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Time course of egocentric decay, allocentric decay, and allocentric-to-egocentric conversion in memory-guided reach.

机译:在记忆引导的范围内,自我中心衰减,同心中心衰减和同心向自我中心转换的时间过程。

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摘要

Allocentric cues can be used to encode target locations in visuospatial memory, but it is not known how these representations are converted into egocentric commands for behaviour. We tested the influence of different memory intervals on reach performance toward targets defined in either egocentric or allocentric coordinates, and then compared this to performance in a task where subjects were implicitly free to choose when to convert from allocentric to egocentric representations (the allo-to-ego conversion condition). Nine subjects reached to place their right index finger at a remembered target location in complete darkness after a variable memory delay (2.5sec, 5.5sec, or 8.5sec in total). Our results confirm that egocentric representations degrade over a delay of several seconds, wheras allocentric representations remained relatively stable over the same time scale. Despite a cost in precision, when subjects were free to choose, they converted allocentric into egocentric representations as soon as possible. This suggests that the brain prefers to use egocentric coordinates for visuomotor transformations. Furthermore, this early conversion appears to provide a benefit in reaction time that is perhaps more important in real-world circumstances.
机译:可将同心轴提示用于在视觉空间内存中对目标位置进行编码,但尚不知道如何将这些表示形式转换为以自我为中心的行为指令。我们测试了不同记忆间隔对达到以自我中心或同心坐标定义的目标的到达效果的影响,然后将其与任务中的性能进行比较,在该任务中,受试者可以自由选择何时从同心表示转换为自我中心表示(同位-自我转换条件)。经过可变的记忆延迟(总共2.5秒,5.5秒或8.5秒)后,九名受试者伸手将其右手食指放在完全黑暗的记忆目标位置。我们的研究结果证实,以自我为中心的表征会在几秒钟的延迟时间内退化,而以异体为中心的表征在相同的时间范围内仍保持相对稳定。尽管要付出一定的代价,但当受试者自由选择时,他们会尽快将同心异体转换成以自我为中心。这表明大脑更喜欢使用以自我为中心的坐标进行视觉运动转换。此外,这种早期转换似乎在响应时间上提供了好处,这在现实环境中可能更为重要。

著录项

  • 作者

    Chen, Ying.;

  • 作者单位

    York University (Canada).;

  • 授予单位 York University (Canada).;
  • 学科 Psychology Psychobiology.;Psychology Cognitive.;Psychology Behavioral.
  • 学位 M.Sc.
  • 年度 2010
  • 页码 119 p.
  • 总页数 119
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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