|Alternative Title||On characteristics and occurrence laws of exposure-based visual perceptual learning|
In human cognitive activities, most of the input information is processed non-consciously. Perceptual learning (PL) is one of the most effective methods to enhance the processing of input sensory information. Perceptual learning typically focused on conscious information and active task and little is known about perceptual learning of non-conscious information processing. In the present study, we adopted a different-task of same-stimuli paradigm (DTSS), in which subjects were trained to discriminate one feature of a specifically-defined stimulus while ignoring all other task-irrelevant features, to systematically investigate the characteristics and rule of exposure-based perceptual learning (EBPL), aiming to broaden and deepen the understanding of perceptual learning.
Study I explored the effects of task-irrelevant features’ strength on global motion direction and global orientation discrimination learning. The experimental results showed that both the learning rate and magnitude of both tasks were not affected by strengths of task-irrelevant features, inconsistent with previous findings. In addition, exposure-based global orientation learning occurred after active motion direction training, which effect was also independent of the coherence levels of task-irrelevant features. However, exposure-based global motion direction learning was absent after intensive global orientation training under all exposure configurations. These results suggested that EBPL might involve different plasticity from active and conscious learning.
The purpose of study II was to further explore the characteristics of EBPL, covering the occurring requirements, inter-ocular specificity, retention of learning effect. We found that the occurrence of exposure-based global orientation learning was related to the task-irrelevant orientation configuration when having active global motion direction learning; the learning effect was similar between monocular and binocular training condition and can retain for at least 45 days. Similar to previou findings, exposure-based global motion learning did not happen after orientation discrimination training, no matter subjects were trained monocularly or binocularly.
Study III aimed to investigate the universality of EBPL in other features, including contrast, global orientation, motion direction, and motion speed. The experimental results showed that after training on features such as contrast, orientation and motion speed, performance improved on exposed features except for motion direction. By contrast, after motion direction learning, discrimination performances of all exposed features improved. These results indicated that motion direction might be a unique feature in EBPL. Moreover, the learning effect in EBPL was still lower than that induced by active perceptual learning, demonstrating limitation of EBPL in improving perceptual sensitivity.
Based on the above findings findings, the present study revealed both similar (e.g. longlasting, interocular transfer) and different (e.g. irrespective of exposed performance, not available for all features) plasticity characteristics of exposure-based perceptual learning. On the other hand, active training was still more effective in enhancing performance, showing the merits of attention and consciousness. The findings of active learning and exposure-based learning observed in the present study validated and extended the dual plasticity model and deepened the understanding of perceptual learning.
|Keyword||知觉学习 暴露 迁移性 特异性 非意识础心理学|
|Place of Conferral||中国科学院心理研究所|
|何 勍. 基于暴露视知觉学习的特性及发生规律[D]. 中国科学院心理研究所. 中国科学院大学,2019.|
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