对层次特征记忆的吸引解释了朝向偏差
Attraction to hierarchical feature memory explains orientation bias
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中文总结 AI 辅助
本研究提出朝向回忆中的序列依赖和反主轴偏差源于对层次复合特征的记忆吸引，而非单一朝向，并通过定量模型验证了这一机制。
中文摘要 AI 辅助
在回忆近期刺激的朝向时，观察者会系统地偏离主轴方向。现有的解释认为，这种“反主轴偏差”的产生是因为主轴朝向以更多的神经资源进行编码，因此噪声更小，这与对环境常见特征的高效编码一致。在这一解释下，偏差应独立地发生在每个刺激上；任何对先前所见朝向的序列吸引都应独立于绝对朝向。相反，我们发现朝向回忆中的序列效应异常强烈，并反映了一种迄今未被识别的层次交互作用，这与大脑感觉处理层级间的循环连接一致。我们发现，视觉朝向回忆中的序列依赖并非主要由对先前朝向本身的吸引主导，而是由一种复合特征主导，该特征同时代表一个倾斜及其关于主轴的镜像反射。与更高层级更大的空间抽象一致，这种复合特征的影响跨视觉中线持续存在，而朝向特异性效应在半球间减弱。我们开发了一个定量模型，基于当前刺激的噪声表示与包含这些复合特征的层次记忆痕迹的最优组合。值得注意的是，尽管编码保真度在各角度间均匀，该模型不仅准确再现了序列依赖，还再现了反主轴偏差。我们的结果表明，记忆痕迹并非局限于单一特征，而是反映了层次表征的复合再激活。此外，它们揭示了跨层次表征的推断可以产生先前归因于编码约束的系统性知觉扭曲。
英文摘要
When recalling the orientation of recent stimuli, observers are systematically biased away from the cardinal axes. The prevailing explanation is that this ''anti-cardinal bias'' arises because cardinal orientations are encoded with greater neural resources and therefore less noise, consistent with efficient coding of environmentally common features. Under this account, the bias should occur independently for each stimulus; any serial attraction towards previously seen orientations should be independent of absolute orientation. By contrast, we find that serial effects in orientation recall are unexpectedly strong and reflect a hitherto unrecognised hierarchical interaction, consistent with recurrent connectivity across hierarchies of sensory processing in the brain. We found that serial dependence in visual orientation recall is dominated not by attraction to the previous orientation itself, but to a compound feature representing both a tilt and its mirror reflection about the cardinal axes. Consistent with greater spatial abstraction at higher levels, the influence of this compound feature persisted across the visual midline, whereas orientation-specific effects weakened between hemifields. We developed a quantitative model based on the optimal combination of a noisy representation of the current stimulus with a hierarchical memory trace incorporating these compound features. Remarkably, although the coding fidelity was uniform across angles, this model accurately reproduced not only the serial dependence, but also the anti-cardinal bias. Our results suggest that memory traces are not isolated to single features, but reflect compound reactivation of hierarchical representations. Furthermore, they reveal that inference across hierarchical representations can generate systematic perceptual distortions previously ascribed to coding constraints.
发表机构
- University College London（伦敦大学学院）
机构由 AI 辅助整理，请以论文原文为准。
