PDF(Pubmed)
Abstract：
To dissociate aftereffects of size and density in the perception of relative numerosity, large or small adapter sizes were crossed with high or low adapter densities. A total of 48 participants were included in this preregistered design. To adapt the same retinotopic region as the large adapters, the small adapters were flashed in a sequence so as to \"paint\" the adapting density across the large region. Perceived numerosities and sizes in the adapted region were then compared to those in an unadapted region in separate blocks of trials, so that changes in density could be inferred. These density changes were found to be bidirectional and roughly symmetric, whereas the aftereffects of size and number were not symmetric. A simple account of these findings is that local adaptations to retinotopic density as well as global adaptations to size combine in producing numerosity aftereffects measured by assessing perceived relative number. Accounts based on number adaptation are contraindicated, in particular, by the result of adapting to a large, sparse adapter and testing with a stimulus with a double the density but half number of dots.
摘要：
为了在相对数量的感知中分离大小和密度的后效应，大或小的适配器尺寸与高或低的适配器密度交叉。共有48名参与者被包括在这个预先注册的设计中。为了适应与大型适配器相同的视网膜区域，小适配器按顺序闪烁，以便“绘制”整个大区域的适应密度。然后将适应区域中的感知到的数量和大小与未适应区域中的不同试验进行比较，这样就可以推断密度的变化。发现这些密度变化是双向的，大致对称的，而大小和数量的后效应是不对称的。对这些发现的一个简单解释是，对视网膜密度的局部适应以及对尺寸的全局适应结合在一起，产生了通过评估所感知的相对数来衡量的数字后效。基于数量适应的账户是禁忌的，特别是,由于适应了一个大的，稀疏适配器，并使用密度两倍但点数一半的刺激进行测试。
