Center for Mind/Brain Sciences, University of Trento, Via Delle Regole 101, 38123, Mattarello, TN, Italy.
Department of Psychology and Cognitive Science, University of Trento, Corso Bettini 84, 38068, Rovereto, TN, Italy.
Brain Struct Funct. 2019 Dec;224(9):3291-3308. doi: 10.1007/s00429-019-01970-1. Epub 2019 Oct 31.
Predictions of upcoming movements are based on several types of neural signals that span the visual, somatosensory, motor and cognitive system. Thus far, pre-movement signals have been investigated while participants viewed the object to be acted upon. Here, we studied the contribution of information other than vision to the classification of preparatory signals for action, even in the absence of online visual information. We used functional magnetic resonance imaging (fMRI) and multivoxel pattern analysis (MVPA) to test whether the neural signals evoked by visual, memory-based and somato-motor information can be reliably used to predict upcoming actions in areas of the dorsal and ventral visual stream during the preparatory phase preceding the action, while participants were lying still. Nineteen human participants (nine women) performed one of two actions towards an object with their eyes open or closed. Despite the well-known role of ventral stream areas in visual recognition tasks and the specialization of dorsal stream areas in somato-motor processes, we decoded action intention in areas of both streams based on visual, memory-based and somato-motor signals. Interestingly, we could reliably decode action intention in absence of visual information based on neural activity evoked when visual information was available and vice versa. Our results show a similar visual, memory and somato-motor representation of action planning in dorsal and ventral visual stream areas that allows predicting action intention across domains, regardless of the availability of visual information.
对即将发生的运动的预测基于跨越视觉、躯体感觉、运动和认知系统的几种类型的神经信号。到目前为止,已经在参与者观察要作用的物体时研究了运动前信号。在这里,我们研究了除视觉以外的信息对动作预备信号分类的贡献,即使在没有在线视觉信息的情况下也是如此。我们使用功能磁共振成像(fMRI)和多体素模式分析(MVPA)来测试在预备阶段,当参与者静止不动时,视觉、基于记忆和躯体感觉信息引起的神经信号是否可以可靠地用于预测在动作之前的背侧和腹侧视觉流中的区域中即将发生的动作,而参与者的眼睛是睁开还是闭着。十九名人类参与者(九名女性)睁开或闭着眼睛对物体执行两种动作之一。尽管腹侧流区域在视觉识别任务中起着众所周知的作用,背侧流区域在躯体运动过程中专业化,但我们根据视觉、基于记忆和躯体感觉信号解码了两个流区域中的动作意图。有趣的是,我们可以根据在有视觉信息时引起的神经活动,在没有视觉信息的情况下可靠地解码动作意图,反之亦然。我们的结果表明,背侧和腹侧视觉流区域中的动作规划具有相似的视觉、记忆和躯体感觉表现,允许跨域预测动作意图,而与视觉信息的可用性无关。