Different activation signatures in the primary sensorimotor and higher-level regions for haptic three-dimensional curved surface exploration
Different activation signatures in the primary sensorimotor and higher-level regions for haptic three-dimensional curved surface exploration
复制标题
DOI：
10.1016/j.neuroimage.2021.117754
复制
发表时间：
2021-02-16
期刊：
影响因子：
5.7
通讯作者：
Bandettini, Peter A.
中科院分区：
文献类型：
--
作者：
Yang, Jiajia;Molfese, Peter J.;Bandettini, Peter A.
触觉物体感知始于持续的探索性接触，人类大脑需要随着时间的推移不断积累感官信息。然而，目前还不清楚初级感觉运动皮层（PSC）如何与这些更高级别的区域在触觉探索随着时间的推移相互作用。这项功能性磁共振成像（fMRI）研究通过检查触觉3D曲线和粗糙度估计过程中的大脑活动来研究时间依赖性触觉对象处理。在这个实验中，我们设计了16个触觉刺激（4种曲线× 4种粗糙度）用于触觉曲线和粗糙度估计任务。20名参与者被要求沿着表面移动他们的右手食指和中指沿着两次，并根据任务指令估计两个特征之一-粗糙度或曲率。我们发现，在几个更高级别的区域（例如，双侧后顶叶皮质）在触觉探索阶段期间随着弯曲数量的增加而线性增加。令人惊讶的是，我们发现对侧PSC仅在勘探后期阶段受到曲线数量的参数调制，而在勘探早期阶段则不然。相比之下，我们没有发现类似的参数调制活动模式在触觉粗糙度估计任务中的对侧PSC或更高级别的地区。因此，我们的研究结果表明，触觉3D物体感知处理的皮层层次，而对侧PSC与其他更高级别的地区在整个时间的方式，是依赖于对象的功能。
Haptic object perception begins with continuous exploratory contact, and the human brain needs to accumulate sensory information continuously over time. However, it is still unclear how the primary sensorimotor cortex (PSC) interacts with these higher-level regions during haptic exploration over time. This functional magnetic resonance imaging (fMRI) study investigates time-dependent haptic object processing by examining brain activity during haptic 3D curve and roughness estimations. For this experiment, we designed sixteen haptic stimuli (4 kinds of curves x 4 varieties of roughness) for the haptic curve and roughness estimation tasks. Twenty participants were asked to move their right index and middle fingers along the surface twice and to estimate one of the two features -roughness or curvature -depending on the task instruction. We found that the brain activity in several higher-level regions (e.g., the bilateral posterior parietal cortex) linearly increased as the number of curves increased during the haptic exploration phase. Surprisingly, we found that the contralateral PSC was parametrically modulated by the number of curves only during the late exploration phase but not during the early exploration phase. In contrast, we found no similar parametric modulation activity patterns during the haptic roughness estimation task in either the contralateral PSC or in higher-level regions. Thus, our findings suggest that haptic 3D object perception is processed across the cortical hierarchy, whereas the contralateral PSC interacts with other higher-level regions across time in a manner that is dependent upon the features of the object.