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首页> 外文期刊>The European Journal of Neuroscience >Functional consequences of experience-dependent plasticity on tactile perception following perceptual learning
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Functional consequences of experience-dependent plasticity on tactile perception following perceptual learning

机译：知觉学习后经验依赖可塑性对触觉感知的功能后果

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Continuous training enhances perceptual discrimination and promotes neural changes in areas encoding the experienced stimuli. This type of experience-dependent plasticity has been demonstrated in several sensory and motor systems. Particularly, non-human primates trained to detect consecutive tactile bar indentations across multiple digits showed expanded excitatory receptive fields (RFs) in somatosensory cortex. However, the perceptual implications of these anatomical changes remain undetermined. Here, we trained human participants for 9 days on a tactile task that promoted expansion of multi-digit RFs. Participants were required to detect consecutive indentations of bar stimuli spanning multiple digits. Throughout the training regime we tracked participants' discrimination thresholds on spatial (grating orientation) and temporal tasks on the trained and untrained hands in separate sessions. We hypothesized that training on the multi-digit task would decrease perceptual thresholds on tasks that require stimulus processing across multiple digits, while also increasing thresholds on tasks requiring discrimination on single digits. We observed an increase in orientation thresholds on a single digit. Importantly, this effect was selective for the stimulus orientation and hand used during multi-digit training. We also found that temporal acuity between digits improved across trained digits, suggesting that discriminating the temporal order of multi-digit stimuli can transfer to temporal discrimination of other tactile stimuli. These results suggest that experience-dependent plasticity following perceptual learning improves and interferes with tactile abilities in manners predictive of the task and stimulus features used during training.
机译：持续训练会增强感知辨别力，并促进编码受过刺激的区域的神经变化。这种依赖于经验的可塑性已经在几种感觉和运动系统中得到了证明。尤其是，受过训练以检测跨多个手指的连续触觉棒压痕的非人类灵长类动物，在体感皮层中显示出扩大的兴奋性感受野（RF）。然而，这些解剖学改变的知觉意义仍未确定。在这里，我们为人类参与者培训了9天的触觉任务，以促进多位数RF的扩展。要求参与者检测跨越多个数字的连续杠铃压痕。在整个培训过程中，我们分别跟踪了参与者在受过训练和未经训练的手上的空间（光栅方向）和时间任务的辨别阈值。我们假设对多位数任务的培训将降低需要跨多个数位进行刺激处理的任务的感知阈值，同时还会增加需要区分一位数的任务的阈值。我们观察到定向阈值增加了一位数。重要的是，这种效果对于多指训练中的刺激方向和手部具有选择性。我们还发现，经过训练的手指之间的手指之间的时间敏锐度得到了提高，这表明辨别多手指刺激的时间顺序可以转移到其他触觉刺激的时间辨别上。这些结果表明，知觉学习后经验依赖的可塑性以预测训练过程中使用的任务和刺激特征的方式改善并干扰了触觉能力。

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