceive color when reading letters or digits. We investigated oscillatory brain signals of synesthetes vs. controls using magnetoencephalography. Brain oscillations specifically in the alpha band (~10. Hz) have two interesting features: alpha has been linked to inhibitory processes and can act as a marker for attention. The possible role of reduced inhibition as an underlying cause of synesthesia, as well as the precise role of attention in synesthesia is widely discussed.To assess alpha power effects due to synesthesia, synesthetes as well as matched controls viewed synesthesia-inducing graphemes, colored control graphemes, and non-colored control graphemes while brain activity was recorded. Subjects had to report a color change at the end of each trial which allowed us to assess the strength of synesthesia in each synesthete.Since color (synesthetic or real) might allocate attention we also included an attentional cue in our paradigm which could direct covert attention. In controls the attentional cue always caused a lateralization of alpha power with a contralateral decrease and ipsilateral alpha increase over occipital sensors. In synesthetes, however, the influence of the cue was overruled by color: independent of the attentional cue, alpha power decreased contralateral to the color (synesthetic or real). This indicates that in synesthetes color guides attention. This was confirmed by reaction time effects due to color, i.e. faster RTs for the color side independent of the cue. Finally, the stronger the observed color dependent alpha lateralization, the stronger was the manifestation of synesthesia as measured by congruency effects of synesthetic colors on RTs.Behavioral and imaging results indicate that color induces a location-specific, automatic shift of attention towards color in synesthetes but not in controls. We hypothesize that this mechanism can facilitate coupling of grapheme and color during the development of synesthesia.
机译：字素色合成物在读取字母或数字时会感知颜色。我们使用脑磁图研究了联觉与对照的振荡性脑信号。特别是在Alpha波段（〜10。Hz）的大脑振荡具有两个有趣的特征：Alpha与抑制过程有关，可以作为注意力的标志。广泛讨论了降低抑制作用作为联觉的潜在原因的可能作用，以及注意力在联觉中的确切作用。为了评估联觉引起的α功率效应，将联觉者和匹配的对照视为诱导联觉的字素，有色对照记录了大脑活动时的石墨烯和非彩色对照石墨烯。在每次试验结束时，受试者必须报告颜色变化，这使我们能够评估每种合成物中的联觉强度。由于颜色（合成的或真实的）可能会分配注意力，因此我们在范例中也包含了注意提示，可以直接引起秘密关注。在控制中，注意力提示总是导致相对于枕骨传感器的α功率侧向化，对侧降低，同侧α升高。然而，在合成物中，颜色影响了提示的影响：独立于注意提示，与颜色（同感或真实）对侧的alpha功率降低。这表明在合成物中，颜色引导注意力。这是由于颜色引起的反应时间影响所证实的，即颜色侧的快速RTs与提示无关。最后，观察到的颜色依赖性阿尔法侧向作用越强，通过感觉颜色对RTs的一致性影响所测量的感觉表现就越强。行为和成像结果表明，颜色诱导了特定位置的注意力自动转移到感觉上的颜色但不在控件中。我们假设这种机制可以在联觉的发展过程中促进字素和颜色的耦合。

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