School of Psychological Sciences and Sagol School of Neuroscience, Tel Aviv University, Tel Aviv 69978, Israel.
Department of Neurobiology, Weizmann Institute of Science, Rehovot 76100, Israel.
Sci Rep. 2016 Dec 16;6:38819. doi: 10.1038/srep38819.
Perceptual learning refers to improvement in perception thresholds with practice, however, extended training sessions show reduced performance during training, interfering with learning. These effects were taken to indicate a tight link between sensory adaptation and learning. Here we show a dissociation between adaptation and consolidated learning. Participants trained with a texture discrimination task, in which visual processing time is limited by a temporal target-to-mask window defined as the Stimulus-Onset-Asynchrony (SOA). An initial training phase, previously shown to produce efficient learning, was followed by training structures with varying numbers of SOAs. Largest interference with learning was found in structures containing the largest SOA density, when SOA was gradually decreased. When SOAs were largely kept unchanged, learning was effective. All training structures yielded the same within-session performance reduction, as expected from sensory adaptation. The results point to a dissociation between within-day effects, which depend on the number of trials per se regardless of their temporal structure, and consolidation effects observed on the following day, which were mediated by the temporal structure of practice. These results add a new dimension to consolidation in perceptual learning, suggesting that the degree of its effectiveness depends on variations in temporal properties of the visual stimuli.
感知学习是指通过练习提高感知阈值,然而,长时间的训练课程会在训练过程中降低表现,从而干扰学习。这些效应表明感觉适应和学习之间存在紧密联系。在这里,我们显示了适应和巩固学习之间的分离。参与者接受纹理辨别任务的训练,在该任务中,视觉处理时间受到定义为刺激起始掩蔽窗口(SOA)的时间目标到掩蔽窗口的限制。先前显示出有效学习的初始训练阶段之后,是具有不同 SOA 数量的训练结构。当 SOA 逐渐减少时,在包含最大 SOA 密度的结构中发现了与学习最大的干扰。当 SOA 基本保持不变时,学习是有效的。所有的训练结构都产生了相同的会话内性能降低,这与感觉适应是一致的。研究结果表明,在一天内的影响之间存在分离,这些影响取决于试验本身的数量,而与它们的时间结构无关,而在第二天观察到的巩固影响则由实践的时间结构介导。这些结果为感知学习中的巩固增加了一个新的维度,表明其有效性的程度取决于视觉刺激的时间特性的变化。