Letter Posting and Orientation Matching: Two Equivalent Tasks in Action and Perception?
Letter Posting and Orientation Matching: Two Equivalent Tasks in Action and Perception?
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DOI：
10.1163/187847511x570105
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发表时间：
2011-01-01
影响因子：
--
通讯作者：
Schenk, Thomas
中科院分区：
文献类型：
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作者：
Hesse, Constanze;Franz, Volker H.;Schenk, Thomas
一名视觉形式失认症（DF）患者在视觉字母张贴任务和知觉定向匹配任务中的表现水平不同，这一发现被认为是知觉动作模型的一部分证据（米尔纳和古德尔，1995）。在这项研究中，我们研究了这些发现的另一种解释。我们专门测试了是否可以使用不同的策略来完成方向匹配和信件投递。16名神经系统完整的参与者被要求将不同大小的卡片放入特定方向的目标插槽中，或者简单地指示插槽的方向。信张贴进行了三种不同的条件下，不同的视觉反馈量。结果表明，部分被试在张贴任务中采用了避障策略。也就是说，他们将卡片定向，使得目标边缘和卡片边缘之间的安全裕度增加。这种趋势随着卡片尺寸的增加而变得更强。相比之下，在方向匹配任务中，卡的端部方向不受其尺寸的影响，并且更接近插槽的实际方向。研究结果表明，张贴和匹配可以解决使用不同的视觉空间信息。因此，DF中这些任务报告的感知动作解离可能仅仅表明计算视觉方向的困难，这种能力是成功的方向匹配所需的，但不是发布。(C)Koninklijke Brill NV，莱顿，2011年
The finding that ill a patient with visual form agnosia (DF), the performance level varies in a visuomotor letter-posting task and a perceptual orientation matching task was considered as part of the evidence for the perception action model (Milner and Goodale, 1995). In this study we examined an alternative interpretation of these findings. We specifically tested whether orientation matching and letter posting can be accomplished using different strategies. Sixteen neurologically intact participants were asked to either put cards of different sizes through a target slot of a certain orientation or to simply indicate the slot's orientation. Letter-posting was performed in three different conditions varying the amount of visual feedback available. Results show that some participants apply a strategy of obstacle-avoidance in the posting task. That is, they oriented the card such that the safety margin between the edges of the target and the card was increased. This tendency became stronger with increasing card size. In contrast, in the orientation matching task, the end-orientation of the card was unaffected by its size and closer to the slot's actual orientation. The findings suggest that posting and matching can be solved using different visuo-spatial information. The perception action dissociation reported for these tasks in DF might therefore simply indicate a difficulty in computing visual orientation, an ability that is needed for successful orientation matching but not for posting. (C) Koninklijke Brill NV, Leiden, 2011