The objectification of overlearned sequences: A new view of spatial sequence synesthesia
The objectification of overlearned sequences: A new view of spatial sequence synesthesia
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DOI：
10.1016/j.cortex.2009.06.012
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发表时间：
2009-11-01
期刊：
影响因子：
3.6
通讯作者：
Eagleman, David M.
中科院分区：
文献类型：
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作者：
Eagleman, David M.
在空间序列联觉（SSS）现象中，受试者可以清晰地表达诸如数字、字母、星期、月、年和其他过度学习的序列的明确空间位置。同样，抽象序列可以在非联觉者中呈现内隐空间表征，如反应代码的空间数字关联（SNARC）效应所证明的。一个悬而未决的问题是，这两个发现是否代表了相同条件的不同程度，或不同的条件。为了解决这个问题，我们开发了计算机程序来量化571名自我报告的空间序列联觉者的三维（3D）月形坐标;这种方法首次打开了量化大规模分析的大门。首先，尽管人们普遍假设月形是椭圆形的，但我们发现这只在少数情况下是正确的。其次，我们发现27%的月份形式是线条形状，与SNARC效应中隐含空间形式的假设形状一致。接下来，我们发现大多数月份形式都偏向于从左到右的方向，这也与SNARC效应中的方向偏向一致（在西方人中）。总的来说，这些发现支持SSS与非联觉者的序列表征直接相关的可能性。虽然神经相关的搜索集中在数字操作和坐标系统中涉及的顶叶区域，我们提出，这种联觉的基础可能是涉及序列编码和视觉对象表征的颞叶区域的紧密接近。(C)2009 Elsevier Srl. All rights reserved.
in the phenomenon of spatial sequence synesthesia (SSS), subjects can articulate explicit spatial locations for sequences such as numbers, letters, weekdays, months, years, and other overlearned series. Similarly, abstract sequences can take on implicit spatial representations in non-synesthetes, as evidenced by the spatial numerical association of response codes (SNARC) effect. An open question is whether the two findings represent different degrees of the same condition, or different conditions. To address this, we developed computer programs to quantify three-dimensional (3D) month-form coordinates in 571 self-reported spatial sequence synesthetes; this approach opens the door for the first time to quantified large-scale analysis. First, despite the common assumption that month-forms tend to be elliptical, we find this to be true in only a minority of cases. Second, we find that 27% of month forms are in the shape of lines, consistent with the assumed shape of implicit spatial forms in the SNARC effect. Next, we find that the majority of month forms are biased in a left-to-right direction, also consistent with the directional bias in the SNARC effect (in western speakers). Collectively, these findings support the possibility that SSS is directly related to the sequence representations in non-synesthetes. While the search for neural correlates has concentrated on areas in the parietal lobe involved in numeric manipulation and coordinate systems, we propose that the basis of this synesthesia may be the close proximity of temporal lobe regions implicated in sequence coding and visual object representation. (C) 2009 Elsevier Srl. All rights reserved.