Serial dependence is absent at the time of perception but increases in visual working memory.
Serial dependence is absent at the time of perception but increases in visual working memory.
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DOI：
10.1038/s41598-017-15199-7
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发表时间：
2017-11-07
影响因子：
4.6
通讯作者：
D'Esposito M
中科院分区：
文献类型：
--
作者：
Bliss DP;Sun JJ;D'Esposito M
最近的实验表明，视觉认知将当前的输入与最近的输入相结合，以指导正在进行的决策。这种序列依赖性似乎利用了视觉场景中通常存在的时间自相关来促进感知稳定性。虽然这种好处已经被假设，但序列依赖性直接改变刺激感知的证据仍然有限。在本研究中，我们在空间延迟反应任务中参数化地改变刺激和反应之间的延迟，以探索从感知时刻到感知后视觉工作记忆的序列依赖性轨迹。我们发现，观看刺激后立即做出的行为反应显示出适应的证据，但不具有吸引力的序列依赖性。只有当记忆周期延长时，过去和现在信息的混合才会在行为中显现出来，并在延迟六秒后达到最大值。这些结果与其他最近的发现相吻合，支持了这样的解释：序列依赖是一种助记现象，而不是感知过程。然而，尽管现在已经一致地发现了群体平均数据中的这种效应模式，但我们表明，适应和序列依赖性的相对强度在个体之间存在很大差异。最后，我们证明，当调整工作记忆的主要数学模型以考虑这些试验历史效应时，它们与行为数据的拟合度会大大提高。
Recent experiments have shown that visual cognition blends current input with that from the recent past to guide ongoing decision making. This serial dependence appears to exploit the temporal autocorrelation normally present in visual scenes to promote perceptual stability. While this benefit has been assumed, evidence that serial dependence directly alters stimulus perception has been limited. In the present study, we parametrically vary the delay between stimulus and response in a spatial delayed response task to explore the trajectory of serial dependence from the moment of perception into post-perceptual visual working memory. We find that behavioral responses made immediately after viewing a stimulus show evidence of adaptation, but not attractive serial dependence. Only as the memory period lengthens is a blending of past and present information apparent in behavior, reaching its maximum with a delay of six seconds. These results dovetail with other recent findings to bolster the interpretation that serial dependence is a phenomenon of mnemonic rather than perceptual processes. However, even while this pattern of effects in group-averaged data has now been found consistently, we show that the relative strengths of adaptation and serial dependence vary widely across individuals. Finally, we demonstrate that when leading mathematical models of working memory are adjusted to account for these trial-history effects, their fit to behavioral data is substantially improved.
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