CAJ | 학술논문

为了明确视觉系统对一阶运动和二阶运动识别机制之间的相瓦关系,采用一阶运动和二阶运动的正弦光栅刺激,在旁中央凹对训练组(14名被试)进行运动方向辨别的知觉学习训练.通过比较训练前后的对比敏感度变化,并同对照组(11名被试)的结果比较后发现:a.在旁中央凹,一阶运动光栅方向辨别的训I练提高了被试辨别一阶运动方向的能力,但是这种提高的效果却不能传递到二阶运动光栅的方向辨别任务当中:b.二阶运动光栅方向辨别的训练在提高被试二阶运动方向识别能力的同时,也提高了被试在一阶运动光栅方向辨别任务中的表现.这一训练效果的"非对称"传递现象提示,人的视觉系统中存在两种不同的机制分别用于感知一阶运动和二阶运动,但这两种机制并非截然不同,而是部分分离的.
위료명학시각계통대일계운동화이계운동식별궤제지간적상와관계,채용일계운동화이계운동적정현광책자격,재방중앙요대훈련조(14명피시)진행운동방향변별적지각학습훈련.통과비교훈련전후적대비민감도변화,병동대조조(11명피시)적결과비교후발현:a.재방중앙요,일계운동광책방향변별적훈I련제고료피시변별일계운동방향적능력,단시저충제고적효과각불능전체도이계운동광책적방향변별임무당중:b.이계운동광책방향변별적훈련재제고피시이계운동방향식별능력적동시,야제고료피시재일계운동광책방향변별임무중적표현.저일훈련효과적"비대칭"전체현상제시,인적시각계통중존재량충불동적궤제분별용우감지일계운동화이계운동,단저량충궤제병비절연불동,이시부분분리적.
In order to investigate the interactions between first- and second-order motion perception systems, 14 adult subjects with normal or correct to normal visual acuity were recruited and divided into two groups. Then these two groups were trained, in their parafovea, to discriminate the direction of first- and second-order motion gratings respectively. The spatial frequency of the gratings used in study was fixed at 2 cycles/degree and the temporal frequency was fixed at 8 Hz during training. Contrast sensitivity of subjects in these two training groups for first- and second- order motion was measured before and after 7 days' training to estimate the effects of training. In addition, the differences between the two training groups(14 subjects) and another control group (11 subjects) were studied. The results showed that: 1) the training with first-order motion gratings can improve subjects' performance in first-order motion direction discrimination but the improvement can't be transferred to the performance in second-order motion task; 2) the training with second-order motion gratings can improve subjects' performance in both first- and second-order motion direction discrimination tasks. In conclusion, an " asymmetric transfer" occurred between the training effect of first- and second-order motion gratings. These results indicate that there are two mechanisms for perceiving first- and second-order motion respectively. However, they are not completely different from each other but only partly separated.