Fahle M, Skrandies W
Department of Neuro-Ophthalmology, University Eye Hospital, Tübingen, Germany.
Ger J Ophthalmol. 1994 Nov;3(6):427-32.
We investigated learning in a motion-detection task using both psychophysical and neurophysiological methods in normal humans. A total of 20 naive observers had to discriminate between a small motion to the left versus to the right (jump displacement) or between a motion upward versus downward. Their performance improved significantly within less than 30 min in discriminating between directions in the psychophysical jump-displacement task. The improvement of performance with practice was very specific and did not transfer to the same stimulus rotated by 90 degrees. After training for the same task, multichannel evoked-potential recordings changed significantly in component latency and in the distribution of field potentials. This indicates that neuronal ensembles rather than single cells are involved in perceptual learning. Significant differences between the potential distributions occur for potentials at latencies of less than 100 ms over the occipital pole, suggesting an involvement of and plasticity in the primary visual cortex of human adults.
我们运用心理物理学和神经生理学方法，对正常人类在运动检测任务中的学习情况进行了研究。共有20名未经过训练的观察者，需要辨别向左还是向右的微小运动（跳跃位移），或者向上与向下的运动。在心理物理学跳跃位移任务中，他们在不到30分钟的时间内，辨别方向的能力就有了显著提高。通过练习，表现的提升非常具有特异性，并不会迁移到旋转90度的相同刺激上。在对相同任务进行训练后，多通道诱发电位记录在成分潜伏期和场电位分布上发生了显著变化。这表明参与感知学习的是神经元集合而非单个细胞。在枕极上方潜伏期小于100毫秒的电位，其电位分布存在显著差异，这表明人类成年人的初级视觉皮层参与其中且具有可塑性。
