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It's not all about looks: The role of object shape in parietal representations of manual tools
Cortex ( IF 3.6 ) Pub Date : 2020-10-07 , DOI: 10.1016/j.cortex.2020.09.016
Karla Matić 1 , Hans Op de Beeck 2 , Stefania Bracci 3
Affiliation  

The ability to build and expertly manipulate manual tools sets humans apart from other animals. Watching images of manual tools has been shown to elicit a distinct pattern of neural activity in a network of parietal areas, assumingly because tools entail a potential for action—a unique feature related to their functional use and not shared with other manipulable objects. However, a question has been raised whether this selectivity reflects a processing of low-level visual properties—such as elongated shape that is idiosyncratic to most tool-objects—rather than action-specific features. To address this question, we created and behaviourally validated a stimulus set that dissociates objects that are manipulable and nonmanipulable, as well as objects with different degrees of body extension property (tools and non-tools), while controlling for object shape and low-level image properties. We tested the encoding of action-related features by investigating neural representations in two parietal regions of interest (intraparietal sulcus and superior parietal lobule) using functional MRI. Univariate differences between tools and non-tools were not observed when controlling for visual properties, but strong evidence for the action account was nevertheless revealed when using a multivariate approach. Overall, this study provides further evidence that the representational content in the dorsal visual stream reflects encoding of action-specific properties.



中文翻译:

不仅仅是外观:对象形状在手动工具的局部表示中的作用

建立和熟练操作手动工具的能力使人类与其他动物区分开来。观察到观看手动工具的图像可显示出在顶叶区域网络中神经活动的独特模式,这可能是因为工具具有动作的潜能-与其功能使用相关的独特功能,并不与其他可操作对象共享。但是,已经提出了一个问题,即这种选择性是否反映了对低级视觉属性(例如,对于大多数工具对象而言是特质的细长形状)而不是特定于动作的特征的处理。为了解决这个问题,我们创建并通过行为验证了一套刺激集,该刺激集将可操作和不可操作的对象以及具有不同程度的身体伸展特性的对象(工具和非工具)分离开来,同时控制对象形状和低级图像属性。我们通过使用功能性MRI研究两个感兴趣的顶叶区域(腹腔沟和顶叶小叶)中的神经表征来测试动作相关特征的编码。当控制视觉属性时,未观察到工具与非工具之间的单变量差异,但是,当使用多变量方法时,仍然可以找到有关动作说明的有力证据。总体而言,这项研究提供了进一步的证据,表明背侧视觉流中的代表性内容反映了特定于动作的属性的编码。我们通过使用功能性MRI研究两个感兴趣的顶叶区域(腹腔沟和顶叶小叶)中的神经表征来测试动作相关特征的编码。当控制视觉属性时,未观察到工具与非工具之间的单变量差异,但是,当使用多变量方法时,仍然可以找到有关动作说明的有力证据。总体而言,这项研究提供了进一步的证据,表明背侧视觉流中的代表性内容反映了特定于动作的属性的编码。我们通过使用功能性MRI研究两个感兴趣的顶叶区域(腹腔沟和顶叶小叶)中的神经表征来测试动作相关特征的编码。当控制视觉属性时,未观察到工具与非工具之间的单变量差异,但是,当使用多变量方法时,仍然可以找到有关动作说明的有力证据。总体而言,这项研究提供了进一步的证据,表明背侧视觉流中的代表性内容反映了特定于动作的属性的编码。

更新日期:2020-11-12
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